1625-0104 Stat/Authority

CFR-2002-title46-vol5-part151.pdf

Barges Carrying Bulk Hazardous Materials

1625-0104 Stat/Authority

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Pt. 151

46 CFR Ch. I (10–1–01 Edition)
151.04–3 Initial inspection.
151.04–5 Inspection for certification.
151.04–7 Nondestructive testing.

PART 151—BARGES CARRYING
BULK LIQUID HAZARDOUS MATERIAL CARGOES

Subpart 151.05—Summary of Minimum
Requirements for Specific Cargoes

Subpart 151.01—General

151.05–1 Explanation of column headings in
Table 151.05.
151.05–2 Compliance with requirements for
tank barges carrying benzene and benzene containing cargoes, or butyl acrylate cargoes.

Sec.
151.01–1 Applicability.
151.01–2 Incorporation by reference.
151.01–3 [Reserved]
151.01–5 [Reserved]
151.01–10 Application of vessel inspection
regulations.
151.01–15 Dangerous cargoes not specifically
named.
151.01–20 Use of minimum requirements.
151.01–25 Existing barges.
151.01–30 Effective date.
151.01–35 Right of appeal.

TABLE 151.05—SUMMARY OF MINIMUM
REQUIREMENTS

Subpart 151.10—Barge Hull Construction
Requirements
151.10–1 Barge hull classifications.
151.10–5 Subdivision and stability.
151.10–15 Certificate endorsement.
151.10–20 Hull construction.

Subpart 151.02—Equivalents
151.02–1 Conditions under which equivalents
may be used.
151.02–5 Design of unmanned barges.

Subpart 151.12—Equipment and Operating
Requirements for Control of Pollution
From Category D NLS Cargoes

Subpart 151.03—Definitions
151.03–1 Definitions of terms.
151.03–3 Angle of downflooding.
151.03–5 Approved.
151.03–7 Barge.
151.03–9 Cargo.
151.03–11 Coastwise.
151.03–13 Cofferdam.
151.03–15 Commandant.
151.03–17 Compatible.
151.03–19 Environment.
151.03–21 Filling density.
151.03–23 Flame arrestor.
151.03–25 Flame screen.
151.03–27 Gas free.
151.03–29 Great Lakes.
151.03–30 Hazardous material.
151.03–31 Headquarters.
151.03–33 Lakes, bays, and sounds.
151.03–35 Limiting draft.
151.03–36 Liquid.
151.03–37 Maximum allowable working pressure.
151.03–38 Nondestructive testing.
151.03–39 Ocean.
151.03–41 Officer in Charge, Marine Inspection (OCMI).
151.03–43 Pressure.
151.03–45 Rivers.
151.03–47 Service.
151.03–49 Sounding tube.
151.03–51 Tank barge.
151.03–53 Tankerman.
151.03–55 [Reserved]

151.12–5 Equipment for Category D NLS.
151.12–10 Operation of oceangoing non-selfpropelled ships carrying Category D
NLS.

Subpart 151.13—Cargo Segregation
151.13–1 General.
151.13–5 Cargo segregation—tanks.

Subpart 151.15—Tanks
151.15–1
151.15–3
151.15–5
151.15–6
151.15–10

Tank types.
Construction.
Venting.
Venting piping.
Cargo gauging devices.

Subpart 151.20—Cargo Transfer
151.20–1
151.20–5
151.20–10
151.20–15
151.20–20

Piping—general.
Cargo system valving requirements.
Cargo system instrumentation.
Cargo hose if carried on the barge.
Cargo transfer methods.

Subpart 151.25—Environmental Control
151.25–1 Cargo tank.
151.25–2 Cargo handling space.

Subpart 151.30—Portable Fire Extinguishers
151.30–1

Subpart 151.04—Inspection and
Certification

Type.

Subpart 151.40—Temperature or Pressure
Control Installations

151.04–1 Certificate of inspection.
151.04–2 Inspection required.

151.40–1 Definitions.
151.40–2 Materials.

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§ 151.01–2

151.40–5 Construction.
151.40–10 Operational requirements.
151.40–11 Refrigeration systems.

Subpart 151.58—Required Materials of
Construction
151.58–1

Subpart 151.45—Operations
151.45–1
151.45–2
151.45–3
151.45–4
151.45–5
151.45–6
151.45–7
151.45–8
151.45–9

Required materials.

AUTHORITY: 33 U.S.C. 1903; 46 U.S.C. 3703; 49
CFR 1.46.

General.
Special operating requirements.
Manning.
Cargo-handling.
Open hopper barges.
Maximum amount of cargo.
Shipping papers.
Illness, alcohol, drugs.
Signals.

SOURCE: CGFR 70–10, 35 FR 3714, Feb. 25,
1970, unless otherwise noted.
EDITORIAL NOTE: Nomenclature changes for
part 151 appear at CGD 88–100, 54 FR 40029,
Sept. 29, 1989.

Subpart 151.01—General

Subpart 151.50—Special Requirements
§ 151.01–1

151.50–1 General.
151.50–5 Cargoes having toxic properties.
151.50–6 Motor fuel antiknock compounds.
151.50–10 Alkylene oxides.
151.50–12 Ethylene oxide.
151.50–13 Propylene oxide.
151.50–20 Inorganic acids.
151.50–21 Sulfuric acid.
151.50–22 Hydrochloric acid.
151.50–23 Phosphoric acid.
151.50–30 Compressed gases.
151.50–31 Chlorine.
151.50–32 Ammonia, anhydrous.
151.50–34 Vinyl chloride (vinyl chloride
monomer).
151.50–36 Argon or nitrogen.
151.50–40 Additional requirements for carbon disulfide (carbon bisulfide) and ethyl
ether.
151.50–41 Carbon disulfide (carbon bisulfide).
151.50–42 Ethyl ether.
151.50–50 Elemental phosphorus in water.
151.50–55 Sulfur (molten).
151.50–60 Benzene.
151.50–70 Cargoes requiring inhibition or
stabilization.
151.50–73 Chemical protective clothing.
151.50–74 Ethylidene norbornene.
151.50–75 Ferric chloride solution.
151.50–76 Hydrochloric acid, spent (NTE
15%).
151.50–77 Fluorosilicic acid (30% or less)
(hydrofluorosilicic acid).
151.50–79 Methyl acetylene-propadiene mixture.
151.50–80 Nitric acid (70% or less).
151.50–81 Special operating requirements for
heat sensitive cargoes.
151.50–84 Sulfur dioxide.
151.50–86 Alkyl (C7–C9) nitrates.

[CGD 81–101, 52 FR 7776, Mar. 12, 1987, as
amended by CGD 84–043, 55 FR 37413, Sept. 11,
1990]

§ 151.01–2

General.

Subpart 151.56—Prohibited Materials of
Construction
151.56–1

Incorporation by reference.

(a) Certain standards and specifications are incorporated by reference
into this part with the approval of the
Director of the Federal Register in accordance with 5 U.S.C. 552(a). To enforce any edition other than the ones
listed in paragraph (b) of this section,
notice of change must be published in
the FEDERAL REGISTER and the material made available to the public. All
approved material is on file at the Office of the Federal Register, 800 North
Capitol Street, NW., suite 700, Washington, DC, and is available from the
sources indicated in paragraph (b) of
this section.

Subpart 151.55—Special Requirements for
Materials of Construction
151.55–1

Applicability.

This part applies to the following:
(a) Oceangoing, as defined in 33 CFR
151.05(j),
non-self-propelled
United
States ships and non-self-propelled foreign ships operating in United States
waters that carry a bulk cargo that
is—
(1) Listed in Table 151.05;
(2) Not being carried in a portable
tank regulated under subpart 98.30 or
98.33 of this chapter; and
(3) Not an NLS or is an NLS cargo
that is a Category D listed in § 151.12–5
of this part.
(b) All non-self-propelled United
States ships that are not oceangoing
that carry a bulk cargo that is—
(1) Listed in Table 151.05, and
(2) Not being carried in a portable
tank regulated under subpart 98.30 or
98.33 of this chapter.

Prohibited materials.

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§ 151.01–3

46 CFR Ch. I (10–1–01 Edition)
subchapter D (Tank Vessels) of this
chapter and the regulations in this
part.
(c) Every unmanned tank barge prior
to the carriage in bulk of any liquid or
liquefied gas listed in Table 151.05
which does not have the flammability
or combustibility characteristics as indicated by the fire protection requirement in Table 151.05 shall be inspected
and certificated under the applicable
provisions of subchapter D or subchapter I of this chapter, at the option
of the barge owner, in addition to the
regulations in this part. However, unless the barge owner notifies the Officer in Charge, Marine Inspection of his
option to have the barge inspected and
certificated under subchapter I at the
time he submits the application for inspection (Form CG–3752), the unmanned tank barge shall be inspected
and certificated under the provisions of
subchapter D of this chapter and the
regulations in this part.
(c–1) Each unmanned tank barge constructed on or after September 6, 1977,
that carries in bulk a cargo listed in
Table 151.05 and that is certificated
under subchapter I of this chapter
must meet the loading information requirements in § 31.10–32 of this chapter.
(d) The provisions of subchapter D of
this chapter shall apply to all unmanned tank barges which carry in
bulk any of the liquids or liquefied
gases listed in Table 30.25–1 of this
chapter. The provisions of this part
shall not apply to such barges unless it
is also desired to carry one or more of
the liquids or liquefied gases listed in
Table 151.05.
(e) Manned barges which carry or intend to carry in bulk the cargoes specified in Table 151.05 will be considered
individually by the Commandant and
may be required to meet the requirements of this subchapter and of subchapter D (Tank Vessels) or I (Cargo
and Miscellaneous Vessels) of this
chapter as applicable.

(b) The standards and specifications
approved for incorporation by reference in this part and the sections affected, are:
American Society for Nondestructive Testing
(ASNT)
4153 Arlingate Road, Caller num;28518, Columbus, OH 43228–0518
ASNT ‘‘Recommended Practice No.
SNT–TC–1A (1988), Personnel Qualification and Certification in Nondestructive Testing’’ .............151.04–7(c)(2)
American Society of Mechanical Engineers
(ASME) International
Three Park Avenue, New York, NY 10016–5990
ASME Boiler and Pressure Vessel
Code Section V, Nondestructive
Examination (1986) ................151.04–7(a)(1)
American Society for Testing and Materials
(ASTM)
100 Barr Harbor Drive, West Conshohocken,
PA 19428–2959.
ASTM D 4986–98, Standard Test Method for Horizontal Burning Characteristics of Cellular Polymeric Materials............................................151.15–3
ASTM E 84–98, Standard Test Method
for Surface Burning Characteristics of Building Materials—151.15–3
[CGD 85–061, 54 FR 50965, Dec. 11, 1989, as
amended by USCG–1999–6216, 64 FR 53227, Oct.
1, 1999; USCG–1999–5151, 64 FR 67183, Dec. 1,
1999]

§ 151.01–3

[Reserved]

§ 151.01–5

[Reserved]

§ 151.01–10 Application of vessel inspection regulations.
(a) The regulations in this part are
requirements which may be in addition
to, supplement, or modify requirements in other subchapters in this
chapter. When a specific requirement
in another part or section in another
subchapter in this chapter is in conflict
with or contrary to requirement or intent expressed in this part, the regulations in this part shall take precedence.
(b) Every unmanned tank barge
which carries or is intended to carry in
bulk any liquid or liquefied gas listed
in Table 151.05 and has flammability or
combustibility characteristics as indicated by a fire protection requirement
in Table 151.05 shall be inspected and
certificated under the provisions in

[CGFR 70–10, 35 FR 3714, Feb. 25, 1970]
EDITORIAL NOTE: For Federal Register citations affecting § 151.01–10, see the List of CFR
Sections Affected, which appears in the
Finding Aids section of the printed volume
and on GPO Access.

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§ 151.01–35
(2) All other requirements shall be
met within a 2–year period subsequent
to the effective date.
(b) If an existing barge, which has
been designed to carry or has regularly
been carrying one or more of the cargoes regulated by this subchapter, is
found to be so arranged, or outfitted
that conversion to bring it into compliance with any or all of the requirements of this subchapter is impractical
or impossible, the Commandant, upon
application, may review the plans of
the barge to determine if it is suitable
and safe for the cargoes to be transported.
(c) Except for operating and vinyl
chloride requirements, barges constructed and certificated for the transportation of any cargo for which specific regulations existed, in parts 36, 38,
39, 40, and 98 of this chapter at the time
of their construction or conversion,
may continue and will be certificated
to operate without the requirement
that they comply with the provisions
of subchapter O of this chapter.

§ 151.01–15 Dangerous cargoes not specifically named.
(a) Any liquid or liquefied gas, which
meets the definitions referred to in
§ 151.01–1 and is not named in Table
151.05 or Table 30.25–1 of this chapter
shall not be transported in bulk in a
manned or unmanned tank barge without the prior specific approval of the
Commandant.
(b) Mixtures or blends of two or more
cargoes, one or more of which appears
in Table 151.05, will be treated as
though they were new products and
specific approval of the Commandant
must be obtained prior to undertaking
their transportation.
[CGFR–70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 81–101, 52 FR 7777, Mar. 12,
1987; CGD 81–101, 53 FR 28974, Aug. 1, 1988 and
54 FR 12629, Mar. 28, 1989; CGD 88–100, 54 FR
40029, Sept. 29, 1989]

§ 151.01–20
ments.

Use of minimum require-

(a) The minimum requirements governing transportation of any liquid or
liquefied gas listed in Table 151.05 are
set forth in this part when such substances are carried in bulk in unmanned tank barges.
(b) Before any liquid or liquefied gas
listed in Table 151.05 may be carried in
an unmanned tank barge, the certificate of inspection issued to such barge
shall be appropriately endorsed to show
approval to transport such cargo.

[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 74–167k, 40 FR 17026, Apr.
16, 1975]

§ 151.01–30 Effective date.
(a) The regulations in this subchapter are effective on and after June
1, 1970. However, amendments, revisions, or additions shall become effective ninety (90) days after the date of
publication in the FEDERAL REGISTER
unless the Commandant shall fix a different time.
(b) The regulations in this subchapter are not retroactive in effect
unless specifically made so at the time
the regulations are issued. Changes in
specification requirements of articles
of equipment, or materials used in construction of tank barges, shall not
apply to such items which have been
passed as satisfactory until replacement shall become necessary, unless a
specific finding is made that such
equipment or materials used is unsafe
or hazardous and has to be removed
from tank barges.

[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40029, Sept. 29,
1989]

§ 151.01–25

Existing barges.

(a) Except as provided in paragraph
(c) of this section, barges certified for,
or used within the previous 2 years
prior to the effective date of this regulation, or barges equivalent to such
barges, for the transportation of any
cargo regulated by this subchapter
which do not meet the specific requirements herein, may be continued in
service subject to the following conditions:
(1) Venting, gauging, and all operating requirements shall be met within
a 1–year period subsequent to the effective date.

§ 151.01–35 Right of appeal.
Any person directly affected by a decision or action taken under this part,
by or on behalf of the Coast Guard,

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§ 151.02–1

46 CFR Ch. I (10–1–01 Edition)

may appeal therefrom in accordance
with subpart 1.03 of this chapter.

§ 151.03–3

[CGD 88–033, 54 FR 50381, Dec. 6, 1989]

Subpart 151.02—Equivalents
§ 151.02–1 Conditions
under
equivalents may be used.

§ 151.03–5

which

§ 151.03–7

Barge.

This term means any non-self-propelled vessel designed to carry cargo.
§ 151.03–9

Cargo.

This term means any liquid, gas or
solid having one or more of the dangerous properties defined in this subchapter.
§ 151.03–11

Coastwise.

This designation refers to all vessels
normally navigating the waters of any
ocean or the Gulf of Mexico 20 nautical
miles or less offshore.
§ 151.03–13

Cofferdam.

This term means a void or empty
space separating two or more compartments for the purpose of isolation or to
prevent the contents of one compartment from entering another in the
event of the failure of the walls of one
to retain their tightness.
§ 151.03–15

Commandant.

This term means Commandant of the
U.S. Coast Guard.

Design of unmanned barges.

§ 151.03–17

(a) In order not to inhibit design and
application, the Commandant may approve vessels of novel design, both new
and for conversion, after it is shown to
his satisfaction that such a vessel is at
least as safe as any vessel which meets
the standards required by this part.
(b) [Reserved]

Compatible.

Compatible means that a cargo will
not react in an unsafe manner with
other cargo or materials used in construction of the barge. The prime considerations are the chemical, physical,
or thermal properties of the reaction
including heat, pressure, toxicity, stability, and explosive nature of the reaction and its end products.

Subpart 151.03—Definitions
§ 151.03–1

Approved.

This term means approved by the
Commandant unless otherwise stated.

(a) Where in this part it is provided
that a particular fitting, material, appliance, apparatus, or equipment, or
type thereof, shall be fitted or carried
in a vessel, or that any particular provision shall be made or arrangement
including cargo segregation shall be
adopted, the Commandant may accept
in substitution therefor any other fitting, material, apparatus or equipment, or type thereof, or any other
provision or arrangement. However,
the Commandant shall be satisfied by
suitable evidence that the fitting, material, appliance, apparatus, or equipment, or the type thereof, or the provision or arrangement shall be at least as
effective as that specified in this part.
(b) In any case where it is shown to
the satisfaction of the Commandant
that the use of any particular equipment, apparatus, or arrangement not
specifically required by law is unreasonable or impracticable, the Commandant may permit the use of alternate equipment apparatus, or arrangement to such an extent and upon such
conditions as will insure, to his satisfaction, a degree of safety consistent
with the minimum standards set forth
in this part.
§ 151.02–5

Angle of downflooding.

The angle of heel of the vessel at
which any opening in the hull not provided with a water tight closure would
be immersed.

§ 151.03–19

Definitions of terms.

Environment.

This term refers to the atmosphere
within a cargo tank and the spaces adjacent to the tank or spaces in which
cargo is handled.

Certain terms used in the regulations
in this subchapter are defined in this
subpart.

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§ 151.03–21

§ 151.03–41

Filling density.

§ 151.03–33

The ratio, expressed as a percentage,
of the weight of cargo that may be
loaded into a tank compared to the
weight of water that the tank will hold
at 60 °F. The weight of a gallon of
water at 60 °F in air shall be 8.32828
pounds.

Lakes, bays, and sounds.

A designation for all vessels navigating the waters of any of the lakes,
bays, or sounds other than the waters
of the Great Lakes.
§ 151.03–35

Limiting draft.

Any device or assembly of cellular,
tubular, pressure or other type used for
preventing the passage of flames into
enclosed spaces.

Maximum allowable draft to which a
barge may be loaded. Limiting draft is
a function of hull type and cargo specific gravity. A barge may be assigned
different limiting drafts for different
hull types or within one hull type for
different specific gravities.

§ 151.03–25

§ 151.03–36

§ 151.03–23

Flame arrestor.

Flame screen.

A fitted single screen of corrosion-resistant wire of at least 30 by 30 mesh or
two fitted screens, both of corrosion-resistant wire, of at least 20 by 20 mesh
spaced not less than one-half inch or
more than 11⁄2 inches apart.
§ 151.03–27

[CGD 81–101, 52 FR 7777, Mar. 12, 1987]

§ 151.03–37 Maximum allowable working pressure.

Gas free.

The maximum allowable working
pressure shall be as defined in section
VIII of the ASME Boiler and Pressure
Vessel Code.

Free from dangerous concentrations
of flammable or toxic gases.
§ 151.03–29

Liquid.

In this part liquid includes liquefied
and compressed gases.

Great Lakes.

[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 85–061, 54 FR 50965, Dec. 11,
1989]

A designation for all vessels in Great
Lakes service.
§ 151.03–30 Hazardous material.
In this part hazardous material means
a liquid material or substance that is—
(a) Flammable or combustible;
(b) Designated a hazardous substance
under section 311(b) of the Federal
Water Pollution Control Act (33 U.S.C.
1321); or
(c) Designated a hazardous material
under 49 U.S.C. 5103.

§ 151.03–38

Nondestructive testing.

Nondestructive testing includes ultrasonic examination, liquid penetrant
examination, magnetic particle examination,
radiographic
examination,
eddy current, and acoustic emission.
[CGD 85–061, 54 FR 50965, Dec. 11, 1989]

§ 151.03–39

Ocean.

A designation for all vessels normally navigating the waters of any
ocean or the Gulf of Mexico more than
20 nautical miles offshore.

NOTE: The Environmental Protection
Agency designates hazardous substances in
40 CFR Table 116.4A. The Coast Guard designates hazardous materials that are transported as bulk liquids by water in § 153.40.

§ 151.03–41 Officer in Charge, Marine
Inspection (OCMI).

[CGD 81–101, 52 FR 7777, Mar. 12, 1987, as
amended by CGD 95–028, 62 FR 51209, Sept. 30,
1997]

This term means any person from the
civilian or military branch of the Coast
Guard designated as such by the Commandant and who, under the superintendence and direction of the Coast
Guard District Commander, is in
charge of an inspection zone for the
performance of duties with respect to
the enforcement and administration of
Subtitle II of Title 46, U.S. Code, Title

§ 151.03–31 Headquarters.
The Office of the Commandant, U.S.
Coast Guard, Washington, DC 20593–
0001.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–070, 53 FR 34535, Sept. 7,
1988]

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§ 151.03–43

46 CFR Ch. I (10–1–01 Edition)

46 and Title 33 U.S. Code, and regulations issued under these statutes.

§§ 151.03–55

Subpart 151.04—Inspection and
Certification

[CGD 95–028, 62 FR 51209, Sept. 30, 1997]

§ 151.03–43

Pressure.

§ 151.04–1 Certificate of inspection.
(a) A certificate of inspection is required for every unmanned tank barge
subject to the requirements in this subchapter. A certificate of inspection
shall be issued to the barge or to its
owners by the Officer in Charge, Marine Inspection, if the barge is found to
comply with applicable inspection laws
and the regulations in this chapter.
(b) The certificate of inspection shall
be endorsed with respect to the waters
over which the barge may be operated.
(c) The certificate shall be endorsed
describing the cargoes by name as
given in Table 151.05 or as specifically
approved by the Commandant. No
other dangerous cargo as defined in
Subpart 151.01–1 shall be carried. Certificates shall specify maximum cargo
weight (short tons), maximum density
(pounds per gallon) and any operating
limitations and a limiting draft.

Terminology used in this part are:
pounds per square inch gauge (p.s.i.g.)
or pounds per square inch absolute
(p.s.i.a.). 14.7 p.s.i.a. is equal to 0
p.s.i.g. P.s.i.g. is normally used in reference to design or operating requirements.
§ 151.03–45

Rivers.

A designation for all vessels whose
navigation is restricted to rivers and/or
canals, exclusively.
§ 151.03–47

Service.

The waters upon which a vessel may
be operated as endorsed upon the certificate of inspection.
§ 151.03–49

Sounding tube.

This is an unperforated tube fitted to
an ullage hole, secured so as to be
vapor tight to the underside of the
tank top open at the bottom, and extending to within 18 inches or less of
the bottom of the tank.
§ 151.03–51

[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40029, Sept. 29,
1989]

§ 151.04–2 Inspection required.
(a) Every unmanned tank barge subject to the regulations in this subchapter shall be inspected biennially.
More frequent inspections may be required, if necessary, by the Officer in
Charge, Marine Inspection, to see that
the hull, equipment and appliances of
the vessel comply with the marine inspection laws, and the regulations of
this subchapter and other subchapters
where applicable.
(b) [Reserved]

Tank barge.

A non-self-propelled vessel especially
constructed or converted to carry bulk
liquid cargo in tanks.
§ 151.03–53

[Reserved]

Tankerman.

The following ratings are established
in part 13 of this chapter. The terms for
the ratings identify persons holding
valid merchant mariners’ documents
for service in the ratings issued under
that part:
(a) Tankerman-PIC.
(b) Tankerman-PIC (Barge).
(c) Restricted Tankerman-PIC.
(d)
Restricted
Tankerman-PIC
(Barge).
(e) Tankerman-Assistant.
(f) Tankerman-Engineer.

§ 151.04–3 Initial inspection.
(a) The initial inspection which may
consist of a series of inspections during
the construction of an unmanned barge
shall include a complete inspection of
the structure, auxiliary machinery,
and equipment. The inspection shall be
such as to insure that the arrangement, materials, and scantlings of the
hull structure, tanks and pressure vessels and their appurtenances comply
with applicable regulations of this

[CGD 79–116, 60 FR 17157, Apr. 4, 1995]

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§ 151.04–5

chapter and with the requirements of
this part.
(b) [Reserved]

cepted by the marine inspector without
the removal of insulation.
(d) If required by the Officer in
Charge, Marine Inspection the owner
shall conduct nondestructive testing of
each tank designated by the Officer in
Charge, Marine Inspection in accordance with § 151.04–7.
(e) If the Officer in Charge, Marine
Inspection considers a hydrostatic test
necessary to determine the condition
of the tanks, the owner shall perform
the test at a pressure of 11⁄2 times the
tank’s—
(1) Maximum allowable pressure, as
determined by the safety relief valve
setting; or
(2) Design pressure, when cargo tanks
operate at maximum allowable pressures reduced below the design pressure
in order to satisfy special mechanical
stress relief requirements.

§ 151.04–5 Inspection for certification.
(a) An inspection for certification is
a prerequisite of the reissuance of a
Certificate of Inspection as provided
for in applicable regulations of this
chapter.
(b) Unless otherwise specified in
table 151.05, cargo tanks are internally
examined as follows:
(1) Where the cargo tank is of the
gravity type and the structural framing is on the internal tank surface, the
tank shall be inspected internally at
the time of inspection for certification.
(2) Where the cargo tank is of the
gravity type and the structural framing is on the external tank surface accessible for examination from voids,
cofferdams, double bottoms, and other
similar spaces, tanks shall be inspected
internally at 4–year intervals.
(3) If the tank is a pressure-vessel
type cargo tank, an internal inspection
of the tank is conducted within—
(i) Ten years after the last internal
inspection on an unmanned barge carrying cargo at temperatures of ¥67 °F
(¥55 °C) or warmer; or
(ii) Eight years after the last internal
inspection if the tank is a pressure
type cargo tank carrying cargo at temperatures colder than ¥67 °F (¥55 °C).
(4) Internal inspection may be required at more frequent intervals as
deemed necessary by the Officer in
Charge, Marine Inspection.
(c) An external examination of
unlagged tanks and the visible parts of
lagged tanks is made at each biennial
inspection. If the vessel has single skin
construction, the underwater portion
of the tank need not be examined unless deemed necessary by the Officer in
Charge, Marine Inspection. If an external examination of the tank is not possible because of insulation, the owner
shall ensure that—
(1) The amount of insulation deemed
necessary by the marine inspector is
removed during each cargo tank internal inspection to allow spot external
examination of the tanks and insulation; or
(2) The thickness of the tanks is
gauged by a nondestructive means ac-

NOTE: See the ASME Code, Section VIII,
Appendix 3 for information on design pressure.

(f) Quick closing valves shall be tested by operating the emergency shutoff
system from each operating point at
the time of each vessel’s inspection for
certification.
(g) Excess flow valves shall be inspected at the time of inspection for
certification. The Officer in Charge,
Marine Inspection, shall satisfy himself that the valve is in working condition by visual inspection, and if this is
impossible, by one of the following
means:
(1) Removing the valve and bench
testing ashore; the valve shall close at
or below its rated closing flow.
(2) By any other means acceptable to
the Officer in Charge, Marine Inspection, which will demonstrate that the
valve is operable.
(h) Pressure vaccum relief valves
shall be examined to determine that
the operating mechanism is free and
capable of activation.
(i) Safety relief valves shall be tested
by bench testing or other suitable
means. The valves shall relieve and
reseat within the design tolerances of
the set pressure, or it shall be removed
and reset prior to being returned to
service. This test shall be conducted at
the time of the inspection for certification.

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§ 151.04–7

46 CFR Ch. I (10–1–01 Edition)
sults to the Officer in Charge, Marine
Inspection.

(j) Cargo hose stored on board the
vessel which is used in transferring
cargoes listed in Table 151.05 shall be
inspected every 2 years. This inspection shall consist of a visual examination and a hydrostatic test of 11⁄2 times
the maximum pressure to which the
hose will be subjected in service. The
date of the most recent inspection and
the test pressure shall be stenciled or
otherwise marked on the hose.
(k) Cargo piping shall be inspected
and tested at the same time as the
cargo tanks.
(l) If the tank is a pressure vessel
type cargo tank with an internal inspection interval of 10 years, and is 30
years old or older, determined from the
date it was built, the owner shall conduct nondestructive testing of each
tank in accordance with § 151.04–7, during each internal inspection.

[CGD 85–061, 54 FR 50966, Dec. 11, 1989]

Subpart 151.05—Summary of Minimum Requirements for Specific Cargoes
§ 151.05–1 Explanation of column headings in Table 151.05.
(a) Cargo identification/name. This column identifies cargoes by name. Words
in italics are not part of the cargo
name but may be used in addition to
the cargo name. When one entry references another entry by use of the
word ‘‘see’’ and both names are in
roman type, either name may be used
as the cargo name (e.g., ‘‘Diethyl either see Ethyl ether’’). However, the
referenced entry is preferred.
(b) Cargo identification/pressure. This
column identifies cargo in terms of
pressure within the tank. Terms used
are:
(1) Pressurized. Cargo carried at a
pressure in excess of 10 pounds per
square inch gauge as measured at the
top of the tank (i.e., exclusive of static
head).
(2) Atmospheric pressure. Cargo carried
at not more than 10 pounds per square
inch gauge, exclusive of static head.
(c) Cargo identification/temperature.
This column identifies the cargo by the
temperature of the cargo during transit.
(1) Ambient temperature. Cargo which
is carried at naturally occurring temperatures.
(2) Low temperature. Cargo carried
below ambient temperatures when the
product temperature is below 0 °F.
(3) Elevated temperature. Cargo carried
above ambient temperatures.
(d) Hull type. This column refers to
the flotation features of the barge.
Terms used are explained and defined
in Subpart 151.10 of this part.
(e) Cargo segregation/tanks. This column refers to the separation of the
cargo from its surroundings. Terms are
explained in § 151.13–5 and in footnotes
to Table 151.05 of this part.
(f) Tanks/type. This column refers to
the design requirements for cargo
tanks and their placement within the

[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40029, Sept. 29,
1989; CGD 85–061, 54 FR 50965, Dec. 11, 1989]

§ 151.04–7 Nondestructive testing.
(a) Before nondestructive testing
may be conducted to meet § 151.04–5 (d)
and (l), the owner shall submit a proposal to the Officer in Charge, Marine
Inspection that includes—
(1) The test methods and procedures
to be used all of which must meet section V of the ASME Boiler and Pressure Vessel Code (1986);
(2) Each location on the tank to be
tested; and
(3) The test method and procedure to
be conducted at each location on the
tank.
(b) If the Officer in Charge, Marine
Inspection rejects the proposal, the Officer in Charge, Marine Inspection informs the owner of the reasons why the
proposal is rejected.
(c) If the Officer in Charge, Marine
Inspection accepts the proposal, then
the owner shall ensure that—
(1) The proposal is followed; and
(2) Nondestructive testing is performed by personnel meeting ASNT
‘‘Recommended Practice No. SNT–TC–
1A (1988), Personnel Qualification and
Certification in Nondestructive Testing.’’
(d) Within 30 days after completing
the nondestructive test, the owner
shall submit a written report of the re-

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§ 151.05–2

hull of the vessel. Terms are explained
in § 151.15–1.
(g) Tanks/venting. This column refers
to arrangements for preventing excess
pressure or vacuum within the cargo
tank. Terms used are explained and defined in § 151.15–5.
(h) Tanks/gauging devices. This column refers to arrangements provided
for determining the amount of cargo
present in cargo tanks. Terms used are
explained and defined in § 151.15–10.
(i) Cargo transfer/piping. This column
refers to the classification of piping in
accordance with Subchapter F of this
chapter as discussed in § 151.20–1.
(j) Cargo transfer/control. This column
refers to the valving requirements for
the cargo piping system. These requirements are defined in § 151.20–5.
(k) Environmental control/cargo tanks.
This column refers to control of the
composition of the environment within
cargo tanks. Definitions and detailed
requirements are given in § 151.25–1.
(l) Environmental control/cargo handling space. This column refers to control of the environment in the cargo
handling spaces. Definitions and detailed requirements are found in
§ 151.25–2.
(m) Fire protection. This column
specifies whether portable fire extinguishers are required on barges carrying the cargo named. Requirements
for cargoes requiring extinguishers are
given in Subpart 151.30 of this part.
(n) Special requirements. This column
refers to requirements in subparts
151.40, 151.50, 151.55, 151.56, and 151.58 of
this part which apply to specific cargoes. The section numbers listed omit
the preceding part designation, ‘‘151’’.
(o) Electrical hazard class—group. This
column lists the electrical hazard class
and group used for the cargo when de-

termining requirements for electrical
equipment under subchapter J (Electrical engineering) of this chapter.
(p) Temperature control installations.
This column refers to systems which
are used to control the temperature of
the cargo. Definitions and requirements which are applicable if such systems are used are given in Subpart
151.40 of this part.
(q) Tank inspection period. This column refers to the maximum period in
years between internal cargo tank inspections. Applicable requirements are
given in § 151.04–5.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970; 35 FR
6431, Apr. 22, 1970, as amended by CGD 74–275,
40 FR 21958, May 20, 1975; CGD 88–100, 54 FR
40029, Sept. 29, 19895; CGD 96–041, 61 FR 50731,
Sept. 27, 1996; USCG 2000–7079, 65 FR 67183,
Nov. 8, 2000]

§ 151.05–2 Compliance with requirements for tank barges carrying benzene and benzene containing cargoes, or butyl acrylate cargoes.
A tank barge certificated to carry
benzene and benzene containing cargoes or butyl acrylate cargoes must
comply with the gauging requirement
of Table 151.05 of this part by August
15, 1998. Until that date, a tank barge
certificated to carry benzene and benzene containing cargoes must meet either the gauging requirement of Table
151.05 or the restricted or closed gauging requirements in effect on September 29, 1994; and a tank barge certificated to carry butyl acrylate cargoes must meet either the gauging requirements of Table 151.05 or comply
with the open, restricted, or closed
gauging requirements in effect on September 29, 1994.
[CGD 95–900, 60 FR 34050, June 29, 1995]

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Tanks

Vent

Environmental
control

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Acetaldehyde .........

Press.

Amb.

1NA Ind.
2ii
Pressure.

Restr.

P-1

Inert

Vent F

Yes .55-1(h)

I-C

Acetic acid .............

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .50-73
.55-1(g)

I-D

Acetic anhydride ....

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .50-73
.55-1(g)

I-D

Acetone cyanohydrin.

Atmos.

Amb.

1 i i Integral
2i
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.5070(b).
.50-73
.50-81

I-D

Acetonitrile .............

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

Acrylic acid ............

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).
.50-73
.50-81
.58-1(a)

I-D

Acrylonitrile ............

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .55-1(e)
.5070(a).

I-D

Adiponitrile .............

Atmos.

Amb.

1 i i Integral
2i
Gravity.

Open

G-1

Vent F

Yes No .......

I-D

Pressure

Temp.

Hull
type

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space
l.

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46 CFR Ch. I (10–1–01 Edition)

Cargo name

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Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS
Cargo identification1

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III

1 i i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .50-73
.58-1(e)

I-B

Alkyl(C7–C9) nitrates.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .50-81
.50-86

Allyl alcohol ...........

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.50-73

I-C

Allyl chloride ..........

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...

I-D

Aluminum sulfate
solution.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .58-1(e)

Aminoethylethanolamine.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(b)

Ammonia, anhydrous.

Press.

Amb.

1NA Ind.
2ii
Pressure.

SR250
p.s.i.

Restr.

P-2

Vent F

No .50-30
.50-32

I-D

Ammonia, anhydrous.

Atmos.

Low

1NA Ind.
2ii
Gravity.

Restr.

II-L

G-2

Vent F

No .50-30
.50-32

I-D

.401(b)(1)

Ammonium bisulfite
solution (70% or
less).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

No .50-73
.561(a),
(b),
(c).

Ammonium hydroxide (28% or less
NH 3).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

No .561(a),
(b),
(c),
(f),
(g).

I-D

Aniline ....................

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.50-73

I-D

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Alkylbenzenesulfonic acid (greater
than 4%).

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Pressure

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Cargo
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tank

Type

Cargo transfer

Environmental
control

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

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Atmos.

Amb.
Elev.

1 i i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes No .......

I-D

Argon, liquefied .....

Press.

Low

III

1NA Ind.
2i
Pressure.

Restr.

II-L

P-1

Vent F

No .40-1(a)
.50-30
.50-36

.40-1(a)

Benzene ................

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-60

I-D

Benzene hydrocarbon mixtures
(containing
Acetylenes) (having 10% Benzene
or more).

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-60
.561(b),
(d),
(f),
(g),.

I-D

Benzene hydrocarbon mixtures
(having 10%
Benzene or
more).

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-60

I-D

Benzene, Toluene,
Xylene mixtures
(having 10%
Benzene or
more).

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-60

I-D

Butadiene ..............

Press.

Amb.

1NA Ind.
2ii
Pressure.

Restr.

P-2

Vent F

Yes .5070(a).
.50-73

I-B

46 CFR Ch. I (10–1–01 Edition)

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Anthracene oil
(Coal tar fraction).

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

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II

1NA Ind.
2ii
Pressure.

Restr.

P-1

Vent F

Yes .50-30
.5070(a).
.50-73
.561(b),
(d),
(f),
(g).

I-B

Butyl acrylate (all
isomers).

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).
.5081(a),
(b).

I-D

Butylamine (all isomers).

Atmos.

Amb.

1 i i Ind.
2ii
Gravity.

Closed

G-1

Vent F

Yes .55-1(c)

I-D

Butyl methacrylate

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).
.5081(a),
(b).

I-D

Butyraldehyde (all
isomers).

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent F

Yes .55-1(h)

I-C

Camphor oil (light)

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes No .......

I-D

Carbolic oil .............

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.50-73

Carbon dioxide, liquefied.

Press.

Low

III

1NA Ind.
2i
Pressure.

Restr.

I-L

P-1

Vent F

No .50-30

.401(b)(1)

Carbon disulfide ....

Atmos.

Amb.

1NA Ind.
2ii
Gravity.

Restr.

G-1

Inert

Vent F

Yes .50-40
.50-41

I-A

Carbon tetrachloride.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

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No No .......

Pt. 151, Table 151.05

Amb.

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Butadiene, Butylene mixtures
(containing
Acetylenes).

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Temp.

Hull
type

Cargo
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tank

Type

Cargo transfer

Environmental
control

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

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Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Restr.

G-2

Vent N

Caustic potash solution.

Atmos.

Amb.
Elev.

III

1 i Integral
2i
Gravity.

Open

G-1

Caustic soda solution.

Atmos.

Amb.
Elev.

III

1 i Integral
2i
Gravity.

Open

G-1

Chlorine .................

Press.

Amb.

1NA Ind.
2ii
Pressure.

SR300
p.s.i.

Indirect

P-2

Chlorobenzene ......

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Chloroform .............

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

Chlorohydrins
(crude).

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Chloronitrobenzene.
Chlorosulfonic acid

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Yes .50-73

No .50-73
.55-1(j)

Vent F

No .50-30
.50-31

Vent N

Yes No .......

I-D

G-1

Vent F

No No .......

G-1

Vent F

Yes .50-5 ...

I-D

Closed

G-1

Vent F

Yes .50-5 ...
.50-73

Open

G-1

Vent N

No .50-20
.50-21
.50-73

I-B

46 CFR Ch. I (10–1–01 Edition)

Y:\SGML\194183T.XXX

Cashew nut shell
oil (untreated).

Fire
protection required

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

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III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes .50-73

I-D

Coal tar pitch (molten).

Atmos.

Elev.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .50-73

I-D

Creosote ................

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes No .......

Cresols (all isomers).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes No .......

Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Open

G-1

Vent N

No .50-73
.55-1(b)

Crotonaldehyde .....

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(h)

I-C

Cyclohexanone ......

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .561(a),
(b).

I-D

Cyclohexanone,
Cyclohexanol
mixture.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .56-1(b)

I-D

Cresols with 5% or
more Phenol, see
Phenol.
Cresylate spent
caustic.

Cresylic acid, sodium salt solution, see Cresylate spent caustic.

Pt. 151, Table 151.05

Y:\SGML\194183T.XXX

Amb.

Cresols with less
than 5% Phenol,
see Cresols (all
isomers).

Fmt 8010

Atmos.

Coast Guard, DOT

06:32 Oct 11, 2001

Coal tar naphtha
solvent.

VerDate 112000
Tanks

Jkt 194183

Pressure

Temp.

Type

Cargo transfer

Environmental
control

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .561(a),
(b),
(c),
(g).

I-D

Cyclopentadiene,
Styrene, Benzene mixture.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent F

Yes .50-60
.56-1(b)

I-D

iso-Decyl acrylate ..

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .5070(a).
.5081(a),
(b).
.55-1(c)

Dichlorobenzene
(all isomers).

Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes .561(a),
(b).

I-D

Dichlorodifluoromethane.

Press.

Amb.

III

1NA Ind.
2i
Pressure.

Restr.

P-1

No No .......

1,1-Dichloroethane

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

2,2’-Dichloroethyl
ether.

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(f)

I-C

PsN: 194183T

Dichloromethane ...

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

I-D

Fmt 8010
Sfmt 8010
Y:\SGML\194183T.XXX

No No .......

46 CFR Ch. I (10–1–01 Edition)

Atmos.

Frm 00076

Cyclohexylamine ...

pfrm01

PO 00000

Cargo name

Hull
type

Cargo
segregation
tank

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

VerDate 112000
Jkt 194183
PO 00000
Frm 00077
Sfmt 8010
pfrm01
PsN: 194183T

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

No .561(a),
(b),
(c),
(g).

2,4Dichlorophenoxyacetic acid, dimethylamine salt
solution.

Atmos.

Amb.
Elev.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

No .561(a),
(b),
(c),
(g).

2,4Dichlorophenoxyacetic acid,
triisopropanolamine salt solution.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

No .561(a),
(b),
(c),
(g).

1,1Dichloropropane.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

1,2Dichloropropane.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

1,3Dichloropropane.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

1,3Dichloropropene.

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

Dichloropropene,
Dichloropropane
mixtures.

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes No .......

I-D

2,2Dichloropropionic
acid.

Atmos.

Amb.

1 i i Integral
2i
Gravity.

Restr.

G-1

Dry

Vent F

Yes .50-73
.58-1(e)

Diethanolamine ......

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(c)

Diethylamine ..........

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(c)

I-C

Pt. 151, Table 151.05

Y:\SGML\194183T.XXX

Amb.

Fmt 8010

Atmos.

Coast Guard, DOT

06:32 Oct 11, 2001

2,4Dichlorophenoxy
acetic acid,
diethanolamine
salt solution.

VerDate 112000
Tanks

Jkt 194183
PO 00000

Cargo name

Pressure

Temp.

Hull
type

Diethylenetriamine

Cargo
segregation
tank

Type

Cargo transfer

Environmental
control

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Frm 00078
Sfmt 8010
pfrm01
PsN: 194183T

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(c)

Diisobutylamine .....

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(c)

I-C

Diisopropanolamine

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(c)

Diisopropylamine ...

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .55-1(c)

I-C

N,NDimethylacetamide.

Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes .56-1(b)

I-D

Dimethylamine .......

Press.

Amb.

1NA Ind.
2ii
Pressure.

Restr.

P-2

Vent F

Yes .55-1(c)

I-C

Dimethylethanolamine.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .561(b),
(c).

I-C

Dimethylformamide

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(e)

I-D

1,4-Dioxane ...........

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Inert

Vent F

Yes No .......

I-C

Diethyl ether, see
Ethyl ether.

46 CFR Ch. I (10–1–01 Edition)

Y:\SGML\194183T.XXX

Amb.

Fmt 8010

Atmos.

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

VerDate 112000
Jkt 194183
PO 00000
Frm 00079
Sfmt 8010

1 i i Integral
2i
Gravity.

Closed

G-1

Inert
Dry

Vent F

Yes .50-5 ...
.561(a),
(b).

Yes

Di-n-propylamine ...

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(c)

I-C

Dodecyl- dimethylamine,
Tetradecyldimethylamine mixture.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .56-1(b)

Dodecyl phenol ......

Atmos.

Amb.

1 i i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .50-73

I-D

Epichlorohydrin ......

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...

I-C

Ethanolamine .........

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(c)

I-D

Ethyl acrylate .........

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).
.5081(a),
(b).

I-D

Ethylamine solution
(72% or less).

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .55-1(b)

I-D

N-Ethylbutylamine

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(b)

I-C

Ethyl chloride .........

Press.

Amb.

1NA Ind.
2ii
Pressure.

Restr.

P-2

Vent F

Yes No .......

I-D

NEthylcyclohexylamine.

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(b)

I-C

pfrm01
PsN: 194183T

Pt. 151, Table 151.05

Y:\SGML\194183T.XXX

Elev.

Fmt 8010

Atmos.

Coast Guard, DOT

06:32 Oct 11, 2001

Diphenylmethane
diisocyanate.

VerDate 112000
Tanks

Jkt 194183
PO 00000

Cargo name

Pressure

Temp.

Hull
type

Cargo
segregation
tank

Type

Cargo transfer

Environmental
control

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Frm 00080

Fmt 8010
Sfmt 8010
pfrm01
PsN: 194183T

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.50-73

I-D

Ethylene cyanohydrin.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes No .......

Ethylenediamine ....

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(c)

I-D

Ethylene dibromide

Atmos.

Amb.

1 i i Integral
2i
Gravity.

Closed

G-1

Vent F

No No .......

Ethylene dichloride

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

Ethylene glycol
monoalkyl ethers.
Including:
2-Ethoxyethanol
Ethylene glycol
butyl ether
Ethylene glycol tertbutyl ether
Ethylene glycol
ethyl ether
Ethylene glycol
methyl ether
Ethylene glycol npropyl ether
Ethylene glycol isopropyl ether

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-C

46 CFR Ch. I (10–1–01 Edition)

Y:\SGML\194183T.XXX

Ethylene
chlorohydrin.

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

VerDate 112000
Jkt 194183
PO 00000
Frm 00081

Fmt 8010
Sfmt 8010
pfrm01
PsN: 194183T

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes No .......

Ethylene glycol
propyl ether.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes No .......

Ethylene oxide .......

Press.

Amb.

1NA Ind.
2ii
Pressure.

Restr.

P-2

Inert

Vent F

Yes .50-10
.50-12

I-B

.40-1(c)

Ethyl ether .............

Atmos.

Amb.

1NA Ind.
2ii
Gravity.

Closed

G-1

Inert

Vent F

Yes .50-40
.50-42

I-C

2-Ethylhexyl acrylate.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .5070(a).
.5081(a),
(b).

I-D

Ethylidene
norbornene.

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.50-74

Ethyl methacrylate

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).

I-D

2-Ethyl-3propylacrolein.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-C

Ferric chloride solutions.

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Open

G-1

Vent N

No .50-20
.50-75

I-B

Fluorosilicic acid
(30% or less).

Atmos.

Amb.

1 i i Ind.
2ii
Gravity.

Closed

G-1

Vent F

No .50-20
.50-22
.50-73
.50-77

I-B

Formaldehyde solution (37% to
50%).

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

No .55-1(h)

I-B

Pt. 151, Table 151.05

Y:\SGML\194183T.XXX

Atmos.

Coast Guard, DOT

06:32 Oct 11, 2001

Ethylene glycol
hexyl ether.

VerDate 112000
Tanks

Jkt 194183
PO 00000

Cargo name

Pressure

Temp.

Hull
type

Cargo
segregation
tank

Type

Cargo transfer

Environmental
control

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Frm 00082

Fmt 8010
Sfmt 8010

Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes .50-73
.55-1(i)

I-D

Furfural ..................

Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes .55-1(h)

I-C

Glutaraldehyde solution (50% or
less).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

No No .......

Glyoxylic acid solution (50% or less).

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .50-73
.50-81
.58-1(e)

Hexamethylenediamine solution.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes .55-1(c)

I-D

Hexamethyleneimine.

Atmos.

Amb.

1 i i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes .561(b),
(c).

I-C

Hydrochloric acid ...

Atmos.

Amb.

III

1NA Ind.
2ii
Gravity.

Open

G-1

Vent F

No .50-20
.50-22
.50-73

I-B

pfrm01

Hydrofluorosilicic
acid (25% or
less), see
Fluorosilicic acid
(30% or less).

PsN: 194183T

46 CFR Ch. I (10–1–01 Edition)

Y:\SGML\194183T.XXX

Formic acid ............

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

VerDate 112000
1 i i Integral
2i
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.5070(a).
.50-73
.5081(a),
(b).

Isoprene .................

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent F

Yes .5070(a).
.5081(a),
(b).

I-D

Kraft pulping liquors
(free alkali content 3% or more)
(including: Black,
Green, or White
liquor).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

No .50-73
.561(a),
(c),
(g).

Mesityl oxide ..........

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

Methylacetylene,
Propadiene mixture.

Press.

Amb.

III

1 NA Ind.
2ii
Pressure.

Restr.

P-2

Vent F

Yes .50-79

I-C

Methyl acrylate ......

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).
.5081(a),
(b).

I-D

Methylamine solution (42% or less).

Atmos.

Amb.

1NA Ind.
2ii
Gravity.

Closed

G-1

Vent F

Yes .561(a),
(b),
(c),
(g).

I-D

Methyl bromide ......

Press.

Amb.

1NA Ind.
2ii
Pressure.

Closed

P-2

Vent F

Yes .50-5 ...

I-D

PsN: 194183T

Methyl chloride ......

Press.

Amb.

1NA Ind.
2ii
Pressure.

Restr.

P-2

Vent F

Yes .55-1(c)

I-D

PO 00000
Frm 00083

Fmt 8010
Sfmt 8010
Y:\SGML\194183T.XXX

Pt. 151, Table 151.05

Coast Guard, DOT

Amb.

Jkt 194183

Atmos.

pfrm01

06:32 Oct 11, 2001

2-Hydroxyethyl acrylate.

VerDate 112000
Tanks

Jkt 194183
PO 00000

Cargo name

Pressure

Temp.

Hull
type

Cargo
segregation
tank

Type

Cargo transfer

Environmental
control

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Frm 00084

Fmt 8010
Sfmt 8010
pfrm01
PsN: 194183T

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-B

Methyl
diethanolamine.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .561(b),
(c).

I-C

2-Methyl-5ethylpyridine.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(e)

I-D

Methyl methacrylate.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).
.5081(a),
(b).

I-D

2-Methylpyridine ....

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(c)

I-D

alphaMethylstyrene.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).
.5081(a),
(b).

I-D

Monochlorodifluoromethane.

Press.

Amb.

III

1NA Ind.
2i
Pressure.

Restr.

P-1

No No .......

Morpholine .............

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .55-1(c)

I-C

46 CFR Ch. I (10–1–01 Edition)

Y:\SGML\194183T.XXX

Methylcyclopentadiene dimer.

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

VerDate 112000
Jkt 194183
PO 00000
Frm 00085
Sfmt 8010
pfrm01
PsN: 194183T

1 i i Ind.
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-6 ...
.50-73

I-D

.50-6

Nitric acid (70% or
less).

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

No .50-20
.50-73
.50-80

I-B

Nitrobenzene .........

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.50-73

I-D

Nitrogen, liquefied

Press.

Low

III

1NA Ind.
2i
Pressure.

Restr.

II-L

P-1

Vent F

No .40-1(a)
.50-30
.50-36

.40-1(a)

1- or 2Nitropropane.

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .50-81

I-C

o-Nitrotoluene ........

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.50-73

I-D

Oleum ....................

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Open

G-1

Vent N

No .50-20
.50-21
.50-73

I-B

Pentachloroethane

Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Restr.

G-1

Vent F

No No .......

1,3-Pentadiene ......

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).
.50-81

I-D

Perchloroethylene ..

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

No No .......

Octyl nitrates (all
isomers), see
Alkyl(C7–C9) nitrates.

Pt. 151, Table 151.05

Y:\SGML\194183T.XXX

Amb.

Fmt 8010

Atmos.

Coast Guard, DOT

06:32 Oct 11, 2001

Motor fuel antiknock compounds (containing lead
alkyls).

VerDate 112000
Tanks

Jkt 194183

Pressure

Temp.

Type

Cargo transfer

Environmental
control

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Amb.

1 i i Integral
2i
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.50-73

I-D

Phosphoric acid .....

Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Open

G-1

Vent N

No .50-20
.50-23
.50-73

I-B

Phosphorus, white
(elemental).

Atmos.

Elev.

1 i i Integral
2ii
Gravity.

Closed

G-1

Water
Pad

Vent F

Yes .50-50

4-8

Phthalic anhydride
(molten).

Atmos.

Elev.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

Polyethylene
polyamines.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(e)

Polymethylene
polyphenyl
isocyanate.

Atmos.

Amb.

1 i i Integral
2i
Gravity.

Closed

G-1

Dry

Vent F

Yes .55-1(e)

iso-Propanolamine

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(c)

I-D

PsN: 194183T

Propanolamine
(iso-, n-).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .561(b),
(c).

I-D

Fmt 8010
Sfmt 8010
Y:\SGML\194183T.XXX

Potassium hydroxide solution, see
Caustic potash
solution.

46 CFR Ch. I (10–1–01 Edition)

Atmos.

Frm 00086

Phenol ...................

pfrm01

PO 00000

Cargo name

Hull
type

Cargo
segregation
tank

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

VerDate 112000
1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .50-73
.55-1(g)

I-D

iso-Propylamine .....

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .55-1(c)

I-D

Propylene oxide .....

Press.

Amb.

1NA Ind.
2ii
Pressure.

Restr.

P-1

Inert

Vent F

Yes .50-10
.50-13

I-B

iso-Propyl ether .....

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Inert

Vent F

Yes .5070(a).

I-D

Pyridine ..................

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(e)

I-D

Sodium aluminate
solution (45% or
less).

Atmos.

Amb.
Elev.

III

1 i Integral
2i
Gravity.

Open

G-1

No .50-73
.561(a),
(b),
(c).

Sodium chlorate
solution (50% or
less).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

No .50-73

Sodium dichromate
solution (70% or
less).

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Open

Closed

G-1

Vent N

No .50-5(d)
.50-73
.561(b),
(c).

pfrm01

Sodium hypochlorite solution
(20% or less).

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

No .50-73
.561(a),
(b).

PO 00000
Frm 00087

Fmt 8010
Sfmt 8010

Sodium hydroxide
solution, see
Caustic soda solution.

PsN: 194183T

Pt. 151, Table 151.05

III

Coast Guard, DOT

Amb.

Jkt 194183

Atmos.

Y:\SGML\194183T.XXX

06:32 Oct 11, 2001

Propionic acid ........

VerDate 112000
Tanks

Jkt 194183
PO 00000

Cargo name

Pressure

Temp.

Hull
type

Cargo transfer

Environmental
control

Cargo
segregation
tank

Type

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Frm 00088

Fmt 8010
Sfmt 8010
pfrm01
PsN: 194183T

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

No .50-73
.55-1(b)

Sodium sulfide, hydrosulfide solutions (H2S greater than 15ppm
but less than
200ppm).

Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Restr.

G-1

Vent F

No .50-73
.55-1(b)

Sodium sulfide, hydrosulfide solutions (H2S greater than 200ppm).

Atmos.

Amb.

1 i i Integral
2i
Gravity.

Closed

G-1

Vent F

No .50-73
.55-1(b)

Sodium thiocyanate
solution (56% or
less).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .58-1(a)

Styrene monomer ..

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .5070(a).
.5081(a),
(b).

I-D

Sulfur (molten) .......

Atmos.

Elev.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .50-55

I-C

.401(f)(1)

Sulfur dioxide .........

Press.

Amb.

1NA Ind.
2ii
Pressure.

Closed ..............

P-2

Vent F

No .50-30
.50-84
.55-1(j)

Sulfuric acid ...........

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Open

G-1

Vent N

No .50-20
.50-21
.50-73

I-B

Open

46 CFR Ch. I (10–1–01 Edition)

Y:\SGML\194183T.XXX

Sodium sulfide, hydrosulfide solutions (H2S 15ppm
or less).

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

VerDate 112000
Jkt 194183
PO 00000
Frm 00089

Fmt 8010
Sfmt 8010
pfrm01
PsN: 194183T

Amb.

III

1 i i Integral
2ii
Gravity.

Open

G-1

Vent N

No .50-20
.50-21
.50-73

I-B

1,1,2,2Tetrachloroethane.

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

No No .......

Tetraethylenepentamine.

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent N

Yes .55-1(c)

I-C

Tetrahydrofuran .....

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(b).

I-C

Toluenediamine .....

Atmos.

Elev.

1 i i Integral
2i
Gravity.

Closed

G-1

Vent F

Yes .50-73
.561(a),
(b),
(c),
(g).

Toluene
diisocyanate.

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Dry
N2

Vent F

Yes .50-5 ...
.55-1(e)

I-D

o-Toluidine .............

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Closed

G-1

Vent F

Yes .50-5 ...
.50-73

I-D

1,2,4Trichlorobenzene.

Atmos.

Amb.

III

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes No .......

I-D

1,1,2-Trichloroethane.

Atmos.

Amb.

III

1 i i Integral
2i
Gravity.

Restr.

G-1

Vent F

No .50-73
.56-1(a)

I-D

Trichloroethylene ...

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

No No .......

I-D

1,2,3Trichloropropane.

Atmos.

Amb.

1 i i Integral
2i
Gravity.

Restr.

G-1

Vent F

Yes .50-73
.56-1(a)

I-D

Pt. 151, Table 151.05

Y:\SGML\194183T.XXX

Atmos.

Coast Guard, DOT

06:32 Oct 11, 2001

Sulfuric acid, spent

VerDate 112000
Tanks

Jkt 194183
PO 00000

Cargo name

Pressure

Temp.

Hull
type

Cargo
segregation
tank

Type

Cargo transfer

Environmental
control

Vent

Gauging
device

Piping
class

Control

Cargo
tanks

Cargo
handling
space

Fire
protection required

Special
requirements
in 46
CFR
Part
151

Electrical
hazard
class
and
group

Temp.
control
install.

Tank internal inspect.
period—
years

Frm 00090

Fmt 8010
Sfmt 8010
pfrm01
PsN: 194183T

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(b)

I-C

Triethylamine .........

Atmos.

Amb.

1 i i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .55-1(e)

I-C

Triethylenetetramine.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

Vent N

Yes .55-1(b)

I-C

Triphenylborane
(10% or less),
Caustic soda solution.

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

No .561(a),
(b),
(c).

Trisodium phosphate solution.

Atmos.

Amb.
Elev.

III

1 i Integral
2i
Gravity.

Open

G-1

No .50-73
.561(a),
(c).

Urea, Ammonium
nitrate solution
(containing more
than 2% NH 3).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Restr.

G-1

Vent F

No .56-1(b)

I-D

Valeraldehyde (all
isomers).

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Inert

Vent F

Yes No .......

I-C

Vanillan black liquor (free alkali
content 3% or
more).

Atmos.

Amb.

III

1 i Integral
2i
Gravity.

Open

G-1

No .50-73
.561(a),
(c),
(g).

46 CFR Ch. I (10–1–01 Edition)

Y:\SGML\194183T.XXX

Triethanolamine .....

Pt. 151, Table 151.05

06:32 Oct 11, 2001

TABLE 151.05—SUMMARY OF MINIMUM REQUIREMENTS—Continued
Cargo identification1

VerDate 112000
Jkt 194183
PO 00000

Amb.

III

1 i Integral
2ii
Gravity.

Open

G-1

Vent F

Yes .5070(a).
.5081(a),
(b).

I-D

Vinyl chloride .........

Press.

Amb.

1NA Ind.
2ii
Pressure.

Closed

P-2

Vent F

Yes .50-30
.50-34

I-D

Vinyl chloride .........

Atmos.

Low

1NA Ind.
2ii
Gravity.

Closed

II-L

G-2

Vent F

Yes .50-30
.50-34

I-D

.401(b)(1)

Vinylidene chloride

Atmos.

Amb.

1NA Ind.
2ii
Gravity.

Closed

P-2

Padded

Vent F

Yes .55-1(f)
.5070(a).
.5081(a),
(b).

I-D

Vinyltoluene ...........

Atmos.

Amb.

III

1 i Integral
2ii
Gravity.

Restr.

G-1

Vent F

Yes .5070(a).
.50-81
.561(a),
(b),
(c),
(g).

I-D

For requirements
................ ..........
see these sections in Part 151:.

.10- 1

.13- 5 .15- 1 ..

.15-5

.15- 10

.20- 1

.20- 5

.25-1

.25-2

111.105
(Subchapter
J)

.40

.04- 5

Frm 00091

Atmos.

Fmt 8010
Sfmt 8010

............

pfrm09
PsN: 194183T

Pt. 151, Table 151.05

Y:\SGML\194183T.XXX

See Table 2 of Part 153 for additional cargoes permitted to be carried by tankbarge.
Terms and symbols:
Segregation—Tank—
Line 1—Segregation of cargo from surrounding waters:
i=Skin of vessel (single skin) only required. Cargo tank wall can be vessel’s hull.
i i=Double skin required. Cargo tank wall cannot be vessel’s hull.
Line 2—Segregation of cargo space from machinery spaces and other spaces which have or could have a source of ignition:
i=Single bulkhead only required. Tank wall can be sole separating medium.
i i=Double bulkhead required. Cofferdam, empty tank, pumproom, tank with Grade E Liquid (if compatible with cargo) is satisfactory.

.30

Coast Guard, DOT

14:23 Oct 22, 2001

Vinyl acetate ..........

VerDate 112000
Jkt 194183
PO 00000

Pt. 151, Table 151.05

14:23 Oct 22, 2001

Internal tank inspection—
G—Indicates cargo is subject to general provisions of 151.04-5(b).
Specific numbers in this column are changes from the general provisions.
Abbreviations used:
Tank type: Ind=Independent.
Vent:
PV=Pressure vacuum valve.
SR=Safety relief.
Gauging device: Restr.=Restricted.
General usage:
NR=No requirement.
NA=Not applicable.
1. The provisions contained in 46 CFR Part 197, subpart C, apply to liquid cargoes containing 0.5% or more benzene by volume.

[USCG 2000–7079, 65 FR 67183, Nov. 8, 2000]

Frm 00092

Fmt 8010
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PsN: 194183T

46 CFR Ch. I (10–1–01 Edition)

Y:\SGML\194183T.XXX

Coast Guard, DOT

§ 151.10–20
subdivision and damage stability, as
specified in subpart E of part 172 of this
chapter; and
(ii) Hull structural requirements, including an assumed grounding condition.
(4) Type III barge hull. Barge hulls
classed as Type III are those designed
to carry products of sufficient hazard
to require a moderate degree of control. These barges are required to meet:
(i) Standards of intact stability as
specified in subpart E of part 172 of this
chapter; and
(ii) Hull structural requirements.

Subpart 151.10—Barge Hull
Construction Requirements
§ 151.10–1 Barge hull classifications.
(a) Each barge constructed or converted in conformance with this subpart shall be assigned a hull type number.
(1) Effective dates for certain requirements:
(i) Barges constructed or converted
between July 1, 1964, and June 1, 1970,
in accordance with the construction requirements of §§ 32.63 and 98.03 of this
chapter are considered to comply with
the basic provisions of this subpart and
will retain the hull type classification
for the service for which they were
originally approved. Changes in product endorsement will not be considered
a change in service, except when a
change to a product of higher specific
gravity necessitates a reevaluation of
the intact and damage stability requirements in subpart E of part 172 of
this chapter.
(2) [Reserved]
(b) For this purpose the barge hull
types shall be defined as follows:
(1) Type I barge hull. Barge hulls
classed as Type I are those designed to
carry products which require the maximum preventive measures to preclude
the uncontrolled release of the cargo.
These barges are required to meet:
(i) Standards of intact stability and a
modified two compartment standard of
subdivision and damage stability, as
specified in subpart E of part 172 of this
chapter; and
(ii) Hull structural requirements, including an assumed grounding condition.
(2) Type I–S (special) barge hulls. Type
I–S (special) barge hulls are those constructed or converted for the carriage
of chlorine in bulk prior to July 1, 1964,
and modified to higher stability standards prior to July 1, 1968, but not meeting the requirements for full Type I
classification.
(3) Type II barge hull. Barge hulls
classed as Type II are those designed to
carry products which require significant preventive measures to preclude
the uncontrolled release of the cargo.
These barges are required to meet:
(i) Standards of intact stability and a
modified one compartment standard of

[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 79–023, 48 FR 51008, Nov. 4,
1983; CGD 88–100, 54 FR 40040, Sept. 29, 1989]

§ 151.10–5 Subdivision and stability.
Each barge must meet the applicable
requirements in subchapter S of this
chapter.
[CGD 70–023, 48 FR 51009, Nov. 4, 1983]

§ 151.10–15 Certificate endorsement.
(a)–(b) [Reserved]
(c) Certificate endorsement. The following information shall be submitted,
and upon approval of calculations shall
form part of the endorsement on the
Certificate of Inspection:
(1) Limiting draft for each hull type
service for which approval is requested.
(2) Maximum density (lb./gal.) and
maximum cargo weight (tons) for each
tank for which approval is requested.
Their weights will normally reflect
uniform loading except that for trim
purposes the individual tank cargo
weight may exceed the uniform loading
tank cargo weight, corresponding to
the barge fresh water deadweight at
the limiting draft, by 5 percent. Where
a greater degree of nonuniform loading
is desired, longitudinal strength calculations shall be submitted.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 79–023, 48 FR 51009, Nov. 4,
1983]

§ 151.10–20 Hull construction.
(a) Construction features. (1) Each
barge hull shall be constructed with a
suitable bow form (length, shape, and
height of headlog) to protect against
diving at the maximum speed at which
the barge is designed to be towed. In

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§ 151.10–20

46 CFR Ch. I (10–1–01 Edition)

any integrated tow, only the lead barge
need comply with this requirement.
(2) All ‘‘open hopper’’ type barges
shall be provided with coamings around
the hopper space and a 36–inch minimum height plowshare breakwater on
the forward rake. The plowshare breakwater may be omitted, if it is demonstrated to the satisfaction of the
Commandant that sufficient protection
is achieved without it. Coamings shall
have a minimum height of 36 inches
forward and may be graduated to a
minimum height of 24 inches at
midlength and 18 inches thereafter. All
hopper barges constructed with a
weathertight rain shield over the hopper space are exempt from these requirements, except that they shall be
provided with an 18–inch minimum coaming all around the hopper.
(3) All ‘‘open hopper’’ type barges
modified for the carriage of chlorine in
bulk shall be provided with 36–inch
minimum height coamings around the
hopper.
(4) All barges in ocean or coastwise
service shall be provided with a structural deck and hatches in accordance
with the applicable provisions of subchapter E of this chapter and the
scantling requirements of the American Bureau of Shipping.
(b) Hull structural requirements. (1) All
Types I, II, and III barges shall comply
with the basic structural requirements
of the American Bureau of Shipping for
barges of the ordinary types and the
applicable supplementary requirements
of this section.
(2) Types I and II barges in inland
service: A grounding condition shall be
assumed where the forward rake bulkhead rests upon a pinnacle at the water
surface. The maximum hull and tank
bending moment and tank saddle reactions (if applicable) shall be determined. The hull bending stress shall
not exceed the applicable limits of
paragraphs (b)(2) (i), (ii), or (iii) of this
section. The maximum tank bending
moment and saddle reaction shall be
used in the tank design calculations required by § 151.15–2(b)(3).
(i) Independent tanks supported by
only two saddles do not contribute to
the strength and stiffness of the barge
hull. In such case, the hull stress shall
not exceed either 50 percent of the min-

imum ultimate tensile strength of the
material or 70 percent of the yield
strength when specified, whichever is
greater.
(ii) Independent tanks supported by
three or more saddles contribute to the
strength and stiffness of the hull. In
such case, the hull stress shall not exceed the percentage stress values prescribed in § 151.10–20(b)(2)(i), multiplied
by the quantity
(1.5¥SWT/UTS),
where SWT is the stress calculated
without including the effect of the
tanks, and UTS is the minimum ultimate tensile strength of the material.
The value SWT, however, shall in no
case be more than 75 percent of UTS.
(iii) Integral tanks may be considered as contributing to the strength
and stiffness of the barge hull. The hull
stresses for integral tank barges shall
not exceed the percentage stress values
prescribed in paragraph (b)(2)(i), of this
section.
(3) Types I and II barges in ocean
service:
(i) Independent tank barges with
tanks supported by three or more saddles shall be subjected to a 0.6L 0. 6 trochoidal wave hogsag analysis to determine the maximum hull and tank
bending moments and tank saddle reactions.
(ii) All independent tank barges, regardless of the number of saddle supports shall be subject to a still water
bending analysis to determine the hull
bending moment. For those barges
with independent tanks supported by
three or more saddles, this analysis
shall consider tank-hull interaction so
as to determine tank bending moments
and saddle reactions.
(iii) The still water tank bending moments and saddle reactions shall be superimposed upon those obtained by simultaneous application of the following dynamic loadings:
(a) Rolling 30° each side (120° full
cycle) in 10 seconds.
(b) Pitching 6° half amplitude (24° full
cycle) in 7 seconds.
(c) Heaving L/80 half amplitude (L/20
full cycle) in 8 seconds.
(iv) The hull structure and saddle
support system shall be analyzed, using
the maximum hull bending moments

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Coast Guard, DOT

§ 151.13–1

and saddle reactions obtained from the
foregoing. Bending stress shall not exceed 60 percent of the yield strength or
42 percent of the minimum tensile
strength of the material, whichever is
less. Critical buckling strength shall be
at least 75 percent greater than calculated buckling stresses. The maximum tank bending moments and saddle reactions shall be used in the tank
design calculations required by § 151.15–
3(b)(8).

Mesityl oxide
Methyl methacrylate
Morpholine
1- or 2-Nitropropane
Phosphoric acid
Polyethylene polyamines
Polymethylene polyphenyl isocyanate
Propionic acid
iso-Propyl ether
Pyridine
Tetraethylenepentamine
Tetrahydrofuran
Triethanolamine
Triethylenetetramine

Subpart 151.12—Equipment and
Operating Requirements for
Control of Pollution From Category D NLS Cargoes

[CGD 81–101, 52 FR 7777, Mar. 12, 1989, as
amended by CGD 88–100, 54 FR 40040, Sept. 29,
1989; CGD 92–100, 59 FR 17028, Apr. 11, 1994;
CGD 94–900, 59 FR 45139, Aug. 31, 1994; CGD
94–902, 60 FR 34043, June 29, 1995; USCG 2000
–7079, 65 FR 67196, Nov. 8, 2000]

SOURCE: CGD 81–101, 52 FR 7777, Mar. 12,
1987, unless otherwise noted.

§ 151.12–10 Operation of oceangoing
non-self-propelled ships Carrying
Category D NLS.
(a) An oceangoing non-self-propelled
ship may not carry in a cargo tank a
Category D NLS cargo listed under
§ 151.12–5 unless the ship has on board a
Certificate of Inspection and for ships
making foreign voyages an NLS Certificate endorsed under that section to
allow the cargo tank to carry the NLS
cargo.
(b) The person in charge of an oceangoing non-self-propelled ship that carries a Category D NLS listed under
§ 151.12–5 shall ensure that the ship is
operated as prescribed for the operation of oceangoing ships carrying Category D NLSs in §§ 153.901, 153.909,
153.1100, 153.1102, 153.1104, 153.1106,
153.1124, 153.1126, 153.1128, 153.1130 and
153.1132 of this chapter.

§ 151.12–5 Equipment for Category D
NLS.
The Coast Guard endorses the Certificate of Inspection and for ships making
foreign voyages issues the endorsed
NLS Certificate required by § 151.12–10
for an oceangoing non-self-propelled
ship to carry as bulk cargo the following Category D NLSs if the ship
meets the requirements of this part
and the requirements applying to ships
that carry Category D NLS cargoes in
§§ 153.470, 153.486, and 153.490 of this
chapter:
Acetic acid
Acrylic acid
Adiponitrile
Aminoethylethanolamine
Ammonium bisulfite solution
Butyl methacrylate
Caustic soda solution
Coal tar pitch
Cyclohexanone
Cyclohexanone, Cychexanol mixture
Dichloromethane
2,2-Dichloropropionic acid
Diethylenetriamine
N,N-Dimethylacetamide
Dimethylethanolamine
Dimethylformamide
1,4-Dioxane
Ethanolamine
N-Ethylcyclohexylamine
Ethylene cyanohydrin
Ethylene glycol monoalkyl ethers
Ethyl methacrylate
Formic acid
Glutaraldehyde solution
Glyoxylic acid solution (50% or less)
Hydrochloric acid

[CGD 81–101, 52 FR 7777, Mar. 12, 1987, as
amended by CGD 81–101, 53 FR 28974, Aug. 1,
1988 and 54 FR 12629, Mar. 28, 1989]

Subpart 151.13—Cargo
Segregation
§ 151.13–1 General.
This subpart prescribes the requirements for cargo segregation for cargo
tanks. These requirements are based on
considerations of cargo reactivity, stability, and contamination of the surroundings and other cargoes.
[CGD 88–100. 54 FR 40029, Sept. 29, 1989, as
amended by CGD 96–041, 61 FR 50731, Sept. 27,
1996]

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§ 151.13–5
§ 151.13–5

46 CFR Ch. I (10–1–01 Edition)
essential to the structural completeness of its vessel’s hull.
(b) Independent. A cargo containment
envelope which is not a contiguous
part of the hull structure. An independent tank is built and installed so
as to eliminate, wherever possible (or,
in any event, to minimize) its stressing
as a result of stressing or motion of the
adjacent hull structure. In general,
therefore, motion of parts of the tank
relative to the adjacent hull structure
is possible. An independent tank is not
essential to the structural completeness of its carrying vessel’s hull.
(c) Gravity. Tanks having a design
pressure (as described in Part 54 of this
chapter) not greater than 10 pounds per
square inch gauge and of prismatic
shape or other geometry where stress
analysis is neither readily nor completely determinate. (Integral tanks
are of the gravity type.)
(d) Pressure. Independent tanks whose
design pressure (as described in Part 54
of this chapter) is above 10 pounds per
square inch gauge and fabricated in accordance with part 54, of this chapter.
Independent gravity tanks which are of
normal pressure vessel configuration
(i.e., bodies of revolution, in which the
stresses are readily determinate) shall
be classed as pressure vessel type tanks
even though their maximum allowable
working pressure is less than 10 pounds
per square inch gauge. Pressure vessel
tanks shall be of Classes I, I–L, II, II–L,
or III, as defined in subchapter F of
this chapter.

Cargo segregation—tanks.

(a) The configurations listed in this
paragraph refer to the separation of
the cargo from its surroundings and
list the various degrees of segregation
required. Paragraphs and (2) of this
section explain the symbols used in
lines 1 and 2, in order, under the tank
segregation column of Table 151.05.
(1) Segregation of cargo from surrounding waters (Line 1 of Table
151.05).
i=Skin of vessel (single skin) only required. Cargo tank wall can be vessel’s hull.
ii=Double skin required. Cargo tank
wall cannot be vessel’s hull.
NA=Nonapplicable for this case. Independent tanks already have such
segregation built in through design.
(2) Segregation of cargo space from
machinery spaces and other spaces
which have or could have a source of
ignition (Line 2 of Table 151.05).
i=Single bulkhead only required. Tank
wall can be sole separating medium.
ii=Double
bulkhead,
required.
Cofferdam, empty tank, pumproom,
tank with Grade E Liquid (if compatible with cargo) is satisfactory.
(b) [Reserved]
(c) If a cofferdam is required for segregation purposes and a secondary barrier is required for low temperature
protection by § 151.15–3(d)(4), the void
space between the primary and secondary barriers shall not be acceptable
in lieu of the required cofferdam.

§ 151.15–3 Construction.
This section lists the requirements
for construction of the types of cargo
tanks defined in § 151.15–1.
(a) Gravity type tanks. Gravity type
cargo tanks vented at a pressure of 4
pounds per square inch gauge or less
shall be constructed and tested as required by standards established by the
American Bureau of Shipping or other
recognized classification society. Gravity type tanks vented at a pressure exceeding 4 but not exceeding 10 pounds
per square inch gauge will be given special consideration by the Commandant.
(b) Pressure vessel type tanks. Pressure
vessel type tanks shall be designed and
tested in accordance with the requirements of Part 54 of this chapter.

[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 75–59, 45 FR 70273, Oct. 23,
19805; CGD 96–041, 61 FR 50731, Sept. 27, 1996]

Subpart 151.15—Tanks
§ 151.15–1

Tank types.

This section lists the definitions of
the various tank types required for
cargo containment by Table 151.05.
(a) Integral. A cargo containment envelope which forms a part of the vessel’s hull in which it is built, and may
be stressed in the same manner and by
the same loads which stress the contiguous hull structure. An integral tank is

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§ 151.15–3
where:
tz=Service temperature.
tw=Boiling temperature of gas at normal
working pressure of container but not
higher than +32 °F.
tB=Boiling temperature of gas at atmospheric pressure.

(1) Uninsulated cargo tanks, where
the cargo is transported, at or near ambient temperatures, shall be designed
for a pressure not less than the vapor
pressure of the cargo at 115 °F. The design shall also be based on the minimum internal pressure (maximum
vacuum), plus the maximum external
static head to which the tank may be
subjected.
(2) When cargo tanks, in which the
cargo is transported at or near ambient
temperature, are insulated with an insulation material of a thickness to provide a thermal conductance of not
more than 0.075 B.t.u. per square foot
per degree Fahrenheit differential in
temperature per hour, the tanks shall
be designed for a pressure of not less
than the vapor pressure of the cargo at
105 °F. The insulation shall also meet
the requirements of paragraph (f) of
this section.
(3) Cargo tanks in which the temperature is maintained below the normal atmospheric temperature by refrigeration or other acceptable means
shall be designed for a pressure of not
less than 110 percent of the vapor pressure corresponding to the temperature
of the liquid at which the system is
maintained, or the pressure corresponding to the greatest dynamic
and static loads expected to be encountered in service. For mechanically
stressed relieved cargo tanks, additional factors relating design pressure
and maximum allowable pressure shall
be as specified by the Commandant.
The material of the tank shall meet
the material requirements specified in
part 54 of this chapter for the service
temperature, and this temperature
shall be permanently marked on the
tank as prescribed in § 54.10–20 of this
chapter.
(4) The maximum allowable temperature of the cargo is defined as the boiling temperature of the liquid at a pressure equal to the setting of the relief
valve.
(5) The service temperature is the
minimum temperature of a product at
which it may be contained, loaded and/
or transported. However, the service
temperature shall in no case be taken
higher than given by the following formula.
tz=tw¥0.25(tw¥tB)

Under normal circumstances, only
temperatures due to refrigerated service will be considered in determining
the service temperature. Refrigerated
service for purposes of this paragraph
is defined as service where the temperature is controlled in the process
rather than being caused by atmospheric conditions.
(6) Heat transmission studies, where
required, shall assume the minimum
ambient temperatures of 0 °F still air
and 32 °F still water, and maximum
ambient temperatures of 115 °F still air
and 90 °F still water.
(7) Where applicable, the design of
the cargo tanks shall investigate the
thermal stresses induced in the tanks
at the service temperature.
(8) Calculations showing the stress
level in the tanks under dynamic loading conditions for ocean service barges
(see § 151.10–20(b)(4)) and grounding conditions for inland service barges (see
§ 151.10–20–(b)(2)) shall be submitted to
the Commandant for approval. These
calculations shall take into account
the local stresses due to the interaction between the barge hull and the
tanks.
(c) High density cargo. Cargoes with a
specific gravity greater than that for
which the scantlings of the tank are
designed may be carried provided that:
(1) The maximum cargo weight (tons)
in a specific tank does not exceed the
maximum cargo weight (tons) endorsed
on the certificate of inspection.
(2) The scantlings of the tank are sufficient to prevent rupture under a full
head of the higher density cargo.
Scantlings meeting ordinary bulkhead
requirements for the full head will satisfy this requirement.
(d) Arrangements—(1) Collision protection. (i) Tanks containing cargoes
which are required to be carried in
Type I hulls by Table 151.05 shall be located a minimum of 4 feet inboard
from the side shell and box end of the
vessel. Tanks containing cargoes which
are required to be carried in Type II

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§ 151.15–3

46 CFR Ch. I (10–1–01 Edition)

hulls by Table 151.05 shall be located a
minimum of 3 feet inboard from the
side shell and box end of the vessel.
(ii) All independent cargo tanks installed on Type I or Type II barge hulls
shall be protected with suitable collision chocks or collision straps. A longitudinal collision load of one and one
half times the combined weight of the
tank and the cargo shall be assumed.
All other independent cargo tanks
shall be provided with suitable collision chocks or collision straps assuming a longitudinal collision load equal
to the combined weight of the tank and
the cargo. The design bearing stress
shall not exceed 2 times the yield
strength or 1.5 times the minimum ultimate strength, whichever is less.
(iii) Tanks containing cargoes, which
are required to be carried in Type I or
Type II hulls by Table 151.05, shall be
located a minimum of 25 feet from the
head log at the bow. Box barges and
trail barges need not comply with this
requirement.
(2) Inspection clearances. The distance
between tanks or between a tank and
the vessel’s structure shall be such as
to provide adequate access for inspection and maintenance of all tank surfaces and hull structure; but shall not
normally be less than 15 inches except
in way of web frames or similar major
structural members where the minimum clearance shall be equal to the
flange or faceplate width.
(3) Access openings. Each tank shall
be provided with at least a 15″ × 18″ diameter manhole, fitted with a cover located above the maximum liquid level
as close as possible to the top of the
tank. Where access trunks are fitted to
tanks, the diameter of the trunks shall
be at least 30 inches.
(4) Low temperature protection. (i)
When low temperature cargoes are to
be carried in gravity type tanks at a
temperature lower than that for which
the hull steel is adequate, a secondary
barrier designed to contain leaked
cargo temporarily shall be provided.
The design of the cargo containment
system shall be such that under normal
service conditions, or upon failure of
the primary tank, the hull structure
shall not be cooled down to a temperature which is unsafe for the materials
involved. The secondary barrier and

structural components of the hull
which may be exposed to low temperatures shall meet the material requirements (i.e., chemistry and physical
properties) specified in part 54 of this
chapter for the service temperature involved. Heat transmission studies and
tests may be required to demonstrate
that the structural material temperatures in the hull are acceptable.
(ii) The design shall take into consideration the thermal stresses induced in
the cargo tank at the service temperature during loading.
(iii) Where necessary, devices for
spray loading or other methods of
precooling or cooling during loading
shall be included in the design.
(iv) Pressure-vessel type tanks shall
be radiographed in accordance with the
requirements of part 54 of this chapter.
For gravity type tanks, all weld intersections or crossings in joints of primary tank shells shall be radiographed
for a distance of 10 thicknesses from
the intersection. All other welding in
the primary tank and in the secondary
barrier, shall be spot radiographed in
accordance with the requirements specified in part 54 of this chapter for Class
II–L pressure vessels.
(v) For nonpressure vessel type containment systems, access shall be arranged to permit inspection one side
each of the primary tank and secondary barrier, under normal shipyard
conditions.
Containment
systems
which, because of their peculiar design,
cannot be visually inspected to this degree, may be specially considered provided an equivalent degree of safety is
attained.
(e) Installation of cargo tanks. (1)
Cargo tanks shall be supported on
foundations of steel or other suitable
material and securely anchored in
place to prevent the tanks from shifting when subjected to external forces.
Each tank shall be supported so as to
prevent the concentration of excessive
loads on the supporting portions of the
shell or head.
(2) Foundations, and stays where required, shall be designed for support
and constraint of the weight of the full
tank, and the dynamic loads imposed
thereon. Thermal movement shall also
be considered.

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§ 151.15–3

(3) Foundations and stays shall be
suitable for the temperatures they will
experience at design conditions.
(4) Cargo tanks may be installed ‘‘on
deck,’’ ‘‘under deck,’’ or with the tanks
protruding through the deck. All tanks
shall be installed with the manhole
openings located in the open above the
weather deck. Provided an equivalent
degree of safety is attained, the Commandant may approve cargo tanks installed with manhole openings located
below the weather deck. Where a portion of the tank extends above the
weather deck, provision shall be made
to maintain the weathertightness of
the
deck,
except
that
the
weathertightness of the upper deck
need not be maintained on:
(i) Vessels operating on restricted
routes which are sufficiently protected;
or,
(ii) Open hopper type barges of acceptable design.
(5) No welding shall be performed on
tanks which require and have been
stress relieved unless authorized by the
Commandant.
(f) Materials. (1) Materials used in the
construction of cargo tanks shall be
suitable for the intended application
and shall be in accordance with the applicable requirements of part 54 of this
chapter. For cargoes carried at low
temperatures, the tank supports and
foundations, and portions of the hull
which may be exposed to low temperature, shall also meet the applicable requirements of that part.
(2) When required, cargo tanks shall
be lined with rubber or other material
acceptable to the Commandant. The interior surfaces of the cargo tanks shall
be made smooth, welds chipped or
ground smooth, and the surfaces thoroughly cleaned before the lining is applied. The lining material shall be resistive to attack by the cargo, not less
elastic than the metal of the tank
proper, and nonporous when tested
after application. It shall be of substantially uniform thickness. The lining shall be directly bonded to the tank
plating, or attached by other satisfactory means acceptable to the Commandant.
(g) Insulation. (1) Insulation, when
provided, shall be compatible with the
cargo and the tank materials.

(2) Insulation in a location exposed to
possible high temperature or source of
ignition shall be one of the following:
(i) Incombustible, complying with
the requirements of Subpart 164.009 of
Part 164 of this chapter; or
(ii) Fire retardant, having a flame
spread rating of 50 or less as determined by ASTM Specification E 84 (incorporated by reference, see § 151.01–2)
(Tunnel Test); or,
(iii)
Nonburning
or
‘‘self-extinguishing’’ as determined by ASTM
Specification D 4986, ‘‘Horizontal Burning Characteristics of Cellular Polymeric Materials’’ (incorporated by reference, see § 151.01–2) and covered by a
steel jacket having a minimum thickness of 18 gauge (0.0428 inches) (U.S.
Standard Gauge) or an equivalent
means of protection acceptable to the
Commandant.
(3) Insulation in a location protected
against high temperature or source of
ignition need satisfy no requirement
for combustibility.
(4) Insulation shall be impervious to
water vapor, or have a vapor-proof
coating of a fire-retardant material acceptable to the Commandant. Unless
the vapor barrier is inherently weather
resistant, tanks exposed to the weather
shall be fitted with a removable sheet
metal jacket of not less than 18 gauge
over the vapor-proof coating and
flashed around all openings so as to be
weathertight. Insulation which is not
exposed to the weather when installed
on tanks carrying cargoes above ambient temperatures need not be impervious to water vapor nor be covered
with a vapor-proof coating.
(5) Insulation shall be adequately
protected in areas of possible mechanical damage.
(h) Fire exposure protection. Tanks
which are provided with fire exposure
protection of one of the following categories may be allowed a reduction in
the size of relief valves.
(1) Approved incombustible insulation meeting the requirements of subpart 164.007 of part 164 of this chapter
which is secured to the tank with steel
bands.
(2) Located in a hold or protected by
a self-supporting steel jacket or cover
(such as a hopper cover) of at least 10
gauge (0.1345) for insulation.

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§ 151.15–5

46 CFR Ch. I (10–1–01 Edition)

(i) Tanks not protected against fire
exposure as described in this paragraph
shall not be permitted a reduction in
size of relief valves.
[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40040, Sept. 29,
1989; USCG–1999–5151, 64 FR 67183, Dec. 1, 1999;
USCG–2000–7790, 65 FR 58463, Sept. 29, 2000]

§ 151.15–5 Venting.
This section contains definitions and
requirements for the various methods
of venting specified in Table 151.05. In
addition to the requirement that all
vents must penetrate into tanks at the
top of the vapor space, the following
methods of venting and the applicable
restrictions are listed:
(a) Open venting. A venting system
which offers no restriction (except pipe
losses and flame screen, where used) to
the movement of liquid or vapor to or
from the cargo tank (via the vent)
under normal operating conditions.
The total cross-sectional area of the
vents shall not be less than the total
cross-sectional area of the filling pipe
or pipes. Ullage openings may be
counted as part of the required crosssectional area: Provided, That each
cargo tank has at least one permanent
vent. The minimum size of a cargo
tank vent shall be not less than 21⁄2
inches. The outlet end of the vent shall
terminate in a gooseneck bend and
shall be located at a reasonable height
above the weather deck, clear of all obstructions. No shut-off valve or frangible disk shall be fitted in the vent
lines except that a float check valve
may be installed so as to exclude the
entry of water into the tank (i.e., to
prevent downflooding). An open venting system may be fitted with a flame
screen.
(b) Pressure-vacuum venting. A normally closed venting system fitted
with a device to automatically limit
the pressure or vacuum in the tank to
design limits. Pressure-vacuum relief
valves shall comply with the requirements of subpart 162.017 of this chapter.
The required capacity of the venting
system shall be in accordance with
part 54 of this chapter.
(c) Safety relief venting. A closed venting system fitted with a device to automatically limit the pressure in the
tank to below its maximum allowable

working pressure. The maximum safety
relief valve setting shall not exceed the
maximum allowable working pressure
of the tank. For cargoes carried at ambient temperatures, the minimum safety relief valve setting shall correspond
to the saturated vapor pressure of the
cargo at 105 °F if carried in an insulated tank, or 115 °F if carried in an
uninsulated tank. For cargoes carried
below ambient temperature, the safety
relief valve setting shall be selected to
provide a suitable margin between normal operating pressure of the tank and
the opening pressure of the valve but in
no case shall it exceed the maximum
allowable working pressure of the
tank. The safety relief valves shall be
of a type approved under subparts
162.001 or 162.018 of subchapter Q of this
chapter. The required capacity of the
safety relief valves shall be in accordance with the requirements of part 54
of this chapter.
(d) Rupture disks. (1) When required
by the nature of the cargo, rupture
disks may be installed in lieu of or in
addition to other pressure limiting devices in accordance with the requirements of § 54.15–13 of this chapter.
(2) When a pressure-vacuum relief
valve or safety relief valve normally
protected by a rupture disk or breaking
pin device is exposed to the cargo due
to breakage of the disk, the valve shall
be reinspected before being returned to
service.
§ 151.15–6 Venting piping.
(a) The back pressure in the relief
valve discharge lines shall be taken
into account when determining the
flow capacity of the relief valve to be
used. The back pressure in the discharge line shall be limited to 10 percent of the valve operating pressure or
a compensating-type valve shall be
used. Suitable provision shall be made
for draining condensate which may accumulate in the vent piping.
(b) [Reserved]
§ 151.15–10 Cargo gauging devices.
This section contains definitions and
requirements for types of gauging devices specified in Table 151.05.
(a) Open gauging. A gauging method
which uses an opening in the cargo
tank and which may expose the gauge

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§ 151.20–1

user to the cargo and its vapors. Examples of this type are gauge hatch,
ullage hole.
(b) Restricted. A gauging device which
penetrates the cargo tank and which,
in operation, causes or permits the release to the atmosphere of small quantities of cargo vapor or liquid. The
amount of cargo released is controlled
by the small diameter of the tank penetration opening and by a locally operated valve or similar closure device in
that opening. When not in use, this
type gauging device is closed to maintain the complete integrity of cargo
containment. Examples of this type are
rotary tube, fixed tube, slip tube,
sounding tube. (See §§ 151.03–43 and
151.15–10(g).)
(c) Closed. A gauging device which
penetrates the cargo tank, but which is
part of a closed system maintaining
the complete integrity of cargo containment. This device is designed and
installed so as not to release cargo liquid or vapor in any amount to the atmosphere. Examples of this type are
automatic float, continuous tape (magnetic coupled), sight glass (protected),
electronic probe, magnetic, differential
pressure cell.
(d) Isolated or indirect. A gauging
method or device which is isolated
from the tank (no penetration of the
tank shell) and which may employ an
indirect measurement to obtain the desired quantity. Examples of this type
are weighing of cargo, sonic depth
gauge (without penetration of tank
shell), pipe flow meter.
(e) All gauging devices and related
fixtures which form a part of the cargo
containment barrier shall be of suitable material and shall be designed for
the pressure and temperature of the
cargo in accordance with the requirements of Subchapter F of this chapter.
(f) Use of restricted gauging devices. (1)
When required in Table 151.05, cargoes
carried under pressure shall have restricted gauging devices designed so
that the maximum bleed valve opening
is not larger than 0.055;inch; diameter,
unless provided with an excess flow
valve. Sounding tubes are prohibited
for use with cargoes having a vapor
pressure in excess of 14.7 p.s.i.a. at 115
°F, if carried in an uninsulated tank, or

at 105 °F, if carried in an insulated
tank.
(2) When utilizing a sounding tube,
the cargo tank vent system shall be designed to prevent the discharge of
cargo through the sounding tube due to
pressure build up in the cargo tank
vapor space. (See § 151.03–43) When cargoes carried at atmospheric pressure
are required to have a restricted gauging device, open gauges may be provided in addition to restricted gauges
for this type of cargo. However, open
gauges may not be used while cargo
transfer operations are actually being
performed.
(g) Fixed tube gauges are not acceptable as primary means of gauging.
They may be used as a check on the
calibration of other gauging devices.
(h) For pressure-vessel type tanks,
each automatic float, continuous reading tape or similar type gauge not
mounted directly on the tank or dome
shall be fitted with a shutoff device located as close to the tank as practicable. When an automatic float gauging device, which gauges the entire
height of the tank, is used, a fixed tube
gauge set in the range of 85 percent to
90 percent of the water capacity of the
tank shall be provided in addition as a
means of checking the accuracy of the
automatic float gauge, or other alternate means acceptable to the Commandant may be used.
(i) Gauge glasses of the columnar
type are prohibited.
(j) Flat sight glasses may be used in
the design of automatic float continuous reading tape gauges. However
such glasses shall be made of high
strength material, suitable for the operating temperatures, of not less than
one-half inch in thickness and adequately protected by a metal cover.

Subpart 151.20—Cargo Transfer
§ 151.20–1

Piping—general.

(a) Cargo piping systems shall be arranged and fabricated in accordance
with this section and Subchapter F.
The class of piping system required for
a specific cargo shall be as listed in
Table 151.05 as a minimum; however, a
higher class may be required when the
actual service temperature or pressure

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§ 151.20–1

46 CFR Ch. I (10–1–01 Edition)

so dictates. See Table 56.04–2 of this
chapter.
(b) Piping system components shall
be suitable for use with the cargoes for
which the barge is certificated, and
shall be of materials listed in Subchapter F of this chapter, or such other
material as the Commandant may specifically approve. All piping materials
shall be tested in accordance with the
requirements of Subchapter F of this
chapter. The valve seat material, packing, gaskets, and all other material
which comes into contact with the
cargo shall be resistant to the chemical
action of the cargoes for which the
barge is certificated.
(c) Cargo piping systems, when subject to corrosive attack of the cargo,
and when serving cargo tanks which
are required by this subchapter to be
lined or coated, shall be constructed of,
lined or coated with corrosion-resistant material. Vent systems shall be
similarly constructed, lined, or coated
up to and including the vent control
device.
(d) All piping systems components
shall have a pressure rating at operating temperature (according to the
applicable American National Standards Institute, Inc., pressure/temperature relations) not less than the maximum pressure to which the system
may be subjected. Piping which is not
protected by a relief valve, or which
can be isolated from its relief valve,
shall be designed for the greatest of:
(1) The cargo vapor pressure at 115
°F.
(2) The maximum allowable working
pressure of the cargo tank.
(3) The pressure of the associated
pump or compressor relief valve.
(4) The total discharge head of the associated pump or compressor where a
discharge relief valve is not used.
The escape from cargo piping system
relief valves shall be run to venting
system or to a suitable recovery system. Provisions shall be made for pressure relief of all piping, valves, fittings, etc., in which excessive pressure
build-up may occur because of an increase in product temperature.
(e) Provisions shall be made by the
use of offsets, loops, bends, expansion
joints, etc., to protect the piping and
tank from excessive stress due to ther-

mal movement and/or movements of
the tank and hull structure. Expansion
joints shall be held to a minimum and
where used shall be subject to individual approval by the Commandant.
(f) Low temperature piping shall be
isolated from the hull structure. Where
necessary, arrangements to provide for
the protection of the hull structure
from leaks in low temperature systems
in way of pumps, flanges, etc., shall be
provided.
(g) Connections to tanks shall be protected against mechanical damage and
tampering. Underdeck cargo piping
shall not be installed between the outboard side of cargo containment spaces
and the skin of the barge, unless provision is made to maintain the minimum
inspection and collision protection
clearances (where required) between
the piping and the skin. Cargo piping
which is external to tanks, and is installed below the weather deck shall be
joined by welding, except for flanged
connections to shutoff valves and expansion joints.
(h) Piping shall enter independent
cargo tanks above the weatherdeck, either through or as close to the tank
dome as possible.
(i) Horizontal runs of cargo piping on
integral tank barges may be run above
or below the weatherdeck. When run
below the weatherdeck, the following
are applicable:
(1) Horizontal runs located entirely
within integral cargo tanks shall be
fitted with a stop valve, located inside
the tank that is being serviced and operable from the weatherdeck. There
shall be cargo compatibility in the
event of a piping failure.
(2) Horizontal runs of cargo piping installed in pipe tunnels may penetrate
gravity
type
tanks
below
the
weatherdeck: Provided, That each penetration is fitted with a stop valve operable from the weatherdeck. If the tunnel is directly accessible from the
weatherdeck without penetrating the
cargo tank, the stop valve shall be located on the tunnel side. If the tunnel
is not accessible from the weatherdeck,
the valve shall be located on the tank
side of the penetration.

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§ 151.20–5

(3) The tunnel shall comply with all
tank requirements for construction, location, ventilation, and electrical hazard. There shall be cargo compatibility
in the event of a piping failure.
(4) The tunnel shall have no other
openings except to the weatherdeck or
a cargo pumproom.
§ 151.20–5 Cargo system valving requirements.
For the purpose of adequately controlling the cargo, both under normal
operating and casualty conditions,
every cargo piping system shall be provided with one of the following sets of
control valves and meet the requirements listed below. Cargo tanks,
whether gravity or pressure vessel
type, for cargoes having a saturated
vapor pressure of 10 pounds per square
inch gauge or less at 115 °F (105 °F if
the tank is insulated) shall be provided
with a valving system designated as
Gravity–1. Cargo tanks, whether gravity or pressure vessel type, for cargoes
which are carried below ambient temperature and whose vapor pressure is
maintained at 10 pounds per square
inch gauge or below shall be provided
with a valving system designated as
Gravity–2. Cargo tanks for cargoes
which have vapor pressures above 10
p.s.i.g. at 115 °F (105 °F if tank is insulated) shall be provided with a valving
system designated as Pressure–1. Cargo
tanks for cargoes which have vapor
pressures above 10 pounds per square
inch gauge at 115 °F (105 °F if tank is
insulated) and which require greater
protection due to their hazardous characteristics shall be provided with a
valving system designated as Pressure–
2. The requirements of paragraphs (a)
through (d) of this section for stop
valves or excess flow valves to be fitted
at tank penetrations are not applicable
to nozzles at which pressure vacuum or
safety relief valves are fitted.
(a) Gravity–1 (G–1). (1) One manually
operated stop valve shall be installed
on each tank filling and discharge line,
located near the tank penetration.
(2) One stop valve or blind flange
shall be installed at each cargo hose
connection. When a cargo hose connection is in use, it shall be provided with
a stop valve; which may be part of the
vessel’s equipment or may be part of

the shore facility and attached to the
barge end of the loading hose. When a
cargo hose connection is not in use, it
may be secured with a blind flange.
(3) If individual deepwell pumps are
used to discharge the contents of each
cargo tank, and the pumps are provided
with a remote shutdown device, a stop
valve at the tank is not required on the
tank discharge line.
(b) Gravity–2 (G–2). (1) One manually
operated stop valve shall be installed
on each tank penetration, located as
close as possible to the tank.
(2) One remote operated, quick closing shut-off valve shall be installed at
each cargo hose connection.
(3) A remote shutdown device shall be
installed for all cargo handling machinery.
(c) Pressure–1 (P–1). (1) One manually
operated stop valve and one excess flow
valve shall be installed on each tank
penetration, located as close as possible to the tank.
(2) One manually operated stop valve
shall be installed at each cargo hose
connection, when in use.
(d) Pressure–2 (P–2). (1) One manually
operated stop valve and one excess flow
valve shall be installed at each tank
penetration, located as close as possible to the tank.
(2) One remote operated quick closing shutoff valve shall be installed at
each cargo hose connection when in
use.
(3) No tank penetration shall be less
than 1 inch diameter.
(e) Cargo tank penetrations which
are connections for gauging or measuring devices need not be equipped
with excess flow or remote operated
quick closing valves provided that the
opening is constructed so that the outward flow of tank contents shall not
exceed that passed by a No. 54 drill size
(0.055–inch diameter).
(f) The control system for any required quick closing shutoff valves
shall be such that the valves may be
operated from at least two remote locations on the vessel; if means of fire
protection is required by Table 151.05,
the control system shall also be provided with fusible elements designed to
melt between 208 °F and 220 °F, which
will cause the quick closing shutoff
valves to close in case of fire. Quick

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§ 151.20–10

46 CFR Ch. I (10–1–01 Edition)

closing shutoff valves shall be of the
fail-closed (closed on loss of power)
type and be capable of local manual operation. Quick closing shutoff valves
shall operate from full open to full
closed under all service conditions in
not more than 10 seconds, without
causing excessive pressure surges.
(g) Excess flow valves, where required, shall close automatically at the
rated closing flow of vapor or liquid as
tested and specified by the manufacturer. The piping, including fittings,
valves, and appurtenances protected by
an excess flow valve, shall have a
greater capacity than the rated closing
flow of the excess flow valve. Excess
flow valves may be designed with a bypass not to exceed 0.040–inch diameter
opening to allow equalization of pressure, after an operating shutdown.
(h) Suitable means shall be provided
to relieve the pressure and remove liquid contents from cargo lines and hoses
to the cargo tank or other safe location
prior to effecting disconnections.
§ 151.20–10 Cargo system instrumentation.
(a) Each tank operated at other than
ambient temperature shall be provided
with at least one remote reading temperature sensor located in the liquid
phase of the cargo. The temperature
gauge shall be located at the cargo
handling control station or another approved location.
(b) Where required, each tank
equipped with safety relief valves shall
be fitted with a pressure gauge which
shall be located at the cargo handling
control station or at another approved
location.
§ 151.20–15 Cargo hose if carried on
the barge.
(a) Liquid and vapor line hose used
for cargo transfer shall be of suitable
material resistant to the action of the
cargo. Hose shall be suitable for the
temperatures to which it may be subjected and shall be acceptable to the
Commandant.
(b) Hose subject to tank pressure, or
the discharge pressure of pumps or
vapor compressors, shall be designed
for a bursting pressure of not less than
5 times the maximum safety relief
valve setting of the tank, pump, or

compressor, whichever determines the
maximum pressure to which the hose
may be subjected in service.
(c) Each new type of cargo hose, complete with end fittings, shall be prototype tested to a pressure not less than
five times its specified maximum working pressure. The hose temperature
during this prototype test shall duplicate the intended extreme service temperature. Thereafter, each new length
of cargo hose produced shall be
hydrostatically tested at ambient temperature to a pressure not less than
twice its maximum working pressure
nor more than two-fifths its bursting
pressure. The hose shall be marked
with its maximum working pressure,
and if used in other than ambient temperature service, its maximum or minimum temperature.
§ 151.20–20

Cargo transfer methods.

(a) Cargo transfer may be accomplished by means of gravity, pumping,
vapor or gas pressurization, or fluid
displacement unless otherwise provided
in Subpart 151.50 of this part.
(b) Vapor or gas pressurization may
be used only in transferring cargo from
pressure vessel type cargo tanks. The
pressurizing vapor or gas lines shall be
provided with safety relief device in
the lines set to open at a pressure no
greater than 90 percent of the set pressure of the cargo tank safety relief
valve. The pressurizing line shall be
fitted with a stop valve at the tank,
and a check valve to prevent the accidental release of cargo through the
pressure line.
(c) Fluid displacement is permitted
with either gravity or pressure vessel
type cargo tanks. The displacing fluid
shall enter the tank under low relative
pressure. The fluid entry line shall be
fitted with a safety relief valve set to
lift at a pressure no higher than 80 percent of the cargo tank safety relief
valve setting.
(d) When cargo vapors are flammable,
combustible or toxic, cargo filling lines
entering the top of the tank shall lead
to a point at or near the bottom. Spray
filling lines, discharging near the top
of the tank, may be fitted in lieu of, or
in addition to, the above cargo filling
lines.

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§ 151.40–1

Subpart 151.25—Environmental
Control
§ 151.25–1

Cargo tank.

When carrying certain commodities
regulated by this subchapter, one of
the following types of cargo protection
may be required, within the main cargo
tank, and in some cases, in the space
between the primary and secondary
barriers.
(a) Inerted. All vapor spaces within
the cargo tank are filled and maintained with a gas or vapor which will
not support combustion and which will
not react with the cargo.
(b) Padded. All vapor spaces within
the cargo tanks are filled and maintained with a liquid, gas (other than
air), or vapor which will not react with
the cargo.
(c) Ventilated (forced). Vapor space
above the liquid surface in the tank is
continuously swept with air by means
of blowers or other mechanical devices
requiring power.
(d) Ventilated (natural). Vapor space
above the liquid surface in the tank is
continuously swept with atmospheric
air without the use of blowers or other
mechanical devices requiring power
(e.g., ‘‘chimney-effect’’ ventilation).
(e) Dry. All vapor space within the
cargo tank is filled and maintained
with a gas or vapor containing no more
than 100 ppm water.
[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40040, Sept. 29,
1989]

§ 151.25–2

Cargo handling space.

Pump rooms, compressor rooms, refrigeration rooms, heating rooms, instrument rooms or other closed spaces
regularly entered by operating personnel, in which work is performed on
the cargo or in which the cargo movement is locally controlled, may be required to be fitted with one of the following types of ventilation:
(a) Forced ventilation. The forced ventilation system shall be designed to insure sufficient air movement through
these spaces to avoid the accumulation
of toxic or flammable vapors and to insure sufficient oxygen to support life,
and, in any event, the ventilation system shall have a minimum capacity

sufficient to permit a change of air
every 3 minutes.
(b) Natural ventilation. The natural
ventilation system shall be designed to
insure sufficient air movement to
avoid the accumulation of toxic or
flammable vapors and to insure sufficient oxygen to support life.

Subpart 151.30—Portable Fire
Extinguishers
§ 151.30–1

Type.

When required by Table 151.05, approved portable fire extinguishers shall
be installed in accordance with Subpart 34.50 of this chapter. The fire extinguishing media shall be dry chemical or other suitable agent for all locations.

Subpart 151.40—Temperature or
Pressure Control Installations
§ 151.40–1

Definitions.

This section defines the various
methods by which the cargo may be
heated or cooled.
(a) Boiloff. Cargo pressure and temperatures are maintained by permitting the cargo to boil naturally and the
cargo vapor thus generated removed
from the tank by venting.
(b) External cargo cooling—(1) Cargo
vapor compression. A refrigeration system in which the cargo vapors generated within the tank are withdrawn,
compressed, and the lower energy
vapor or its condensate returned to the
tank.
(2) External heat exchange. A refrigeration system in which the cargo
vapor or liquid is cooled outside the
cargo tanks by being passed through a
heat exchanger. Refrigeration is not
accomplished by direct compression of
the cargo.
(c) Internal heat exchange. A refrigeration system in which a cooling fluid
is passed through heat transfer coils
immersed in the cargo tank liquid or
vapor phases.
(d) Tank refrigeration. A refrigeration
system in which the cooling fluid is
passed around the cargo tank exterior
in order to remove heat from the tank
or its surroundings.

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§ 151.40–2

46 CFR Ch. I (10–1–01 Edition)

(e) No refrigeration. A system that allows the liquefied gas to warm up and
increase in pressure. The insulation
and tank design pressure shall be adequate to provide for a suitable margin
for the operating time and temperatures involved.
(f) Tank heating. (1) A system in
which the cargo is heated by means of
steam or other heat transfer fluid running through coils within or around
the tank. The cargo itself does not
leave the tank.
(2) A recirculating system in which
the cargo leaves the tank, is pumped
through a heater and then returned to
the tank.
§ 151.40–2 Materials.
Materials used in the construction of
temperature or pressure control systems shall be suitable for the intended
application and meet the requirements
of Subchapter F and the Special Requirements section of this subchapter.
§ 151.40–5 Construction.
Construction of machinery or equipment, such as heat exchangers, condensers, piping, etc., associated with
temperature or pressure control systems shall meet the requirements of
Subchapter F of this chapter. The electrical portions of these installations
shall meet the requirements of Subchapter J of this chapter.
§ 151.40–10 Operational requirements.
Control systems, required by Table
151.05 shall be provided with an audible
or visual high cargo temperature or
high cargo pressure alarm which is discernible at the towboat. The alarm
shall operate when either the pressure
or the temperature exceeds the operating limits of the system. The alarm
may monitor either pressure or temperature, but must be independent of
the control system.
§ 151.40–11 Refrigeration systems.
(a) Boiloff systems. The venting of
cargo boiloff to atmosphere shall not
be used as a primary means of temperature or pressure control unless specifically authorized by the Commandant.
(b) Vapor compression, tank refrigeration, and secondary refrigeration
systems: The required cooling capacity

of refrigeration systems shall be sufficient to maintain the cargo at design
operating conditions with ambient
temperature of 115 °F still air and 90 °F
still water. The number and arrangement of compressors shall be such that
the required cooling capacity of the
system is maintained with one compressor inoperative. Portions of the
system other than the compressors
need not have standby capacity.

Subpart 151.45—Operations
§ 151.45–1

General.

(a) Barges certificated as tank barges
(Subchapter D of this chapter) or cargo
barges (Subchapter I of this chapter)
for the carriage of cargoes regulated by
this subchapter shall meet all applicable requirements for operations in the
appropriate subchapter; in addition, requirements prescribed in this subpart
shall apply to either type of certification.
(b) [Reserved]
§ 151.45–2 Special
ments.

operating

require-

(a) The requirements of this section
shall apply to all barges carrying in
bulk any cargoes regulated by this subchapter; however, the provisions of this
section are not applicable to such
barges when empty and gas-freed.
(b) When it is necessary to operate
box or square-end barges as lead barges
of tows, the person in charge of the
towing vessel shall control the speed to
insure protection against diving and
swamping of such barges, having due
regard to their design and freeboard,
and to the operating conditions.
(c) No cargo tank hatch, ullage hole,
or tank cleaning openings shall be
opened or remain open except under
the supervision of the person in charge,
except when the tank is gas free.
(d) Barges, when tendered to the carrier for transportation, shall have all
bilges and void spaces (except those
used for ballasting) substantially free
of water. Periodic inspections and necessary pumping shall be carried out to
insure maintenance of such water-free
condition in order to minimize the free
surface effects, both in longitudinal
and transverse directions. Except when

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§ 151.45–2

otherwise considered necessary for inspection or pumping, all hatch covers
and other hull closure devices for void
spaces and hull compartments other
than cargo spaces shall be closed and
secured at all times.
(e) Cargo signs and cards. (1) Warning
signs shall be displayed on the vessel,
port and starboard, facing outboard
without obstructions, at all times except when the vessel is gas free. The
warning sign shall be rectangular and a
minimum of 3 feet wide and 2 feet high.
It shall be of sufficient size to accommodate the required alerting information, which shall be shown in black
block style letters and numerals (characters) at least 3 inches high on a
white background. The minimum spacing between adjacent words and lines of
characters shall be 2 inches. The minimum spacing between adjacent characters shall be one-half inch. All characters shall have a minimum stroke
width of one-half inch and shall be a
minimum of 2 inches wide, except for
the letters ‘‘M’’ and ‘‘W’’, which shall
be a minimum of 3 inches wide, and except for the letter ‘‘I’’ and the Numeral
‘‘1’’, which may be 1⁄2–inch wide. The
signs shall have a 2–inch minimum
white border clear of characters. The
signs shall be maintained legible. The
alerting information shall include the
following:
WARNING
DANGEROUS CARGO
(This sign may be covered or removed
when Subchapter O commodities are not
being carried.)
NO VISITORS
NO SMOKING
(This sign may be removed or covered
when the commodity is not flammable or
combustible.)
NO OPEN LIGHTS
(This sign may be removed or covered
when the commodity is not flammable or
combustible.)

(2)(i) Names and locations of all cargoes will be displayed in a readily discernible manner on all barges carrying
one or more commodities regulated by
this subchapter. This may be an individual sign at or on each tank or by a

single sign similar to the following example:
Tank No.

Cargo

IP ................................................................................
IS ................................................................................
2P ...............................................................................
2S ...............................................................................

/xxxx/
/xxxx/
/xxxx/
/xxxx/

These signs may be printed, handwritten, permanent or changeable, but
be visible and readable at all times.
These signs should be as readable, as
those specified in paragraph (e)(1) of
this section. Cargoes regulated by
other subchapters will be included
whenever carried simultaneously with
commodities regulated by this subchapter.
(ii) When the dangerous cargo barge
is carrying only a single product, the
Warning Sign required by paragraph
(e)(1) of this section can be considered
as meeting the requirements for the
cargo location sign. The name of the
commodity shall be added to the Warning Sign.
(3) A cargo information card for each
cargo regulated by this subchapter
shall be carried on the bridge or in the
pilot house of the towing vessel, readily available for use by the person in
charge of the watch. This information
card shall also be carried aboard the
barge, mounted near the Warning Sign
required by paragraph (e)(1) of this section, in such position as to be easily
read by a man standing on the deck of
the barge. The minimum card size shall
be 7″ × 91⁄2″. The card shall have legible
printing on one side only. The card
shall be laminated in clear plastic or
otherwise made weatherproof. The following data shall be listed:
(i) Cargo identification and characteristics. Identification of the cargo, as listed in Table 151.05, its appearance and
odor. A statement of the hazards involved and instructions for the safe
handling of the cargo and, as applicable, the need for special cargo environments.
(ii) Emergency procedures. Precautions
to be observed in the event of spills,
leaks, or equipment or machinery
breakdown and/or uncontrolled release
of the cargo into the waterway or atmosphere. Precautions to be observed
in the event of exposure of personnel to
toxic cargoes.

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§ 151.45–3

46 CFR Ch. I (10–1–01 Edition)

(iii) Firefighting procedures. Precautions to be observed in the event of
a fire occurring on or adjacent to the
barge, and enumeration of firefighting
media suitable for use in case of a
cargo fire.
(f) Surveillance. During the time the
cargo tanks contain any amount of liquid or gaseous dangerous cargoes requiring Type I or Type II barge hulls,
the barge shall be under surveillance,
as set forth in this paragraph:
(1) The licensed operator, person in
command, and mate of a vessel towing
a tank barge that need not be manned,
and each of them, shall be responsible
for monitoring the security and integrity of the tank barge and for ensuring
adherence to proper safety precautions.
These responsibilities include, but are
not limited to—
(i) Ensuring that every tank barge
added to the tow has all tank openings
properly secured; has its freeing-ports
and scuppers, if any, unobstructed;
meets any loadline or freeboard requirements; and neither leaks cargo
into the water, voids, or cofferdams nor
leaks water into the tanks, voids, or
cofferdams;
(ii) Ensuring that every tank barge
in the tow is properly secured within
the tow;
(iii) Ensuring that periodic checks
are made of every tank barge in the
tow for leakage of cargo into the
water, voids, or cofferdams and for
leakage of water into the tanks, voids,
or cofferdams;
(iv) Knowing the cargo of every tank
barge in the tow, all hazards associated
with the cargo, and what to do on discovery of a leak;
(v) Ensuring that the crew of the vessel know the cargo of every tank barge
in the tow, all hazards associated with
the cargo, and what to do on discovery
of a leak;
(vi) Reporting to the Coast Guard
any leaks from a tank barge in the tow
into the water, as required by 33 CFR
151.15; and
(vii) Ensuring that the crew of the
vessel and other personnel in the vicinity of the tank barges in the tow follow
the proper safety precautions for tank
vessels, and that no activity takes
place in the vicinity of the barges that
could create a hazard.

(2) A towing vessel engaged in transporting such unmanned barges shall
not leave them unattended. When a
barge is moored, but not gas free, it
shall be under the care of a watchman
who may be a member of the complement of the towing vessel, or a terminal employee, or other person. This
person shall be responsible for the security of the barge and for keeping unauthorized persons off the barge. Such
person shall be provided with, read, and
have in his possession for ready reference the information cards required
by paragraph (e) of this section.
(g) All cargo hatches shall be closed,
dogged down, or otherwise tightly secured.
[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40040, Sept. 29,
1989; CGD 79–116, 60 FR 17158, Apr. 4, 1995]

§ 151.45–3 Manning.
Except as provided for in this section, barges need not be manned unless
in the judgment of the Officer in
Charge, Marine Inspection, such manning is necessary for the protection of
life and property and for safe operation
of the vessel. Vessels requiring manning for safe operation shall be subject
to additional requirements as determined by the Commandant. Towing
vessels, while towing barges which are
not required to be manned, shall be
provided with and have on board the
information card required by § 151.45–
2(e)(3). This card shall be in the possession of the master or person in charge.
§ 151.45–4 Cargo-handling.
(a) On a United States tank barge
subject to inspection—
(1) The owner and operator of the
vessel, and his or her agent, and each
of them, shall ensure that no transfer
of liquid cargo in bulk or cleaning of a
cargo tank takes place unless under
the supervision of a qualified person
designated as the person in charge of
the transfer or the cleaning under Subpart C of 33 CFR part 155.
(2) The person in charge of the transfer shall ensure that enough qualified
personnel are on duty to safely transfer
liquid cargo in bulk or to safely clean
cargo tanks.
(b) Closing of sea and ballast valves.
All sea and ballast valves are to be

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§ 151.45–4

properly aligned and lashed, or sealed
in their correct position prior to beginning cargo transfer operations. Under
no circumstances shall such valves be
secured by locks.
(c) Connecting for cargo transfer. (1)
Movement of the vessel shall be considered when making the cargo connections to insure safe cargo transfer.
Suitable material shall be used in
joints and in couplings when making
connections to insure that they are
tight. Under no circumstances shall
less than three bolts be used in a bolted
flanged coupling.
(2) When cargo connections are supported by the vessel’s tackle, the person in charge of the transfer operations
shall inspect the vessel to insure that
sufficient tackles are used.
(3) Pans or buckets shall be placed
under cargo hose connections.
(4) Cargo transfer operations for any
cargo requiring a PV or safety relief
venting device in Table 151.05 shall be
performed with cargo hatch covers
closed.
(d) Inspection prior to transfer of cargo.
Prior to the transfer of cargo, the person in charge of the transfer operation
shall inspect the barge and other cargo
equipment to assure himself that the
following conditions exist:
(1) The Certificate of Inspection is
endorsed for the products to be loaded.
Loading restrictions, if any, should be
noted.
(2) Warning signs are displayed as required.
(3) Cargo information cards for the
product are aboard.
(4) No repair work in way of cargo
space is being carried out.
(5) Cargo connections and hatch covers conform with the provisions of
paragraph (c) of this section and cargo
valves are properly set.
(6) All connections for cargo transfer
have been made to the vessel’s fixed
pipeline system.
(7) In transferring flammable or combustible cargoes, there are no fires or
open flames present on the deck, or in
any compartment which is located on,
facing, open or adjacent to the part of
the deck on which cargo connections
have been made.

(8) The shore terminal or other tank
vessel concerned has reported itself in
readiness for transfer of cargo.
(9) All sea valves are properly set and
those connected to the cargo piping are
closed.
(10) When transferring flammable or
combustible cargoes that a determination was made as to whether or not
boiler and/or galley fires can be maintained with reasonable safety.
(e) Duties of the person in charge during transfer operations. The person in
charge of the transfer operations shall
control the operations as follows:
(1) Supervise the operation of the
cargo system valves.
(2) Start transfer of cargo slowly.
(3) Observe cargo connections and
hose for leakage.
(4) Observe operating pressure on
cargo systems.
(5) Comply with loading limitations
placed on the vessel by the Certificate
of Inspection, if, any, for the purpose of
not overloading individual tanks or the
vessel.
(6) Observe the loading rate for the
purpose of avoiding overflow of the
tanks.
(f) Cargo transfer operations shall
not be started or, if started, shall be
discontinued under the following conditions:
(1) During severe electrical storms.
(2) If a fire occurs on the barge, the
wharf or in the immediate vicinity.
(3) If potentially dangerous leakage
occurs.
(g) No vessel shall come alongside or
remain alongside a barge in way of its
cargo tanks while it is transferring
cargo unless the conditions then prevailing are mutually acceptable to the
persons in charge of cargo handling.
(h) Auxiliary steam, air, fuel, or electric
current. When discharging cargo from
one or more barges, the towing vessel
may furnish steam, air, fuel, or electric
current for pumps on barges or dock,
but in no case shall the cargo pass
through or over the towing vessel.
(i) Termination of transfer operations.
When transfer operations are completed, the valves on cargo connections
on the vessel shall be closed. The cargo
connections shall be drained of cargo.
(j) Transfer of other cargo or stores on
a barge. (1) Packaged goods, freight,

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§ 151.45–5

46 CFR Ch. I (10–1–01 Edition)

and ship’s stores shall not be loaded or
discharged during the loading of flammable cargoes except by permission of
the person in charge of the transfer operation. Explosives shall not be loaded
or carried on any barge containing
products regulated by this subchapter.
(2) Where package and general cargo
is carried directly over bulk cargo
tanks, it shall be properly dunnaged to
prevent chafing of metal parts and securely lashed or stowed.
(k) Transportation of other cargo or
stores on barges. Barges may be permitted to transport deck cargoes directly over bulk cargo spaces when the
nature of such deck cargoes and the
methods of loading and unloading same
do not create an undue hazard. Such
barges shall have their decks properly
dunnaged to prevent chafing between
the steel parts of the vessel and the
deck cargo.
(l) Deck construction must be adequate to support the intended load.
Provisions for carrying deck cargo
shall be endorsed on the Certificate of
Inspection by the Officer in Charge,
Marine Inspection.
(m) Emergencies. In case of emergencies, nothing in the regulations in
this subchapter shall be construed as
preventing the person in charge of
transfer operations from pursuing the
most effective action in his judgment
for rectifying the conditions causing
the emergency.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970; 35 FR
6431, Apr. 22, 1970, as amended by CGD 75–59,
45 FR 70273, Oct. 23, 1980; CGD 81–059, 54 FR
151, Jan. 4, 1989; CGD 79–116, 60 FR 17158, Apr.
4, 1995]

§ 151.45–5 Open hopper barges.
(a) All open hopper barges not constructed or modified in conformance
with the provisions of Subpart 151.10 of
this part when carrying in bulk any
cargoes regulated by this subchapter
shall meet the provisions of this section. However, the provisions of this
section are not applicable to such
barges when empty (not necessarily
cleaned or gas-freed).
(1) Except as otherwise provided in
this section, no such open hopper type
barge shall be placed as lead barge in
any tow. These barges shall be placed
in protected positions within the tow

so that the danger from diving or
swamping will be minimized. Where,
due to operating conditions, compliance with this paragraph is impossible,
the provisions of paragraph (a)(3) of
this section apply. The person in
charge of the towing vessel shall be responsible for compliance with this
paragraph.
(2) No such open hopper type barge
shall be moved from a loading facility
unless all void spaces and bilges are
substantially free of water. Periodic inspections and necessary pumping shall
be carried out to insure the maintenance of such water-free conditions, in
order to minimize the free surface effect in both the longitudinal and transverse directions. Except when considered necessary for inspection or pumping, all hatch covers and other hull closure devices for void spaces and hull
compartments shall be closed and secured at all times. In the case of unmanned barges, the person in charge of
the towing vessel shall be deemed to be
in charge of the barge, and all requirements to be carried out on the barge
shall be carried out by or under the direction of this person.
(3) When an open hopper type barge is
in an exposed position, such that protection from swamping provided by adjoining barges cannot be obtained from
the location within the tow, it shall be
the responsibility of the person in
charge of the towing vessel to control
speed so as to insure protection against
diving and swamping of the barge, having regard to its design and freeboard,
and other operating conditions.
(b) To show that special operating requirements apply to a specific open
hopper type barge, additional placards
or signs shall be displayed in at least
four different locations on the barge
when the cargoes subject to this part
are carried in any form in the cargo
tanks. The placards or signs shall be
posted on the barge approximately
amidships on each side and near the
centerline fore and aft facing outboard.
Racks, or other suitable means for
mounting such placards or signs, shall
be so arranged as to provide clear visibility and shall be protected from becoming readily damaged or obscured.
The placards or signs shall be at least

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Coast Guard, DOT

§ 151.50–5

equal in dimensions to the DOT standard tank car ‘‘Dangerous’’ placard (103⁄4
inches square or larger) and shall display a circle (10 inches in diameter or
larger) with alternating quadrants of
white and red, and so mounted that the
red quadrants are centered on the
vertical axis. The shipper and/or owner
of the barge shall be responsible for the
installation of the required placards or
signs, including maintenance of them
while such barge is in temporary storage with cargo aboard. The person in
charge of the towing vessel shall be responsible for the continued maintenance of the placards or signs while
such barge is in transit.
§ 151.45–6 Maximum amount of cargo.
(a) Tanks carrying liquids or liquefied gases at ambient temperatures
regulated by this subchapter shall be
limited in the amount of cargo loaded
to that which will avoid the tank being
liquid full at 105 °F if insulated, or 115
°F if uninsulated. If specific filling densities are designated in Subpart 151.50
of this part, they shall take precedence
over that noted above.
(b) Refrigerated and semirefrigerated
tanks shall be filled so that there is an
outage of at least 2 percent of the volume of the tank at the temperature
corresponding to the vapor pressure of
the cargo at the safety relief valve setting. A reduction in the required outage may be permitted by the Commandant when warranted by special design considerations. Normally, then,
the maximum volume to which a tank
may be loaded is:
VL=0.98drV÷dL
where:
VL=Maximum volume to which tank may
be loaded.
V =Volume of tank.
dr=Density of cargo at the temperature required for a cargo vapor pressure equal
to the relief valve setting.
dL=Density of cargo at the loading temperature and pressure.

§ 151.45–7 Shipping papers.
Each barge carrying dangerous cargo
shall have on board a bill of lading,
manifest, or shipping document giving
the name of shipper, location of the
loading point, and the kind, grade, and
approximate quantity by compartment

of each cargo in the barge. Such manifest or bills of lading may be made out
by the shipper, master of the towing
vessel, owner, or agent of the owner.
However, in the case of unmanned
barges the master of the towing vessel
shall either have a copy of the shipping
papers for each barge in his tow or he
shall make an entry in the towing vessel’s log book giving the name of the
shipper, location where the barge was
loaded, and the kind, grade, and quantity of cargo by compartment in the
barge. The barge shall not be delayed
in order to secure the exact quantities
of cargo.
§ 151.45–8 Illness, alcohol, drugs.
A person who is under the influence
of liquor or other stimulants, or is so
ill as to render him unfit to perform
service shall not be permitted to perform any duties on the barge.
§ 151.45–9 Signals.
While fast to a dock, a vessel during
transfer of bulk cargo shall display a
red flag by day or a red light by night,
which signal shall be so placed that it
will be visible on all sides. When at anchor, a vessel during transfer of bulk
cargo shall display a red flag by day,
placed so that it will be visible on all
sides. This flag may be metallic.

Subpart 151.50—Special
Requirements
EDITORIAL NOTE: Nomenclature changes to
Subpart 151.50 appear at 60 FR 50465, Sept. 29,
1995 and at 61 FR 50732, Sept. 27, 1996.

§ 151.50–1 General.
Special requirements found in this
subpart pertain to specific cargoes and
to similar groups of cargoes. These requirements are in addition to and take
precedence over any other requirements found in these regulations.
§ 151.50–5 Cargoes having toxic properties.
When table 151.05 refers to this section, the following apply:
(a) [Reserved]
(b) Independent tanks shall be designed and tested for a head of at least
8 feet above the top of the tank using
the specific gravity of the product to

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§ 151.50–6

46 CFR Ch. I (10–1–01 Edition)

be carried. In addition, tank design calculations shall demonstrate that the
tank can withstand, without rupture, a
single loading to the highest level to
which the product may rise, if that exceeds 8 feet. In general, plate less than
five-sixteenths inch in thickness shall
not be used in the fabrication of independent tanks unless otherwise approved.
(c)(1) Cargo tanks transporting liquids having a Reid vapor pressure exceeding 14 pounds per square inch absolute or vented at a gauge pressure exceeding 4 pounds per square inch, or
where air or water pressure is used to
discharge the cargo, shall be fabricated
as arc-welded unfired pressure vessels.
(2) Unfired pressure vessel cargo
tanks shall be designed for a pressure
not less than the vapor pressure, in
pounds per square inch gauge, of the
lading at 115 °F, or the maximum air or
water pressure used to discharge the
cargo, whichever is greater, but in no
case shall the design pressure of such
tanks be less than 30 pounds per square
inch gauge.
(d) Piping. (1) The pumps and piping
used for cargo transfer shall be independent of all other piping.
(2) Where multiple cargoes are carried, and the cargo piping conveying
cargoes covered under this section are
led through cargo tanks containing
other products, the piping shall be encased in a tunnel.
(3) Where cargo lines handling other
products, or bilge and ballast piping
are led through tanks containing cargoes covered by this section, the piping
shall be enclosed in a tunnel.
(e) Gravity type cargo tanks shall be
fitted with an approved pressure-vacuum relief valve of not less than 21⁄2-inch
size, which shall be set at a pressure of
not less than 3 pounds per square inch
gauge, but not in excess of the design
pressure of the tank.
(f) The discharge fittings from each
safety relief or pressure vacuum relief
valve shall be directed in such a manner as to not impinge on another tank,
piping or any other equipment which
would increase the fire hazard should
burning products be discharged from
the safety or pressure vacuum relief
valve as a result of a fire or other casualty. In addition, the discharges shall

be directed away from areas where it is
likely that persons might be working
and as remote as practicable from ventilation inlets and ignition sources. A
common discharge header may be employed if desired. The area near the discharge fittings shall be clearly marked
as a hazardous area.
(g) A means shall be provided for either the reclamation or safe venting of
vapors during the loading and unloading operations. For this purpose the
safety relief or pressure vacuum relief
valve shall be provided with a valved
bypass to a vapor return line shore
connection which shall be used whenever vapor return shore facilities are
available. In the event vapors must be
vented to the atmosphere, a vent riser
shall extend at least 12 feet above the
highest level accessible to personnel.
The vent riser may be collapsible for
ease of stowage when not in use. Vapor
return lines or vent risers for tanks
carrying the same class product may
be connected to a common header system if desired. Tanks carrying cargoes
covered by this section shall be vented
independent of tanks carrying other
products.
(h) The pump room ventilation outlet
duct exhausts shall terminate at a distance of at least 6 feet above the enclosed space or pump room and at least
6 feet from any entrance to the interior
part of the vessel. The discharge end of
the exhaust ducts shall be located so as
to preclude the possibility of recirculating contaminated air through the
pump room, or other spaces where personnel may be present.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40040, Sept. 29,
1989]

§ 151.50–6 Motor fuel antiknock compounds.
When transporting motor fuel antiknock compounds containing tetraethyl lead and tetramethyl lead the requirements listed in this section shall
be observed.
(a) Tanks used for these cargoes shall
not be used for the transportation of
any other cargo except those commodities to be used in the manufacture of
tetraethyl lead and tetramethyl lead.
(b) Pump rooms shall be equipped
with forced ventilation with complete

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Coast Guard, DOT

§ 151.50–10

air change every 2 minutes. Air analysis shall be run for lead content to determine if the atmosphere is satisfactory prior to personnel entering the
pump room.
(c) Entry into cargo tanks used for
the transportation of these cargoes is
not permitted.
(d) No internal tank inspection is required. If it is desired to internally inspect tanks used for these cargoes, the
Commandant must be notified in advance before such inspection is made.
(e) The provisions of § 151.50–5 shall
also be met as a requirement for shipping antiknock compounds containing
tetraethyl lead and tetramethyl lead.
§ 151.50–10 Alkylene oxides.
(a) For the purpose of this part, alkylene oxides are considered to be
ethylene oxide and propylene oxide.
(b) Alkylene oxides transported
under the provisions of this part shall
be acetylene free.
(c)(1) No other product may be transported in tanks certified for an alkylene oxide except that the Commandant
may approve subsequent transportation of other products and return to
alkylene oxide service if tanks, piping
and auxiliary equipment are adequately cleaned to the satisfaction of
the Marine Inspector.
(2) Unless authorized by the Commandant, no other kind of cargo except
methane, ethane, propane, butane and
pentane shall be on board a tank vessel
certificated for the carriage of an alkylene oxide at the same time an alkylene oxide in either the liquid or
vapor state is present in any cargo
tank. Alkylene oxide tanks shall not be
installed in tanks intended for any
other cargo.
(d) All valves, flanges, fittings, and
accessory equipment shall be of a type
suitable for use with the alkylene oxides and shall be made of steel or stainless steel, or other materials acceptable to the Commandant. Impurities of
copper,
magnesium
and
other
acetylide-forming metals shall be kept
to a minimum. The chemical composition of all material used shall be submitted to the Commandant for approval prior to fabrication. Disks or
disk faces, seats and other wearing
parts of valves shall be made of stain-

less steel containing not less than 11
percent chromium. Mercury, silver,
aluminum, magnesium, copper, and
their alloys shall not be used for any
valves, gauges, thermometers, or any
similar devices. Gaskets shall be constructed of spirally wound stainless
steel with ‘‘Teflon’’ or other suitable
material. All packing and gaskets shall
be constructed of materials which do
not react spontaneously with or lower
the autoignition temperature of the alkylene oxides.
(e) The pressure rating of valves, fittings, and accessories shall be not less
than the maximum pressure for which
the cargo tank is designed, or the shutoff head of the cargo pump, whichever
is greater, but in no case less than 150
pounds per square inch. Welded fittings
manufactured in accordance with
A.N.S.I. Standards shall be used wherever possible, and the number of pipe
joints shall be held to a minimum.
Threaded joints in the cargo liquid and
vapor lines are prohibited.
(f) The thermometer shall terminate
in the liquid space and shall be attached to the shell by welding with the
end of the fitting being provided with a
gastight screwed plug or bolted cover.
(g) Automatic float continuous reading tape gauge, and similar types, shall
be fitted with a shutoff valve located as
close to the tank as practicable, which
shall be designed to close automatically in the event of fracture of the external gauge piping. An auxiliary gauging device shall always be used in conjunction with an automatic gauging
device.
(h) Filling and discharge piping shall
extend to within 4 inches of the bottom
of the tank or sump pit if one is provided.
(i) Venting. (1) The discharge fittings
from each safety relief or pressure vacuum relief valve shall be directed in
such a manner as to not impinge on another tank, piping or any other equipment which would increase the fire
hazard should burning products be discharged from the safety or pressure
vacuum relief valve as a result of a fire
or other casualty. In addition, the discharges shall be directed away from
areas where it is likely that persons
might be working and as remote as
practicable from ventilation inlets and

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§ 151.50–10

46 CFR Ch. I (10–1–01 Edition)

ignition sources. A common discharge
header may be employed if desired. The
area near the discharge fittings shall
be clearly marked as a hazardous area.
(2) A means shall be provided for either the reclamation or safe venting of
vapors during the loading and unloading operations. For this purpose, the
safety relief or pressure vacuum relief
valve shall be provided with a valved
bypass to a vapor return line shore
connection which shall be used whenever vapor return shore facilities are
available. In the event vapors must be
vented to the atmosphere, a vent riser
shall be connected to the vapor return
line and extend at least 12 feet above
the highest level accessible to personnel. The vent riser may be collapsible for ease of stowage when not in
use. The vent riser shall not be connected to a safety relief or pressure
vacuum valve. Vapor return lines or
vent risers for tanks carrying the same
class product may be connected to a
common header system if desired.
Tanks carrying alkylene oxides shall
be vented independent of tanks carrying other products.
(3) The outlet of each vent riser shall
be fitted with acceptable corrosion-resistant flame screen of suitable material or a flame arrester suitable for use
with alkylene oxide.
(j) Ventilation. (1) All enclosed spaces
within the hull shall be vented or ventilated in accordance with the provisions of this subchapter except as otherwise provided for in this subpart.
(2) The enclosed spaces in which the
cargo tanks are located shall be inerted
by injection of a suitable inert gas or
shall be well ventilated.
(3) The enclosed spaces in which the
cargo tanks are located, if an inerting
system is not installed, shall be fitted
with forced ventilation of such capacity to provide a complete change of air
every three minutes and arranged in
such a manner that any vapors lost
into the space will be removed. The
ventilation system shall be in operation at all times cargo is being loaded
or discharged. No electrical equipment
shall be fitted within the spaces or
within ten feet of the ventilation exhaust from these spaces.

(4) All ventilation machinery shall be
of nonsparking construction and shall
not provide a source of vapor ignition.
(5) Each vent shall be fitted with a
flame screen of corrosion resistant wire
which is suitable for use with the alkylene oxide.
(k)(1) Flexible metal hose fabricated
of stainless steel or other acceptable
material, resistant to the action of the
alkylene oxide, shall be fitted to the
liquid and vapor lines during cargo
transfer.
(2) The hose shall be marked with the
maximum pressure guaranteed by the
manufacturer, and with his certification with the words ‘‘Certified for
lllll Oxide.’’
(3) Cargo hose intended for alkylene
oxide service shall not be used for any
other products except those which are
compatible with the alkylene oxide.
(l) Vessel shall be electrically bonded
to the shore piping prior to connecting
the cargo hose. This electrical bonding
shall be maintained until after the
cargo hose has been disconnected and
any spillage has been removed.
(m) Cargo shall be discharged by
pumping or by displacement with nitrogen or other acceptable inert gas. In
no case shall air be allowed to enter
the system. During loading and unloading operations, the vapor shall not be
discharged to the atmosphere. Provisions shall be made to return all displaced vapor to the loading facility.
The loading rate and the pressure applied to the tank to discharge the
cargo shall be so limited to prevent
opening the safety relief valves.
(n) During cargo transfer, a water
hose with pressure to the nozzle, when
atmospheric
temperatures
permit,
shall be connected to a water supply
for immediate use during filling and
discharge operations and any spillage
of alkylene oxide shall be immediately
washed away. This requirement can be
met by facilities provided from shore.
(o) Prior to disconnecting shore lines,
the pressure in the liquid and vapor
lines shall be relieved through suitable
valves installed at the loading header.
The liquid and vapor discharged from
these lines shall not be discharged to
atmosphere.
(p) The safety relief valves shall be
tested by liquid, gas, or vapor pressure

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Coast Guard, DOT

§ 151.50–12

at least once every 2 years to determine the accuracy of adjustment and,
if necessary, shall be reset. Alkylene
oxides shall not be used as the testing
medium.
(q) The special requirements for
ethylene oxide contained in § 151.50–12
and for propylene oxide contained in
§ 151.50–13 shall also be observed.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 85–061, 54 FR 50966, Dec. 11,
1989]

§ 151.50–12 Ethylene oxide.
(a)(1) Ethylene oxide shall be carried
in fixed, independent, pressure vessel
type cargo tanks, designed, constructed, arranged and, if necessary,
equipped with machinery to maintain
the cargo temperature below 90 °F except as otherwise provided for in paragraph (a)(3) of this section.
(2) Ethylene oxide shall be loaded at
a temperature below 70 °F.
(3) When ethylene oxide is to be
transported at or near atmospheric
pressure, the Commandant may permit
the use of alternate methods of storage
which are consistent with the minimum requirements of this subpart.
(b)(1) All cargo tanks shall be constructed of a carbon steel or stainless
steel acceptable to the Commandant.
Impurities of copper, magnesium and
other acetylide-forming metals shall be
kept to a minimum. The chemical composition of all steel used shall be submitted to the Commandant for approval prior to fabrication. Aluminum,
copper and other acetylide-forming
metals, such as silver, mercury, magnesium, and their alloys shall not be
used as materials of construction for
tanks or equipment used in handling
ethylene oxide.
(2) Cargo tanks shall meet the requirements of Class I pressure vessels.
(3) Cargo tanks shall be designed for
the maximum pressure of vapor or gas
used in discharging the cargo but in no
case shall the design pressure of such
tanks be less than 75 pounds per square
inch gauge. The tank shell and heads
shall not be less than 5⁄16-inch thick.
(c)(1) Cargo tanks shall be located
below deck in holds or enclosed spaces
with the domes or trunks extended
above the weather deck and terminating in the open. Provisions shall be

made to maintain the watertightness
of the deck by means of watertight
seals around such domes or trunks. The
holds or enclosed spaces, in which the
ethylene oxide tanks are located, shall
not be used for any other purpose. However, in open hopper type barges of a
suitable design approved for such service, the weatherdeck may not be required to be watertight.
(2) All cargo tanks shall be installed
with the manhole openings and all
tank connections located above the
weatherdeck in the open.
(3) Tanks shall be electrically bonded
to the hull.
(4) No welding of any kind shall be
done on cargo tanks or supporting
structure unless authorized by the
Commandant.
(d) All cargo tanks, piping, valves,
fittings, and similar equipment which
may contain ethylene oxide in either
the liquid or vapor phase, including the
vent risers, shall be insulated. Flanges
need not be covered, but if covered, a
small opening shall be left at the bottom of the flange cover to detect leaks.
Insulation shall be of an approved incombustible material suitable for use
with ethylene oxide, which does not
significantly lower the autoignition
temperature and which does not react
spontaneously with ethylene oxide.
The insulation shall be of such thickness as to provide a thermal conductance of not more than 0.075 B.t.u. per
square foot per degree Fahrenheit differential in temperature per hour.
(e)(1) When cooling systems are installed to maintain the temperature of
the liquid below 90 °F, at least two
complete cooling plants, automatically
regulated by temperature variations
within the tanks shall be provided;
each to be complete with the necessary
auxiliaries for proper operation. The
control system shall also be capable of
being manually operated. An alarm
shall be provided to indicate malfunctioning of the temperature controls.
The capacity of each cooling system
shall be sufficient to maintain the temperature of the liquid cargo at or below
the design temperature of the system.
(2) An alternate arrangement may
consist of three cooling plants, any two
of which shall be sufficient to maintain
the temperature of the liquid cargo at

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§ 151.50–13

46 CFR Ch. I (10–1–01 Edition)

or below the design temperature of the
system.
(3) Cooling systems requiring compression of ethylene oxide are prohibited.
(f) In addition to the shutoff valve required, all tank connections larger
than one-half inch inside pipe size, except safety relief valves and liquid
level gauging devices, shall be fitted
with either internal back pressure
check valves or internal excess flow
valves in conjunction with a quick
closing stop valve operable from at
least two remote locations. The quick
closing stop valve shall be of the ‘‘fail
safe’’ type acceptable to the Commandant and shall be equipped with a
fusible plug designed to melt between
208 °F and 220 °F, which will cause the
quick closing valve to close automatically in case of fire. The quick closing
valve shall be located as close to the
tank as possible.
(g) Piping systems intended for
ethylene oxide service shall not be used
for any other product and shall be completely separate from all other systems. The piping system shall be designed so that no cross connections
may be made either through accident
or design.
(h) Each safety relief valve shall be
set to start to discharge at not less
than 75 pounds per square inch gauge,
nor more than the design pressure of
the tank.
(i) The filling density shall not exceed 83 percent.
(j)(1) The cargo shall be shipped
under a suitable protective inerting gas
system, such as nitrogen. When nitrogen gas is used, the gas inerting system
shall be so designed that the vapor
space above the liquid cargo will be
filled and maintained with a gas mixture of not less than 45 percent nitrogen. Other gases proposed for inerting
use may be given consideration by the
Commandant. Original charging only
of protective inerting gas at the loading facility is not considered adequate.
A sufficient amount of spare inerting
gas as approved by the Commandant
shall be provided on the vessel in order
to maintain the proper concentration
of the gas in the event of normal leakage or other losses.

(2) Any inerting gas selected should
be at least 98 percent pure and free of
reactive materials, such as ammonia,
hydrogen sulfide, sulfur compounds,
and acetylene.
(k) Prior to loading, a sample from
the cargo tank will be taken to insure
that the pad gas will meet the requirements of paragraph (j) of this section
and that the oxygen content of the
vapor space will be not more than 2
percent maximum. If necessary, a sample will be taken after loading to insure the vapor space meets this requirement.
(l) The cargo piping shall be inspected and tested at least once in each
2 calendar years.
(m) In those cases where the cargo
transfer hose used is not part of the
barge’s equipment, the person in
charge of the transfer operation shall
determine that the provisions of
§ 151.50–10(k) have been met before
using this hose. A certificate of test,
supplied by the transfer facility, will
be considered as adequate for this determination.
(n) The provisions of § 151.50–10 shall
be complied with as a requirement for
shipping ethylene oxide.
(o) A hydrostatic test of 11⁄2 times the
design pressure shall be made on the
cargo tanks at least once in each 4
years at the time the internal examination is made and at such other
times as considered necessary by the
Officer in Charge, Marine Inspection.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 85–061, 54 FR 50966, Dec. 11,
1989]

§ 151.50–13 Propylene oxide.
(a)(1) Pressure vessel cargo tanks
shall meet the requirements of Class II
pressure vessels.
(2) Cargo tanks shall be designed for
the maximum pressure expected to be
encountered during loading, storing
and discharging the cargo but in no
case shall the design pressure of pressure vessel tanks be less than thirty
(30) pounds per square inch gauge. The
tank shell and heads shall not be less
than 5⁄16-inch thick.
(b) When propylene oxide is carried
on board a vessel, piping systems in
propylene oxide service shall not be
used for any other product and shall be

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§ 151.50–20

completely separate from all other systems. The piping system shall be designed so that no cross connection may
be made through inadvertence.
(c) Each safety relief valve shall be
set to start to discharge at not less
than 30 pounds per square inch gauge,
nor more than the design pressure of
the tank.
(d) Filling density shall not exceed 80
percent.
(e)(1) The cargo shall be shipped
under a suitable protective padding,
such as nitrogen gas. Other gases proposed for use as padding may be given
consideration by the Commandant.
Original charging only of protective
gas padding at the loading facility is
not considered adequate. A sufficient
amount of spare padding gas as approved by the Commandant shall be
provided on the vessel in order to
maintain the proper concentration of
the gas in the event of normal leakage
or other losses.
(2) Any padding gas selected should
be at least 98 percent pure and free of
reactive materials.
(f) Prior to loading, a sample from
the cargo tank will be taken to insure
that the pad gas will meet the requirements of paragraph (e) of this section
and that the oxygen content of the
vapor space will be not more than 2
percent maximum. If necessary, a sample will be taken after loading to insure the vapor space meets this requirement.
(g) The cargo piping shall be subjected to a hydrostatic test of 11⁄2 times
the maximum pressure to which they
may be subjected in service.
(h) The Commandant may permit the
transportation of propylene oxide in
other than pressure vessel type tanks if
it is shown to his satisfaction that a
degree of safety is obtained consistent
with the minimum requirements of
this subpart.
(i) The provisions of § 151.50–10 shall
be complied with as a requirement for
shipping propylene oxide.
§ 151.50–20 Inorganic acids.
(a)(1) Gravity type cargo tanks shall
be designed and tested to meet the
rules of the American Bureau of Shipping for a head of water at least 8 feet
above the tank top or the highest level

the lading may rise, whichever is the
greater. The plate thickness of any
part of the tank shall not be less than
three-eighths inch.
(2) Gravity tank vents. (i) The outlet
end of the gravity tank vent shall terminate above the weatherdeck, clear of
all obstructions and away from any
source of ignition.
(ii) The gravity tank vent shall terminate in a gooseneck bend and shall
be fitted with a single flame screen or
two fitted flame screens as described in
§ 151.03–25. No shutoff valve or frangible
disk shall be fitted in the vent lines.
(b)(1) Pressure vessel type cargo
tanks shall be independent of the vessel’s structure and shall be designed for
the maximum pressure to which they
may be subjected when compressed air
is used to discharge the cargo, but in
no case shall the design pressure be
less than that indicated as follows:
Fluorosilicic Acid—50 pounds per square inch
gauge.
Hydrochloric Acid—50 pounds per square
inch gauge.
Hydrofluorosilicic Acid, see Fluorosilicic Acid.
Phosphoric Acid—30 pounds per square inch
gauge.
Sulfuric Acid—50 pounds per square inch
gauge.

(2) Pressure vessel type cargo tanks
shall be of welded construction meeting the requirements for Class II or
Class III given in Part 54 of this chapter.
(3) When compressed air is used to
discharge the cargo, the tank shall be
fitted with a vent led to the atmosphere in which a rupture disk shall be
installed. The rupture disk shall be designed to burst at a pressure not exceeding the design pressure of the
tank. An auxiliary vent to relieve the
pressure or vacuum in the tank during
the cargo transfer operation may be led
from the vent line between the tank
and the rupture disk. A shutoff valve
may be fitted in the auxiliary vent.
(c) Openings in tanks are prohibited
below deck, except for access openings
used for inspection and maintenance of
tanks, or unless otherwise specifically
approved by the Commandant. Openings shall be fitted with bolted cover
plates and acid-resistant gaskets.

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§ 151.50–21

46 CFR Ch. I (10–1–01 Edition)

(d) Where special arrangements are
approved by the Commandant to permit a pump suction to be led from the
bottom of the tank, the filling and discharge lines shall be fitted with shutoff
valves located above the weatherdeck
or operable therefrom.
(e) The outage shall not be less than
1 percent.
(f) All enclosed compartments containing cargo tanks and all machinery
spaces containing cargo pumps shall be
fitted with effective means of ventilation.
(g) A separator shall be fitted in compressed air lines to the tank when air
pressure is used to discharge the cargo.
(h) Only installed electric or portable
battery lights shall be used during the
cargo transfer operations. Smoking is
prohibited and the person in charge of
cargo transfer shall post No Smoking
signs during cargo transfer operations.
(i) Tanks approved for the transportation of acid cargoes subject to this
section shall not be used for the transportation of any other commodity, except upon authorization by the Commandant (G–MSO).
(j) Each cargo tank shall be subjected
to an internal examination at least
once in every 4 years. If cargo tank lining is required and the lining of the
cargo tank has deteriorated in service
or is not in place, the Marine Inspector
may require the tank to be tested by
such nondestructive means as he may
consider necessary to determine its
condition.
(k) The special requirements for
fluorosilicic acid in § 151.50–77, for hydrochloric acid in § 151.50–22, for
hydrofluorosilicic acid, see fluorosilicic
acid, for phosphoric acid in § 151.50–23,
and for sulfuric acid in § 151.50–21 also
apply to the carriage of those acids.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by GGD 80–001, 46 FR 63279, Dec. 31,
1981; CGD 82–063b, 48 FR 4781, Feb. 3, 1983;
CGD 88–100, 54 FR 40040, Sept. 29, 1989; CGD
92–100, 59 FR 17028, Apr. 11, 1994]

§ 151.50–21 Sulfuric acid.
(a) How sulfuric acid may be carried. (1)
Sulfuric acid of concentration of 77.5
percent (1.7019 specific gravity) (59.8°
Baume´ ) or greater concentrations with
or without an inhibitor, provided the
corrosive effect on steel measured at

100 °F is not greater than that of 66°
Baume´ commercial sulfuric acid, may
be transported in unlined gravity type
cargo tanks or unlined pressure vessel
type cargo tanks.
(2) Sulfuric acid of concentration of
65.25 percent (1.559 specific gravity) (52°
Baume´ ) or greater concentrations, provided the corrosive effect on steel
measured at 100 °F is not greater than
that of 52° Baume´ commercial sulfuric
acid, may be transported in unlined
pressure vessel type cargo tanks independent of the vessel’s structure.
(3) Sulfuric acid of concentration not
to exceed 65.25 percent (1.559 specific
gravity) (52° Baume´ ) may be transported in gravity type cargo tanks or
pressure-vessel type cargo tanks which
are lined with lead or other equally
suitable acid-resistant material acceptable to the Commandant.
(4) Sulfuric acid of concentration not
to exceed 51 percent (1.408 specific
gravity) (42° Baume´ ) and spent sulfuric
acid resulting from the use of sulfuric
acid in industrial processes may be
transported in gravity type cargo
tanks which are lined with rubber or
other equally suitable acid-resistant
material acceptable to the Commandant. See § 151.15–3(f)(2).
(5) Spent or sludge sulfuric acid resulting from the use of sulfuric acid in
industrial processes may be transported in unlined gravity type cargo
tanks or unlined pressure vessel type
cargo tanks, provided the corrosive effect on steel is not greater than that of
commercial sulfuric acid as prescribed
in paragraph (a)(1) of this section.
(b) Heating coils will be the only acceptable means of liquefying frozen or
congealed sulfuric acid.
(c) During cargo transfer, a water
hose shall be connected to a water supply ready for immediate use and any
leakage or spillage of acid shall be immediately washed down. This requirement can be met by facilities provided
from shore.
(d) The requirements of § 151.50–20 are
also applicable to the shipment of sulfuric acid.
§ 151.50–22 Hydrochloric acid.
(a) Hydrochloric acid shall be carried
in gravity or pressure type cargo tanks
which are independent of the vessel’s

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§ 151.50–30

structure provided such tanks are lined
with rubber or other equally suitable
material acceptable to the Commandant. See § 151.15–3(f)(2).
(b) Notwithstanding the provisions of
§ 151.50–20(b)(3), compressed air may be
used to discharge hydrochloric acid
from gravity type cargo tanks only if
the tanks are of cylindrical shape with
dished heads, provided the air pressure
does not exceed the design pressure of
the tank but in no case shall it exceed
10 pounds per square inch gauge. Such
tanks shall be fitted with pressure relief devices and need not be vented to
the atmosphere as required by § 151.50–
20(b)(3).
(c) During cargo transfer, a water
hose shall be connected to a water supply and be ready for immediate use.
Any leakage or spillage of acid shall be
immediately washed down. This requirement can be met by facilities provided from shore.
(d) Spent hydrochloric acid or hydrochloric acid adulterated by other
chemicals, inhibitors, oils, solvents,
water, etc., shall not be transported in
bulk except upon authorization by the
Commandant (G–MSO).
(e) The requirements of § 151.50–20 are
also applicable to the shipment of hydrochloric acid.
[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40040, Sept. 29,
1989]

§ 151.50–23 Phosphoric acid.
(a) The term phosphoric acid as used
in this subpart shall include, in addition to phosphoric acid, aqueous solutions of phosphoric acid, and super
phosphoric acid.
(b) Phosphoric acid may be carried in
either gravity or pressure type cargo
tanks. The tanks shall be rubber-lined,
or lined or clad with other suitable material acceptable to the Commandant,
or shall be fabricated of a phosphoric
acid resistant stainless steel. See
§ 151.15–3(f)(2).
(c) The vessel’s shell plating shall not
be used as any part of the boundaries of
gravity type cargo tanks.
(d) Cargo piping, including valves,
fittings, and flanges where exposed to
the acid, shall be rubber-lined, or lined,
coated or clad with other corrosion-resistant material, or shall be fabricated

of a phosphoric acid resistant stainless
steel. Vent piping, including flanges
and fittings, shall be similarly protected at least to the height of the
flangible disk if such is installed.
(e) Phosphoric acid adulterated by
other chemicals, inhibitors, oils, solvents, etc., shall not be transported in
bulk cargo tanks except upon authorization by the Commandant (G–MSO).
(f) The requirements of § 151.50–20 are
also applicable to the shipment of
phosphoric acid.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 82–063b, 48 FR 4781, Feb. 3,
1983]

§ 151.50–30

Compressed gases.

(a) All tank inlet and outlet connections, except safety relief valves, liquid
level gauging devices, and pressure
gauges shall be marked to designate
whether they terminate in the vapor or
liquid space. Labels, when used, shall
be of corrosion-resistant materials and
may be attached to valves.
(b) Venting. (1) Except as provided in
paragraph (b)(2) of this section each
safety relief valve installed on a cargo
tank shall be connected to a branch
vent of a venting system which shall be
constructed so that the discharge of
gas will be directed vertically upward
to a point at least 10 feet above the
weatherdeck or the top of any tank or
house located above the weatherdeck.
(2) Safety valves on cargo tanks in
barges may be connected to individual
or common risers which shall extend to
a reasonable height above the deck.
Where the escape of vapors from the
venting system may interfere with
towing operations, the installation
shall be acceptable to the Commandant, and the arrangement shall be
such as to minimize the hazard of escaping vapors. Arrangements specially
provided for venting cargo tanks forming part of the hull on unmanned
barges will be given special consideration by the Commandant.
(3) The capacity of branch vents or
vent headers shall depend upon the
number of cargo tanks connected to
such branch or header as provided in
Table 151.50–30(b)(3).

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§ 151.50–30

46 CFR Ch. I (10–1–01 Edition)

TABLE 151.50–30(b)(3)—CAPACITY OF BRANCH
VENTS OR VENT HEADERS
Percent
of total
valve discharge

Number of cargo tanks

1
3
4
5
6

or 2 .....................................................................
.............................................................................
.............................................................................
.............................................................................
or more ...............................................................

100
90
80
70
60

(4) Return bends and restrictive pipe
fittings are prohibited. Vents and headers shall be so installed as to minimize
stresses on safety relief valves and
their mounting nozzles.
(5) When vent discharge risers are installed, they shall be so located as to
protect against physical damage and be
fitted with loose raincaps.
(6) When vent discharge risers are installed and their installation in accordance with the provisions of this paragraph results in restrictions in the operation of the barge due to navigation
clearances, the vents may be designed
so as to be collapsible when passing
under such low clearance obstacles.
(c) Repairs involving welding or burning. (1) Repairs involving welding or
burning shall not be undertaken on the
cargo tanks or piping while cargo in either the liquid or vapor state is present
therein.
(2) Repairs involving welding or burning on parts of the barge other than
cargo tanks or piping may be undertaken provided positive pressure is

maintained in the tanks or the tanks
have been vented or washed internally.
(d) Respiratory equipment. (1) At least
one approved self-contained breathing
apparatus shall be available in a readily accessible location off the barge at
all times during the cargo transfer operations. This equipment shall not be
considered to be part of the barge
equipment, and the barge shall not be
required to carry this equipment en
route.
(2) The approved self-contained
breathing apparatus, masks, and all
respiratory protective devices shall be
of types suitable for starting and operating at the temperatures encountered,
and shall be maintained in good operating condition.
(3) Personnel involved in the cargo
transfer operations shall be adequately
trained in the use of the respiratory
equipment.
(e) Filling densities and container design pressure. For compressed gases
transported at or near ambient temperatures, the maximum filling densities and minimum design pressure of
container as indicated in Table 151.50–
30(e) shall apply. Deviations from the
tabulated values shall be submitted to
the Commandant for approval. Where
cargo is to be carried at temperatures
below ambient, the tank shall be designed in accordance with § 151.15–
3(b)(3) and the maximum amount of
cargo shall be in accordance with
§ 151.45–6(b).

TABLE 151.50–30(e)—FILLING DENSITIES AND CONTAINER DESIGN PRESSURES
Maximum permitted
filling density (percent
by weight, see
§ 151.03–21)

Kind of gas

Uninsulated
tanks
Ammonia, anhydrous ..............................................................................................
Chlorine ...................................................................................................................
Dichlorodifluoromethane .........................................................................................
Dimethylamine .........................................................................................................
Methyl chloride ........................................................................................................
Monochlorodi-fluoromethane ...................................................................................
Vinyl chloride ...........................................................................................................

(f) The shell and head thickness of
liquefied compressed cargo tanks shall
not be less than five-sixteenths inch.

57
125
123
61
85
110
86

Insulated
tanks
58
125
125
62
87
113
87

Minimum design
pressure of tank
(pounds per square
inch gauge)
Uninsulated
tanks
250
300
147
46
131
243
81

Insulated
tanks
215
300
127
36
112
211
67

(g) The special requirements for ammonia (anhydrous) in § 151.50–32, for
argon in § 151.50–36, for chlorine in
§ 151.50–31, for nitrogen in § 151.50–36,

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§ 151.50–31

and for vinyl chloride in § 151.50–34 also
apply to the carriage of those gases.
[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40040, Sept. 29,
1989]

§ 151.50–31 Chlorine.
(a) Chlorine barges. Subparts 98.03 and
98.20 of Part 98 of this chapter have
been revoked. However, chlorine barges
that were certified in accordance with
the requirements of subpart 98.20 of
part 98 of this chapter and having hulls
modified, if necessary, to comply with
§§ 98.03–5(c) and 98.03–25(c) of this chapter, shall be considered as complying
with this part.
(b) Design and construction of cargo
tanks. (1) The cargo tanks shall meet
the requirements of Class I pressure
vessels.
(2) Tanks shall be designed for a pressure of not less than 300 pounds per
square inch gauge. For the maximum
allowable working pressure of tanks in
service, see paragraph (q) of this section.
(3) Each tank shall be provided with
one or more 24-inch inside diameter
manhole, fitted with a cover located
above the maximum liquid level and as
close as possible to the top of the tank.
There shall be no other openings in the
tank.
(c) Tanks may be installed ‘‘on deck’’
or ‘‘under deck’’ with the tank protruding above deck. If a portion of the
tank extends above the weatherdeck,
provision shall be made to maintain
the weathertightness on the deck. All
tanks shall be installed with the manhole
opening
located
above
the
weatherdeck. Hopper type barges operating on protected inland waters may
have tanks located in the hopper space.
(d) All valves, flanges, fittings and
accessary equipment shall be of a type
suitable for use with chlorine and shall
be made of metal, corrosion-resistant
to chlorine in either the gas or liquid
phase. Cast or malleable iron shall not
be used. Valves, flanges, and flanged
joints shall be 300 pounds A.N.S.I.
standard minimum with tongue and
groove or raised face. Joints shall be
fitted with sheet lead or other suitable
gasket material. Welded fittings shall
be used wherever possible and the number of pipe joints held to a minimum.

Threaded joints in cargo lines and
vapor lines shall not be used in sizes
above 1 inch internal diameter. Welded
‘‘hammerlock’’ unions or other unions
approved by the Commandant may be
used at terminal points of fixed barge
piping.
(e) Each tank shall be provided with
liquid and vapor connections fitted
with manually operated shutoff valves
and with safety relief valves. All valves
shall be bolted to the cover or covers
specified in paragraph (b)(3) of this section and shall be protected against mechanical damage by a suitable protective metal housing. A drain connection
shall be provided from the protective
housing.
(f) All liquid and vapor connections,
except safety relief valves, shall be
fitted with automatic excess flow
valves, which shall be located on the
inside of the tank. Bypass openings are
not permitted in excess flow valves.
(g) Chlorine barge cargo piping shall
not be fitted with the nonreturn valves
specified by § 151.20–20(b).
(h) Liquid level gauging devices of
any type are prohibited on chlorine
tanks.
(i) A pressure gauge shall be attached
to the vapor shutoff valve or vapor line
so as to indicate the pressure in the
tank at all times during loading and
unloading.
(j) Piping including connections between tank valves and fixed barge piping, shall be of a thickness of not less
than Schedule 80.
(k) In multiple tank installations the
tanks shall not be interconnected by
piping or manifolds which may contain
liquid chlorine. Manifolding of vapor
lines of individual tanks into a common header for connection to shore is
permitted. More than one cargo tank
may be filled or discharged at a time,
provided each tank is filled from or discharged to shore tanks through separate lines.
(l) Connections between fixed barge
piping and shore piping shall be fabricated from one of the following:
(1) Schedule 80 seamless pipe, having
flexible metallic joints.
(2) Corrosion-resistant metallic pipe
(equivalent to Schedule 80) not subject
to deterioration by chlorine, having
flexible metallic joints.

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§ 151.50–31

46 CFR Ch. I (10–1–01 Edition)

(3) Flexible metallic hose acceptable
to the Commandant. If paragraphs
(k)(1) or (2) of this section are used, the
flexible metallic joints shall meet the
requirements for cargo hose. See
§ 151.04–5(h).
(m) Safety relief valves shall discharge into the protective housing surrounding the valves. Suitable provisions shall be made to vent the housing. The arrangement shall be such as
to minimize the hazard of escaping vapors.
(n) Cargo transfer operations. (1) The
amount of chlorine loaded into each
cargo tank shall be determined by
weight. Draft marks shall not be used
as a means of weighing. Any chlorine
vapors vented during the filling operation shall be disregarded when calculating the maximum amount of chlorine to be loaded into the cargo tanks.
(2) Prior to the start of filling operations, care shall be exercised to insure
that the cargo tanks are empty, dry,
and free from foreign matter.
(3) After the filling operation is completed, the vapor in each cargo tank
shall be analyzed to determine the percentage of gaseous chlorine in the
vapor space. If it should contain less
than 80 percent chlorine by volume, vapors shall be withdrawn through the
vent or vapor line until the vapor in
the cargo tanks contains at least 80
percent chlorine by volume.
(4) After filling connections are removed, upon completion of the loading
of a cargo tank, all connections at the
tank shall be tested for leakage of
chlorine by the aqua ammonia method.
(5) The chlorine in the cargo tanks
shall be discharged by the pressure differential method. If the vapor pressure
of the chlorine is not sufficient to force
the liquid out of the tank, compressed
air, or other nonreactive gas, may be
used to secure the desired rate of discharge, provided the air or gas is oilfree and thoroughly dried by passing it
over activated aluminum oxide, silica
gel, or other acceptable drying agent,
and provided the supply pressure is
limited to 75 percent of maximum allowable pressure of chlorine tanks.
(6) After completion of cargo transfer, any liquid chlorine in the cargo
piping shall be removed and cargo
transfer piping shall be disconnected at

the cargo tanks. After disconnecting
the cargo piping, both ends of the line
shall be closed and all inlet and outlet
valves on the tank shall be plugged or
fitted with blind flanges.
(o) During cargo transfer, every person on the barge shall carry on his person a respiratory protective device
which will protect the wearer against
chlorine vapors and will provide respiratory protection for emergency escape from a contaminated area resulting from cargo leakage. This respiratory protective equipment shall be
of such size and weight that the person
wearing it will not be restricted in
movement or in the wearing of a lifesaving device.
(p) During each internal inspection,
each cargo tank must be tested
hydrostatically to 11⁄2 times the maximum allowable pressure as determined
by the safety relief valve setting.
(q) During each internal inspection,
each cargo tank excess flow valve and
safety relief valve must be inspected
and tested in accordance with paragraphs (g) and (i) of § 151.04–5 of this
chapter.
(r) When periodic inspection indicates that a cargo tank has deteriorated in service, the maximum allowable pressure shall be recalculated,
using the minimum thickness found by
actual measurement. The recalculated
maximum allowable pressure shall be
not less than 275 pounds per square
inch gauge. If the recalculated maximum allowable pressure is less than
275 pounds per square inch gauge, the
cargo tanks shall be withdrawn from
service.
(s) The following substances shall not
be carried as stores on board barges
transporting chlorine in bulk: hydrogen, methane, liquefied petroleum
gases, coal gas, acetylene, ammonia,
turpentine, compounds containing metallic powders, finely divided metals or
finely divided organic materials.
(t) The requirements of § 151.50–30 for
compressed gases are also applicable to
the shipment of chlorine.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 85–061, 54 FR 50966, Dec. 11,
1989; CGD 85–061, 55 FR 41918, Oct. 16, 1990]

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§ 151.50–34

§ 151.50–32 Ammonia, anhydrous.
(a) The anhydrous ammonia tanks
may be installed in the bulk liquid
cargo tanks provided the liquid surrounding the enclosed anhydrous ammonia tanks complies with the following chemical and physical properties:
(1) Boiling point above 125 °F atmospheric pressure.
(2) Inert to ammonia at 100 °F at atmospheric pressure.
(3) Noncorrosive in the liquid and
vapor phase to the ammonia tanks and
piping.
(b) Copper, copper alloys, and copper
bearing alloys shall not be used as materials of construction for tanks, pipelines, valves, fittings, and other items
of equipment that may come in contact
with anhydrous ammonia liquid or
vapor.
(c) Valves, flanges and pipe fittings
shall be of the tongue and groove or
raised-face type, fitted with suitable
gasket material. Welded fittings shall
be used wherever possible and the number of pipe joints shall be held to a
minimum. Threaded joints are not permitted for pipe diameters exceeding 2
inches. Brazed joints are prohibited.
(d) All enclosed spaces containing
cargo tanks fitted with bottom outlet
connections shall be provided with mechanical ventilation of sufficient capacity to assure a change of air every
3 minutes.
(e) Each cargo tank shall be electrically grounded to the hull.
(f) When transferring cargo, a hose
shall be connected to a water supply so
that if leakage of anhydrous ammonia
occurs the vapor may be dispersed by
the use of water fog. This requirement
can be met by facilities provided from
shore.
(g) During cargo transfer operations,
every person on the vessel shall carry
on his person or have close at hand at
all times a canister mask approved for
ammonia or each person shall carry on
his person a respiratory protective device which will protect the wearer
against ammonia vapors and will provide respiratory protection for emergency escape from a contaminated area
resulting from cargo leakage. This respiratory protective equipment shall be
of such size and weight that the person

wearing it will not be restricted in
movement or in the wearing of a lifesaving device.
(h) [Reserved]
(i) The requirements of § 151.50–30 for
compressed gases are also applicable to
the shipment of anhydrous ammonia.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 85–061, 54 FR 50966, Dec. 11,
1989]

§ 151.50–34 Vinyl chloride (vinyl chloride monomer).
(a) Copper, aluminum, magnesium,
mercury, silver, and their alloys shall
not be used as materials of construction for tanks, pipelines, valves, fittings, and other items of equipment
that may come in contact with vinyl
chloride liquid or vapor.
(b) Valves, flanges, and pipe fittings
shall be of the tongue and groove or
raised-face type, fitted with suitable
gasket material. Welded fittings shall
be used wherever possible and the number of pipe joints shall be held to a
minimum. Threaded joints are not permitted for pipe diameters exceeding 2
inches. Brazed joints are prohibited.
(c) Each cargo tank shall be electrically grounded to the hull.
(d) The vessel shall be electrically
bonded to the shore piping prior to connecting the cargo hose. This electrical
bonding shall be maintained until after
the cargo hose has been disconnected
and any spillage has been removed.
(e) To the extent he deems it necessary, the Officer in Charge, Marine
Inspection, may require that sufficient
insulation shall be removed from insulated tanks at least once in each 8 calendar years to permit spot external examination of the tanks and insulation
in accordance with § 151.04–5(c).
(f) The requirements of § 151.50–30 for
compressed gases are also applicable to
the shipment of vinyl chloride.
(g) The person in charge of cargo
transfer shall ensure that:
(1) Cargo vapors are returned to the
cargo tank or shore disposition for reclamation or destruction during cargo
transfer operations;
(2) Continuous monitoring for vinyl
chloride vapor leaks is conducted
aboard a tank barge undergoing vinyl
chloride transfer operations. Fixed or

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§ 151.50–36

46 CFR Ch. I (10–1–01 Edition)

portable instrumentation may be utilized to ensure that personnel are not
exposed to vinyl chloride vapor concentrations in excess of 1 ppm averaged
over any eight hour period of 5 ppm
averaged over any period not exceeding
15 minutes. The method of monitoring
and measurement shall have an accuracy (with a confidence level of 95 percent) of not less than plus or minus 50
percent from 0.25 through 0.5 ppm, plus
or minus 35 percent from over 0.5 ppm
through 1.0 ppm, and plus or minus 25
percent over 1.0 ppm;
(3) Cargo transfer operation is discontinued or corrective action is initiated
by the person in charge to minimize exposure to personnel whenever a vinyl
chloride vapor concentration in excess
of 1 ppm is detected. If the vinyl chloride vapor concentration exceeds 5 ppm
for over 15 minutes, action to reduce
the leak can be continued only if the
respiratory protection requirements of
29 CFR 1910.1017 are met by all personnel in the area of the leak;
(4) Those portions of cargo lines
which will be open to the atmosphere
after piping is disconnected are free of
vinyl chloride liquid and that the vinyl
chloride vapor concentration in the
area of the cargo piping disconnect
points is not greater than 5 ppm;
(5) Any restricted gauge fitted on a
tank containing vinyl chloride is effectively out of service by locking or sealing the device so that it cannot be
used; and
(6) A restricted gauge is not to be
used as a ‘‘check’’ on the required
closed gauge, nor as a means or sampling.
(h) The words ‘‘CANCER—SUSPECT
AGENT’’ must be added to the warning
signs required by 46 CFR 151.45–2(e).
(i) Signs bearing the legend:
CANCER—SUSPECT AGENT IN THIS AREA
PROTECTIVE EQUIPMENT REQUIRED
AUTHORIZED PERSONNEL ONLY

must be posted whenever hazardous operations, such as tank cleaning, are in
progress.
(j) A tank barge undergoing cargo
transfer operations must be designated
a ‘‘regulated area’’ having access limited to authorized persons and requir-

ing a daily roster of authorized persons
who may board the barge.
(k) Employees engaged in hazardous
operations, such as tank cleaning,
must be provided, and be required to
wear and use respiratory protection in
accordance with the provisions of 29
CFR 1910.1017 and protective garments,
provided clean and dry for each use, to
prevent skin contact with liquid vinyl
chloride.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 74–167R, 40 FR 17026, Apr.
16, 1975; CGD 88–100, 54 FR 40040, Sept. 29,
1989]

§ 151.50–36 Argon or nitrogen.
(a) A cargo tank that contains argon
or nitrogen and that has a maximum
allowable working pressure of 172 kPa
(25 psig) or greater must have one of
the following arrangements:
(1) A refrigeration system that keeps
the tank pressure below the safety relief valve operating pressure when ambient temperatures are 46 °C (115 °F) air
and 32 °C (90 °F) water.
(2) A relief valve or pressure control
valve that maintains the tank pressure
below the setting of the tank’s required
safety relief valve in ambient temperatures of 46 °C (115 °F) air and 32 °C (90
°F) water.
(b) A cargo tank with a maximum allowable working pressure of less than
172 kPa (25 psig) is approved by the
Commandant (G–MSO) on a case by
case basis.
(c) Section 151.50–30 also applies to
the carriage of argon or nitrogen.
[CGD 88–100, 54 FR 40040, Sept. 29, 1989]

§ 151.50–40 Additional
requirements
for carbon disulfide (carbon bisulfide) and ethyl ether.
(a) The provisions of this section are
applicable if specifically referenced in
the Special Requirements column of
Table 151.05.
(b) Cargo tanks shall be electrically
bonded to the hull of the vessel. A vessel shall be electrically bonded to the
shore piping prior to connecting the
cargo hose. This electrical bonding
shall be maintained until after the
cargo hose has been disconnected and
any spillage has been removed.
(c) Pumps may be used for discharging cargo: Provided, That they are

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§ 151.50–42

the vertical submerged type designed
to avoid liquid pressure against the
shaft gland and are suitable for use
with the cargo.
(d) Provisions shall be made to maintain an inert gas padding in the cargo
tank during loading, unloading and
during transit.
(e) Provisions shall be made to prevent any leakage being washed into the
waterways at the loading and unloading points.
(f) The special requirements of
§ 151.50–41 for carbon disulfide (carbon
bisulfide) and § 151.50–42 for ethyl ether
shall also be observed.
[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40029, Sept. 29,
1989]

§ 151.50–41 Carbon
bisulfide).

disulfide

(carbon

(a) All openings shall be in the top of
the tank.
(b) Loading lines shall terminate
near the bottom of the tank.
(c) A standard ullage opening shall be
provided for secondary and emergency
sounding.
(d) If a cargo discharge pump is used,
it shall be inserted through a cylindrical well extending from the tank top
to a point near the tank bottom. A
blanket of water shall be formed in this
well before attempting pump removal.
(e) Water or inert gas displacement
may be used for discharging cargo provided the cargo system is designed for
the expected pressure and temperature.
This method for discharging may be
used with pressure type tanks only.
(f) Adequate natural ventilation shall
be provided for the voids around the
cargo tanks while the vessel is under
way. During loading and unloading,
forced ventilation shall be used. The
forced ventilation shall be of sufficient
capacity to provide a complete change
of air within each void space every 5
minutes. The ventilating fan shall be of
nonsparking construction.
(g) Because of its low ignition temperature and the close clearances required to arrest its flame propagation,
carbon disulfide (carbon bisulfide) requires safeguards beyond those required for any electrical hazard groups.

(h) The requirements of § 151.50–40 are
also applicable to the shipment of carbon disulfide (carbon bisulfide).
[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40040, Sept. 29,
1989]

§ 151.50–42

Ethyl ether.

(a)(1) Gravity tanks shall be designed
and tested to meet the rules of the
American Bureau of Shipping for a
head of water at least 8 feet above the
tank top or the highest level the lading
may rise, whichever is greater. All
openings shall be in the top of the
tank.
(2) Pressure vessel type tanks shall
be designed for the maximum pressure
to which they may be subjected when
pressure is used to discharge the cargo,
but in no case shall the design pressure
be less than 50 pounds per square inch
gauge. All openings shall be in the top
of the tank.
(b) Adequate natural ventilation
shall be provided for the voids around
the cargo tanks while the vessel is underway. If a power ventilation system
is installed, all blowers shall be of nonsparking construction. Power driven
ventilation equipment shall not be located in the void spaces surrounding
the cargo tanks.
(c) Pressure relief valve settings
shall not be less than 3 pounds per
square inch gauge for gravity tanks.
For pressure vessels, the relief valve
setting shall not exceed the design
pressure of the tank.
(d) Inert gas displacement may be
used for discharging cargo from pressure vessel tanks provided the cargo
system is designed for the expected
pressure and the discharge pressure
does not exceed 50 pounds per square
inch gauge or the design pressure of
the tank, whichever is less.
(e) No electrical equipment except
for approved lighting fixtures shall be
installed in enclosed spaces adjacent to
the cargo tanks. Lighting fixtures
must be approved for use in Class I,
Group C, hazardous locations. The installation of electrical equipment on
the weather deck shall comply with the
requirements of part 111, subpart
111.105 of this chapter.

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§ 151.50–50

46 CFR Ch. I (10–1–01 Edition)

(f) Copper, silver, mercury and magnesium or other acetylide forming metals and their alloys shall not be used as
materials of construction for tanks,
pipelines, valves, fittings and other
items of equipment that may come in
contact with the cargo vapor or liquid.
(g) Precautions shall be taken to prevent the contamination of ethyl ether
by strong oxidizing agents.
(h) The requirements of § 151.50–40 are
also applicable to the shipment of
ethyl ether.
[CFGR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 88–100, 54 FR 40040, Sept. 29,
1989]

§ 151.50–50 Elemental phosphorus in
water.
(a) Tanks shall be designed and tested for a head equivalent to the design
lading of phosphorus and its water
blanket extended to 8 feet above the
tank top. In addition, tank design calculations shall demonstrate that the
tank can withstand, without rupture, a
single loading to the highest level to
which the water blanket may rise, if
that exceeds 8 feet. Tanks shall not be
less than 5⁄16-inch thick.
(b) When a water displacement method of discharge is used, pressure vessel
type cargo tanks, designed and tested
in accordance with Subchapter F of
this chapter shall be employed. Such
tanks shall be designed for the maximum pressure to which they may be
subjected when water pressure is used
to discharge the cargo.
(c) Each cargo tank shall be fitted
with an approved pressure vacuum relief valve set to discharge at a pressure
not exceeding 2 pounds per square inch.
When transferring cargo, the vent discharge shall lead overboard above the
waterline. When pressure vessel type
tanks are used, each tank shall be
fitted with a relief valve of suitable
size.
(d) Sufficient outage shall be provided to prevent the tank from being
liquid full at any time, but in no case
shall the outage be less than 1 percent.
When pressure vessel type tanks are
used, outage need not be provided.
(e) The use of compressed air to discharge cargo is prohibited.
(f) Cargo shall be loaded at a temperature not exceeding 140 °F, and then

cooled until the water above the cargo
has a temperature not exceeding 105 °F
prior to the movement of the vessel.
Upon presentation of satisfactory proof
that procedures followed will provide
adequate safety in transportation and
handling, the Commandant may authorize movement of the vessel following cooling of the water above the
cargo to a temperature exceeding 105
°F.
(g) Coils in which steam or hot water
is circulated to heat the cargo so that
it may be pumped shall be located outside the cargo tanks.
(h) A fixed ballast piping system (including a power driven pump of ample
capacity), or other means acceptable to
the Commandant shall be installed so
that any void space surrounding the
tanks may be flooded.
(i) All openings shall be in the top of
the tank and shall be fitted with bolted
cover plates and gaskets resistant to
the attack of phosphorus pentoxide.
(j) All enclosed compartments containing cargo tanks shall be provided
with effective means of ventilation.
(k) Cargo lines shall be traced with
steam piping and secured thereto by
lagging to prevent solidification of
cargo during transfer operations.
(l) During cargo transfer, a water
hose shall be connected to a water supply ready for immediate use, and any
spillage of phosphorus shall be immediately washed down. This requirement
can be met by facilities provided from
shore.
(m) At least two fresh air masks or
self-contained
breathing
apparatus
shall be stowed on board the vessel at
all times for use of personnel entering
the tanks or adjacent spaces.
(n) Authorization from the Commandant (G–MSO) shall be obtained to
transport lading other than phosphorus
in the cargo tanks or to have on board
any other cargo when phosphorus is
laden in the tanks.
(o) Mechanical ventilation of sufficient capacity to insure a change of air
within the cargo tanks every 3 minutes
shall be provided during the inspection
and maintenance of the cargo tanks.
(p) Cargo tanks shall be electrically
bonded to the hull of the barge. A vessel shall be electrically bonded to the
shore piping prior to connecting the

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§ 151.50–73

cargo hose. This electrical bonding
shall be maintained until after the
cargo hose has been disconnected.
[CGFR 70–10, 35 FR 3714, Feb. 24, 1970, as
amended by CGD 82–063b, 48 FR 4781, Feb. 3,
1983]

§ 151.50–55

Sulfur (molten).

(a) Ventilation (cargo tank):
(1) Cargo tank ventilation shall be
provided to maintain the concentration
of H2S below one-half of its lower explosive limit throughout the cargo
tank vapor space for all conditions of
carriage; i.e., below 1.85 percent by volume.
(2) Where mechanical ventilation systems are used for maintaining low gas
concentrations in cargo tanks, an
alarm system shall be provided to give
warning if the system fails.
(3) Connections shall be provided to
enable sampling of the atmosphere
over the cargo in each cargo tank for
analysis.
(4) The ventilation system shall be
designed and arranged to preclude the
depositing of sulfur within the system.
(b) Void spaces:
(1) Openings to void spaces adjacent
to cargo tanks shall be designed and
fitted to prevent the entry of water,
sulfur or cargo vapors.
(2) Connections shall be provided to
enable sampling and analyzing vapors
in void spaces.
(c) Temperature controls shall be
provided in accordance with § 151.20–10
and applicable sections of Subpart
151.40 of this part. Heat transfer media
shall be steam, and alternate media
will require specific approval of the
Commandant.
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970]

§ 151.50–60

Benzene.

The person in charge of a Coast
Guard inspected barge must ensure
that the provisions of part 197, subpart
C, of this chapter are applied.
[CGD 88–040, 56 FR 65006, Dec. 13, 1991]

§ 151.50–70 Cargoes requiring inhibition or stabilization.
When table 151.05 refers to this section, that cargo must be—
(a) Inhibited; or

(b) Stabilized.
[CGD 88–100, 54 FR 40040, Sept. 29, 1989]

§ 151.50–73
ing.

Chemical protective cloth-

When table 151.05 refers to this section, the following apply:
(a) The person in charge of cargo
handling operations shall ensure that
the following chemical protective
clothing constructed of materials resistant to permeation by the cargo
being handled is worn by all personnel
engaged in an operation listed in paragraph (b) of this section:
(1) Splash protective eyewear.
(2) Long-sleeved gloves.
(3) Boots or shoe covers.
(4) Coveralls or lab aprons.
NOTE: ‘‘Guidelines for the Selection of
Chemical Protective Clothing’’, Third Edition, 1987, available from the American Conference of Governmental Industrial Hygienists, 1330 Kemper Meadow Drive, Cincinnati,
OH 45240–1634, provides information on the
proper clothing for the cargo being handled.

(b) The section applies during the following operations:
(1) Sampling cargo.
(2) Transferring cargo.
(3) Making or breaking cargo hose
connections.
(4) Gauging a cargo tank, unless
gauging is by closed system.
(5) Opening cargo tanks.
(c) Coveralls or lab aprons may be replaced by splash suits or aprons constructed of light weight or disposable
materials if, in the judgment of the
person in charge of cargo handling operations,
(1) Contact with the cargo is likely to
occur only infrequently and accidentally; and
(2) The splash suit or apron is disposed of immediately after contamination.
(d) Splash protective eyewear must
be tight-fitting chemical-splash goggles, face shields, or similar items intended specifically for eye protection
from chemical splashing or spraying.
(e) The person in charge of cargo handling operations shall ensure that each
person in the vicinity of an operation
listed in the paragraph (b) of this section or in the vicinity of tanks, piping,
or pumps being used to transfer the

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§ 151.50–74

46 CFR Ch. I (10–1–01 Edition)

cargo wears splash protective eyewear
under paragraph (d) of this section.
[CGD 88–100, 54 FR 40040, Sept. 29, 1989, as
amended by USCG–1999–6216, 64 FR 53227, Oct.
1, 1999]

§ 151.50–74 Ethylidene norbornene.
When Table 151.05 refers to this section, the following apply:
(a) 151.50–5 (g) and (h)
(b) Rubber hoses or fittings may not
be used in transfer operations.
[CGD 80–001, 46 FR 63279, Dec. 31, 1981]

§ 151.50–75 Ferric chloride solution.
A containment system (cargo tank
piping system, venting system, and
gauging system) carrying this solution
must be lined with rubber, corrosion
resistant plastic, or a material approved by the Commandant (G–MSO).
[CGD 80–001, 46 FR 63279, Dec. 31, 1981, as
amended by CGD 82–063b, 48 FR 4781, Feb. 3,
1983; CGD 88–100, 54 FR 40041, Sept. 29, 1989; 55
FR 17276, Apr. 24, 1990]

§ 151.50–76 Hydrochloric acid, spent
(NTE 15%).
(a)(1) Gravity type cargo tanks must
be designed and tested to meet the
rules of the American Bureau of Shipping for a head of water at least 8 feet
above the tank top or the highest level
the lading may rise, whichever is
greater. The plate thickness of any
part of the tank may not be less than
three-eighths inch. A shell plating of a
barge may not be on the boundary of
any part of the cargo tank.
(2) Gravity tank vents must:
(i) Terminate above the weatherdeck,
clear of all obstructions and away from
any from any source of ignition; and
(ii) Be fitted with a single flame
screen or two fitted flame screens as
described in § 151.03–25. Neither a shutoff valve nor a frangible disk may be
fitted in the vent lines.
(b) Openings in the tanks are prohibited below deck, except for access openings used for inspection and maintenance of tanks, or unless otherwise
specifically approved by the Commandant (G–MSO). Openings must be
fitted with bolted cover plates and
acid-resistant gaskets.
(c) Where special arrangements are
approved by the Commandant (G–MSO)

to permit a pump suction to be led
from the bottom of the tank, the filling
and discharge lines must be fitted with
shutoff valves located above the
weatherdeck or operable from it.
(d) The outage may not be less than
1 percent.
(e) An enclosed compartment containing, or a compartment adjacent to,
a cargo tank:
(1) May have no electrical equipment
that does not meet or exceed class I–B
electrical requirements; and
(2) Must have at least one gooseneck
vent of 2.5 inch diameter or greater.
The structural arrangement of the
compartment must provide for the free
passage of air and gases to the vent or
vents.
(f) No lights may be used during the
cargo transfer operations, except installed electric or portable battery
lights. Smoking is prohibited and the
person in charge of cargo transfer shall
ensure that ‘‘No Smoking’’ signs are
displayed during cargo transfer operations.
(g) Tanks approved for the transportation of acid cargoes subject to this
section may not be used for the transportation of any other commodity, except upon authorization by the Commandant (G–MSO).
(h) Each cargo tank must be examined internally at least once in every 4
years. If the lining of the cargo tank
has deteriorated in service or is not in
place, the Marine Inspector may require the tank to be tested by such
nondestructive means as he may consider necessary to determine its condition.
[CGD 80–001, 46 FR 63279, Dec. 31, 1981, as
amended by CGD 82–063b, 48 FR 4781, Feb. 3,
1983]

§ 151.50–77 Fluorosilicic acid (30% or
less) (hydrofluorosilicic acid).
(a) Hydrofluorosilicic acid must be
carried in gravity or pressure type
cargo tanks independent of the vessel’s
structure. The tanks must be lined
with rubber or other equally suitable
material approved by the Commandant
(G–MSO). See § 151.15–3(f)(2).
(b) Notwithstanding the provisions of
§ 151.50–20(b)(3), no compressed air may
be used to discharge hydrofluorosilicic

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§ 151.50–80

acid from gravity type cargo tanks unless:
(1) The tanks are of cylindrical shape
with dished heads, and
(2) The air pressure does not exceed:
(i) The design pressure of the tank,
and
(ii) 10 pounds per square inch gauge.
The tanks must be fitted with pressure
relief devices.
(c) During cargo tansfer, a water hose
must be connected to a water supply
and be ready for immediate use. Any
leakage or spillage of acid must be immediately washed down. This requirement can be met by facilities provided
from shore.
[CGD 80–001, 46 FR 63279, Dec. 31, 1981, as
amended by CGD 82–063b, 48 FR 4781, Feb. 3,
1983; CGD 92–100, 59 FR 17028, Apr. 11, 1994]

§ 151.50–79 Methyl
acetylene-propadiene mixture.
(a) The composition of the methyl
acetylene-propadiene mixture at loading must be within one of the following
sets of composition limits:
(1) Composition 1 is:
(i) Maximum methyl acetylene to
propadiene molar ratio of 3 to 1;
(ii) Maximum combined concentration of methyl acetylene and propadiene of 65 mole percent;
(iii) Minimum combined concentration of propane, butane, and isobutane
of 24 mole percent, of which at least
one-third (on a molar basis) must be
butanes and one-third propane; and
(iv) Maximum combined concentration of propylene and butadiene of 10
mole percent.
(2) Composition 2 is:
(i) Maximum methyl acetylene and
propadiene combined concentration of
30 mole percent;
(ii) Maximum methyl acetylene concentration of 20 mole percent;
(iii) Maximum propadiene concentration of 20 mole percent;
(iv) Maximum propylene concentration of 45 mole percent;
(v)
Maximum
butadiene
and
butylenes combined concentration of 2
mole percent;
(vi) Minimum saturated C4 hydrocarbon concentration of 4 mole percent; and
(vii) Minimum propane concentration
of 25 mole percent.

(b) A barge carrying a methyl
acetylene-propadiene mixture must
have a refrigeration system that does
not compress the cargo vapor or have a
refrigeration system with the following
features:
(1) A vapor compressor that does not
raise the temperature and pressure of
the vapor above 60 °C (140 °F) and 1.72
MPa guage (250 psig) during its operations, and that does not allow vapor
to stagnate in the compressor while it
continues to run.
(2) At the discharge piping from each
compressor stage or each cylinder in
the same stage of a reciprocating compressor:
(i) Two temperature actuated shutdown switches set to operate at 60 °C
(140 °F) or less;
(ii) A pressure actuated shutdown
switch set to operate at 1.72 MPa gauge
(250 psig) or less; and
(iii) A safety relief valve set to relieve at 1.77 MPa gauge (256 psig) or
less anywhere except into the compressor suction line.
(c) The piping system, including the
cargo refrigeration system, for tanks
to be loaded with methyl acetylenepropadiene mixture must be completely separate from piping and refrigeration systems for other tanks. If the
piping system for the tanks to be loaded with methyl acetylene-propadiene
mixture is not independent, the required piping separation must be accomplished by the removal of spool
pieces, valves or other pipe sections
and the installation of blank flanges at
these locations. The required separation applies to all liquid and vapor piping, liquid and vapor vent lines and any
other possible connections, such as
common inert gas supply lines.
[CGD 80–001, 46 FR 63279, Dec. 31, 1981]

§ 151.50–80

Nitric acid (70% or less).

(a) Tanks, cargo piping, valves, fittings, and flanges (where exposed to
the acid) must be lined with nitric acid
resistant rubber or fabricated from nitric acid resistant stainless steel. See
§ 151.15–3(f)(2).
(b) During cargo transfer, a water
hose must be connected to a water supply, ready for immediate use. Any

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§ 151.50–81

46 CFR Ch. I (10–1–01 Edition)

leakage or spillage of acid must be immediately washed down. This requirement can be met by facilities provided
from shore.
(c) Nitric acid contaminated by other
chemicals, oils, solvents, etc. may not
be transported in bulk without an authorization from the Commandant (G–
MSO).
[CGD 80–001, 46 FR 63280, Dec. 31, 1981, as
amended by CGD 82–063b, 48 FR 4781, Feb. 3,
1983; CGD 88–100, 54 FR 40041, Sept. 29, 1989]

§ 151.50–81 Special operating requirements for heat sensitive cargoes.
When table 151.05 refers to this section, the following apply to the cargo:
(a) Must not be carried in a tank
equipped with heating coils unless the
heating supply to the coils is disconnected.
(b) Must not be carried in a tank adjacent to another tank containing an
elevated temperature cargo.
(c) Must not be carried in a deck
tank.
[CGD 80–001, 46 FR 63280, Dec. 31, 1981, as
amended by CGD 88–100, 54 FR 40041, Sept. 29,
1989]

§ 151.50–84

Sulfur dioxide.

(a) Sulfur dioxide that is transported
under the provisions of this part may
not contain more than 100 ppm of
water.
(b) Cargo piping must be at least
Schedule 40 pipe.
(c) Flanges must be 150 lb. A.N.S.I.
Standard minimum with tongue and
groove or raised face.
(d) A cargo tank must:
(1) Meet the requirements of a Class
I welded pressure vessel;
(2) Be designed for a maximum allowable working pressure of at least 125
psig;
(3) Be hydrostatically tested every
two years to at least 188 psig;
(4) Be provided with one or more
manholes that are fitted with a cover
sized not less than 15 inches by 23
inches or 13 inches nominal diameter,
located above the maximum liquid
level, and as close as possible to the
top of the tank;
(5) Have no openings other than those
required in paragraph (d)(4) of this section;

(6) Have no liquid level gauges other
than closed or indirect gauges;
(7) Have all valves and the closed
gauge that is required by Table 151.05
bolted to the cover or covers that are
required in paragraph (d)(4) of this section;
(8) Have a metal housing that is
fitted with a drain and vent connection
protecting all valves and the closed
gauge within this housing against mechanical damage;
(9) Have all safety relief valves discharging into the protective housing;
(10) Not be interconnected with another cargo tank by piping or manifold
that carriers cargo liquid, except vapor
lines connected to a common header,
and
(11) Have an excess flow valve that is
located on the inside of the tank for
every liquid and vapor connection, except the safety relief valve;
(12) Have no bypass opening on any
excess flow valve.
(e) Cargo transfer operations:
(1) May not be conducted with more
than one cargo tank at a time unles
each tank is filled from or discharged
to shore tanks through separate lines;
(2) Must be conducted with connections between fixed barge piping and
shore piping of either Schedule 40 pipe
having flexible metallic joints that
meet § 151.04–5(h) or of flexible metallic
hose that is acceptable to the Commandant (G–MSO);
(3) From barge to shore must be by
pressurization with an oil free, non-reactive gas that has a maximum of 100
ppm moisture;
(4) Must be conducted with vapor return to shore connections that ensure
that all vapor is returned to shore; and
(5) Must be conducted with every person on the barge carrying a respiratory
protective device that protects the
wearer against sulfur dioxide vapors
and provides respiratory protection for
emergency escape from a contaminated
area that results from cargo leakage.
(f) Respiratory protective equipment
must be of a size and weight that allows unrestricted movement and wearing of a lifesaving device.
(g) After the completion of cargo
transfer, all liquid sulfur dioxide in the
cargo piping must be removed and

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Coast Guard, DOT

§ 151.56–1

cargo transfer piping must be disconnected at the cargo tanks. After the
cargo piping is disconnected, both ends
of the line must be plugged or fitted
with blind flanges.
[CGD 80–001, 46 FR 63280, Dec. 31, 1981, as
amended by CGD 82–063b, 48 FR 4781, Feb. 3,
1983; CGD 88–100, 54 FR 40041, Sept. 29, 1989; 55
FR 17276, Apr. 24, 1990]

§ 151.50–86 Alkyl (C7–C9) nitrates.
(a) The carriage temperature of octyl
nitrates must be maintained below 100
°C (212 °F) in order to prevent the occurrence
of
a
self-sustaining
exothermic decomposition reaction.
(b) Octyl nitrates may not be carried
in a deck tank unless the tank has a
combination of insulation and a water
deluge system sufficient to maintain
the tank’s cargo temperature below 100
°C (212 °F) and the cargo temperature
rise at or below 1.5 °C(2.7 °F)/hour, for
a fire of 650 °C (1200 °F).
[CGD 88–100, 54 FR 40040, Sept. 29, 1989; CGD
92–100, 59 FR 17028, Apr. 11, 1994]

Subpart 151.55—Special Requirements for Materials of Construction
§ 151.55–1 General.
(a) This section provides special requirements for the materials of construction of equipment that may come
into contact with various cargoes.
Table 151.05 contains specific requirements for various cargoes.
(b) Copper, copper alloys, zinc, and
aluminum shall not be used as materials of construction for tanks, pipelines, valves, fittings, and other items
of equipment that may come in contact
with the cargo liquid or vapor. (Equivalent to § 151.56–1(a),(b), and (c).)
(c) Copper, copper alloys, zinc, galvanized steel, and mercury shall not be
used as materials of construction for
tanks, pipelines, valves, fittings, and
other items of equipment that may
come in contact with the cargo liquid
or vapor. (Equivalent to § 151.56–1(b),(c),
and (g).)
(d) Aluminum, magnesium, zinc, and
lithium shall not be used as materials
of construction for tanks, pipelines,
valves, fittings, and other items of
equipment that may come in contact

with the cargo liquid or vapor. (Equivalent to § 151.56–1(a),(c), and (d).)
(e) Copper and copper bearing alloys
shall not be used as materials of construction for tanks, pipelines, valves,
fittings, and other items of equipment
that may come in contact with the
cargo liquid or vapor. (Equivalent to
§ 151.56–1(b).)
(f) Aluminum or copper or alloys of
either shall not be used as materials of
construction for tanks, pipelines,
valves, fittings, and other items of
equipment that may come in contact
with the cargo vapor or liquid. (Equivalent to § 151.56–1(a) and (b).)
(g) Aluminum, stainless steel, or
steel covered with a suitable protective
lining or coating shall be used as materials of construction for tanks, pipelines, valves fittings, and other items
of equipment that may come in contact
with the cargo liquid or vapor. (Equivalent to § 151.58–1(a).)
(h) Alkaline or acidic materials, such
as caustic soda or sulfuric acid, should
not be allowed to contaminate this
cargo.
(i) For concentrations of 98 percent
or greater, aluminum or stainless steel
shall be used as materials of construction. For concentrations of less than 98
percent, 304L or 316 stainless steel shall
be used as materials of construction.
(j) Zinc, alloys that have more than
10 percent zinc by weight, and aluminum may not be used as materials of
construction for tanks, pipelines,
valves, fittings, and other items of
equipment that may come in contact
with cargo liquid or vapor. (Equivalent
to § 151.56–1(a) and (c).)
[CGFR 70–10, 35 FR 3714, Feb. 25, 1970, as
amended by CGD 73–275R, 41 FR 3087, Jan. 21,
1976; CGD 75–223, 42 FR 8378, Feb. 10, 1977;
CGD 88–100, 54 FR 40041, Sept. 29, 1989]

Subpart 151.56—Prohibited
Materials of Construction
§ 151.56–1 Prohibited materials.
When one of the following paragraphs
of this section is referenced in table
151.05, the materials listed in that
paragraph may not be used in components that contact the cargo or its
vapor:
(a) Aluminum or aluminum alloys.
(b) Copper or copper alloys.

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§ 151.58–1

46 CFR Ch. I (10–1–01 Edition)

(c) Zinc, galvanized steel, or alloys
having more than 10 percent zinc by
weight.
(d) Magnesium.
(e) Lead.
(f) Silver or silver alloys.
(g) Mercury.
[CGD 88–100, 54 FR 40041, Sept. 29, 1989]

Subpart 151.58—Required
Materials of Construction
§ 151.58–1

Required materials.

When one of the following paragraphs
of this section is referenced in table
151.05, only those materials listed in
that paragraph may be used in components that contact the cargo or its
vapor:
(a) Aluminum, stainless steel, or
steel covered with a protective lining
or coating. (See § 151.15–3(f)(2).)
(b)–(c) [Reserved]
(d) Solid austenitic stainless steel.
(e) Stainless steel or steel covered
with a suitable protective lining or
coating. (See § 151.15–3(f)(2).)
[CGD 88–100, 54 FR 40041, Sept. 29, 1989]

PART 152 [RESERVED]
PART 153—SHIPS CARRYING BULK
LIQUID, LIQUEFIED GAS, OR
COMPRESSED GAS HAZARDOUS
MATERIALS
Subpart A—General
Sec.
153.0 Availability of materials.
153.1 Applicability.
153.2 Definitions and acronyms.
153.3 Right of appeal.
153.4 Incorporation by reference.
153.7 Ships built before December 27, 1977
and non-self-propelled ships built before
July 1, 1983: Application.
153.8 Procedures for requesting an endorsed
Certificate of Inspection.
153.9 Foreign flag vessel endorsement application.
153.10 Procedures for requesting alternatives and waivers; termination of
waivers.
153.12 IMO Certificates for United States
Ships.
153.15 Conditions under which the Coast
Guard issues a Certificate of Inspection
or Certificate of Compliance.

153.16 Requirements for foreign flag vessel
permits.
153.30 Special area endorsement.
153.40 Determination of materials that are
hazardous.

Subpart B—Design and Equipment
GENERAL VESSEL REQUIREMENTS
153.190 Stability requirements.
153.201 Openings to accommodation, service
or control spaces.
153.208 Ballast equipment.
153.209 Bilge pumping systems.
153.214 Personnel emergency and safety
equipment.
153.215 Safety equipment lockers.
153.216 Shower and eyewash fountains.
153.217 Access to enclosed spaces and dedicated ballast tanks.
153.219 Access to double bottom tanks serving as dedicated ballast tanks.
CARGO CONTAINMENT SYSTEMS
153.230 Type I system.
153.231 Type II system.
153.232 Type III system.
153.233 Separation of tanks from machinery,
service and other spaces.
153.234 Fore and aft location.
153.235 Exceptions to cargo piping location
restrictions.
153.236 Prohibited materials.
153.238 Required materials.
153.239 Use of cast iron.
153.240 Insulation.
CARGO TANKS
153.250 Double-bottom and deep tanks as
cargo tanks.
153.251 Independent cargo tanks.
153.252 Special requirement for an independent cargo tank.
153.254 Cargo tank access.
153.256 Trunks, domes, and openings of
cargo tanks.
153.266 Tank linings.
PIPING SYSTEMS AND CARGO HANDLING
EQUIPMENT
153.280 Piping system design.
153.281 Piping to independent tanks.
153.282 Cargo filling lines.
153.283 Valving for cargo piping.
153.284 Characteristics of required quick
closing valves.
153.285 Valving for cargo pump manifolds.
153.292 Separation of piping systems.
153.294 Marking of piping systems.
153.296 Emergency shutdown stations.
153.297 Emergency actuators at the point of
cargo control.
CARGO HANDLING SPACE VENTILATION
153.310
153.312

Ventilation system type.
Ventilation system standards.

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File Type	application/pdf
File Modified	2014-12-08
File Created	2014-12-08