1625-0052 Stat/Authority

§ 38.25–1

46 CFR Ch. I (10–1–02 Edition)

(3) The space surrounding tanks
whose manhole openings are below the
weather deck in accordance with
§ 38.05–10(f).
(d) Power ventilation shall be provided for each auxiliary machinery or
working space located on and accessible from the cargo handling deck.
Such ventilation systems shall be designed to preclude the entry of cargo
vapors into the space via the open access or the ventilation system itself.
[CGFR 66–33, 31 FR 15269, Dec. 6, 1966, as
amended by CGFR 68–65, 33 FR 19985, Dec. 28,
1968]

Subpart 38.25—Periodic Tests and
Inspections
§ 38.25–1 Tests and inspections—TB/
ALL.
(a) Each tank shall be subjected to
the tests and inspections described in
this section in the presence of a marine
inspector, except as otherwise provided
in this part.
(1) An internal inspection of the tank
is conducted within—
(i) Ten years after the last internal
inspection if the tank is a pressure vessel type cargo tank 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 of a type other
than that described in paragraph
(a)(1)(i) of this section.
(2) An external examination of
unlagged tanks and the visible parts of
lagged tanks shall be made at each inspection for certification and at such
other times as considered necessary.
(3) The owner shall ensure that the
amount of insulation deemed necessary
by the marine inspector is removed
from insulated tanks during each internal inspection to allow spot external
examination of the tanks and insulation, or the thickness of the tanks may
be gauged by a nondestructive means
accepted by the marine inspector without the removal of insulation.
(4) If required by the Officer in
Charge, Marine Inspection, the owner
shall conduct nondestructive testing of
each tank in accordance with § 38.25–3.
(5) If the tank is a pressure vessel
type cargo tank with an internal inspection interval of 10 years, is 30 years

old or older, determined from the date
it was built, the owner shall conduct
nondestructive testing of that tank, in
accordance with § 38.25–3, during each
internal inspection.
(b) If the marine inspector considers
a hydrostatic test necessary to determine the condition of the tank, the
owner shall perform the test at a pressure of 11⁄2 times the tanks’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.
NOTE: See the ASME Code, Section VIII,
Appendix 3 for information on design pressure.

(c) For pressure vessels designed and/
or supported such that they cannot
safely be filled with water, the Commandant will consider a pneumatic
test in lieu of the hydrostatic test. A
leak test shall be performed in conjunction with the pneumatic test.
Pneumatic testing shall be in accordance with subchapter F (Marine Engineering) of this chapter.
(d) Nonpressure vessel type tanks
shall be tested to a pressure equal to
the pressure on the bottom of the tank
under the design conditions listed in
§ 38.05–4(e).
(e) In the application of the requirements for testing of the cargo tanks,
the test shall in no case be less severe
than the worst anticipated service condition of the cargo loading.
(f) In the design and testing of the
independent cargo tanks, consideration
shall be given to the possibility of the
independent tanks being subjected to
external loads.
[CGFR 66–33, 31 FR 15269, Dec. 6, 1966, as
amended by CGD 85–061, 54 FR 50962, Dec. 11,
1989]

§ 38.25–3 Nondestructive testing—TB/
ALL.
(a) Before nondestructive testing
may be conducted to meet § 38.25–1
(a)(4) and (a)(5), the owner shall submit
a proposal to the Officer in Charge, Marine Inspection for acceptance that includes—

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Coast Guard, DOT

§ 39.10–1

(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 results to the Officer in Charge, Marine
Inspection.

PART 39—VAPOR CONTROL
SYSTEMS
Subpart 39.10—GeneraI
Sec.
39.10–1 Applicability—TB/ALL.
39.10–3 Definitions—TB/ALL.
39.10–5 Incorporation
by
reference—TB/
ALL.
39.10–9 Vessel vapor processing unit—TB/
ALL.
39.10–11 Personnel training—TB/ALL.
39.10–13 Submission of vapor control system
designs—TB/ALL.

Subpart 39.20—Design and Equipment
39.20–1 Vapor collection system—TB/ALL.
39.20–3 Cargo gauging system—TB/ALL.
39.20–7 Tankship liquid overfill protection—
T/ALL.
39.20–9 Tank barge liquid overfill protection—B/ALL.
39.20–11 Vapor overpressure and vacuum
protection—TB/ALL.
39.20–13 High and low vapor pressure protection for tankships—T/ALL.

Subpart 39.30—Operations
39.30–1

Operational requirements—TB/ALL.

Subpart 39.40—Lightering and Topping-Off
Operations with Vapor Balancing

[CGD 85–061, 54 FR 50963, Dec. 11, 1989]

§ 38.25–5 Removal of defective tanks—
TB/ALL.
If a tank fails to pass the tests prescribed in this subpart, it shall be removed from service unless otherwise
authorized by the Commandant.
§ 38.25–10
ALL.

Safety

relief

valves—TB/

(a) The cargo tank safety relief
valves shall be inspected at least once
in every 2 years.
(b) The safety relief valve discs must
be lifted from their seats in the presence of a marine inspector by either
liquid, gas, or vapor pressure at least
once every 5 years to determine the accuracy of adjustment and, if necessary,
must be reset.
[CGFR 66–33, 31 FR 15269, Dec. 6, 1966, as
amended by CGD 95–027, 61 FR 26000, May 23,
1996]

39.40–1 General requirements for vapor balancing—TB/ALL.
39.40–3 Design and equipment for vapor balancing—TB/ALL.
39.40–5 Operational requirements for vapor
balancing—TB/ALL.
AUTHORITY: 33 U.S.C. 1231; 46 U.S.C. 3306,
3703, 3715(b); 45 FR 58801, 3 CFR, 1980 Comp.,
p. 277; 49 CFR 1.46.
SOURCE: CGD 88–102, 55 FR 25446, June 21,
1990, unless otherwise noted.

Subpart 39.10—General
§ 39.10–1 Applicability—TB/ALL.
(a) Except as specified by paragraph
(c) of this section, this part applies to
each tank vessel operating in the navigable waters of the United States,
when collecting vapors of crude oil,
gasoline blends, or benzene emitted
from a vessel’s cargo tanks through a
vapor control system.
(b) A tank vessel which transfers vapors of flammable or combustible cargoes other than crude oil, gasoline
blends, or benzene, to a facility covered

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