(a) The regulations in this part contain requirements for the transportation in bulk of materials considered to be Grade E liquids when shipped in molten form at elevated temperatures.

(b) The materials covered by this part shall meet the applicable regulations of this subchapter, except that materials having a flash point of 300° F. or above, shall be exempt from the requirements prescribed in the following sections of this subchapter:

(1) Inspection prior to making repairs §35.01–1(b).

(2) Watchman for a tank vessel§35.05-15.

(3) Warning sign at gangway-§ 35.301(b).

(4) Cargo tank hatches, ullage holes and Butterworth plates-§35.30-10.

(5) Men on duty-§ 35.35–1.

(6) Inspection prior to transfer of cargo $35.35-20.

(7) Approval to start transfer of cargo $35.35-25.

(8) "Declaration of inspection" for tank ships-§ 35.35-30.

(9) Transportation of other cargo or stores on tank barges—§ 35.35-60.

(c) The regulations governing the transportation in the solid state of materials referred to in §36.01-1(a) are contained in part 148 of subchapter N (Dangerous Cargoes) of this chapter.

[CGFR 65-50, 30 FR 16716, Dec. 30, 1965, as amended by CGD 97-057, 62 FR 51043, Sept. 30, 1997]

§36.01-5 Certificate of inspection-TB/ ALL

(a) The certificate of inspection shall be endorsed for the carriage of elevated temperature cargoes as follows: "Inspected and approved for the carriage of Grade E combustible liquids when transported in molten form at elevated temperatures."

(b) [Reserved]

Subpart 36.05-Cargo Tanks §36.05-1 Installation of cargo tanks— TB/ALL.

(a) All cargo tanks carrying liquids at elevated temperatures for the pur

pose of maintaining the material in the molten form shall be installed with the access openings located above the weather deck.

(b) [Reserved]

§ 36.05-10 Protection of personnelTB/ALL.

(a) Decks, bulkheads, or other structures shall be insulated with an approved incombustible material, or other suitable means of protection shall be employed where practicable and necessary for the protection of personnel.

(b) [Reserved]

Subpart 36.10-Piping, Valves, Fittings, and Accessory Equipment

§36.10-1 Cargo pump relief valvesTB/ALL.

(a) Cargo pump relief valves and pressure gages may be omitted, however, a suitable device shall be fitted to stop the pumping before the designed pressure of the piping is exceeded. (b) [Reserved]

Subpart 36.20-Vents and
Ventilation

§ 36.20-1 Flame screens-TB/ALL.
(a) Flame screens may be omitted in
the vent lines on cargo tanks.
(b) [Reserved]

§ 36.20-5 Ventilation of pumproomTB/ALL.

(a) Where personnel are required to enter pumprooms located below the weather deck under normal circumstances of handling cargo, such pumprooms shall be equipped with power ventilation. (b) [Reserved]

Subpart 36.30-Periodic
Inspections

§ 36.30-1 Lagged tanks-TB/ALL.

(a) Lagged tanks shall have part of the lagging removed on the lower portion of the cargo tanks as directed by the marine inspector, at least once every eight years for external examination.

(b) [Reserved]

38.01-1 Scope of regulations-TB/ALL. 38.01-2 Transportation of portable cylinders or portable tanks containing or having previously contained liquefied flammable gases in dry cargo spaces-TB/ALL. 38.01-3 Incorporation by reference. 38.01-5 Certificate of inspection-TB/ALL.

Subpart 38.05-Design and Installation

38.05-1 Design and construction of vesselsgeneral-TB/ALL.

38.05-2 Design and construction of cargo tanks general-TB/ALL.

38.05-3 Design and construction of pressure vessel type cargo tanks-TB/ALL. 38.05-4 Design and construction of non-pressure vessel type cargo tanks-TB/ALL. 38.05-5 Markings-TB/ALL.

38.05-10 Installation of cargo tanks-gen

eral-TB/ALL.

38.05-20 Insulation-TB/ALL.

38.05-25 Refrigerated systems-TB/ALL.

Subpart 38.10-Piping, Valves, Fittings, and Accessory Equipment

38.10-1 Valves, fittings, and accessoriesTB/ALL.

38.10-5 Filling and discharge pipes-TB/ ALL.

38.10-10 Cargo piping-TB/ALL.

38.10-15 Safety relief valves-TB/ALL. 38.10-20 Liquid level gaging devices-TB/ ALL.

Subpart 38.15-Special Requirements 38.15-1 Filling of tanks-TB/ALL. 38.15-5 Cargo hose-TB/ALL. 38.15-10 Leak detection systems-T/ALL. 38.15-15 Electrical installations-TB/ALL. 38.15-20 Remote shutdowns-TB/ALL.

Subpart 38.20-Venting and Ventilation

38.20-1 Venting-T/ALL. 38.20-5 Venting-T/ALL. 38.20-10 Ventilation-T/ALL.

Subpart 38.25-Periodic Tests and
Inspections

38.25-1 Tests and inspections-TB/ALL. 38.25-3 Nondestructive testing-TB/ALL. 38.25-5 Removal of defective tanks-TB/ ALL.

38.25-10 Safety relief valves-TB/ALL.

AUTHORITY: 46 U.S.C. 2103, 3306, 3703; 49 U.S.C. 5101, 5106; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; 49 CFR 1.46.

(a) The regulations in this part contain requirements for the transportation of liquefied or compressed gases, whose primary hazard is one of flammability.

(b) The transportation on deck of liquefied flammable gases in portable cylinders and tanks and the transportation of empty cylinders and portable tanks previously used shall be in accordance with the requirements of 49 CFR parts 171-179. The transportation of such containers under deck shall be in accordance with the requirements of § 38.01-2.

[CGFR 66-33, 31 FR 15269, Dec. 6, 1966, as amended by CGD 86-033, 53 FR 36024, Sept. 16, 1988]

§ 38.01-2 Transportation of portable cylinders or portable tanks containing or having previously contained liquefied flammable gases in dry cargo spaces-TB/ALL.

(a) DOT cylinders, DOT Specification portable tanks or other approved portable tanks containing liquefied flammable gases may be transported under deck, provided the following require

ments are met:

(1) The cargo space shall be provided with efficient means of ventilation, be protected from artificial heat, and be readily accessible from hatches.

(2) Containers shall be stored in such a position that the safety relief device is in communication with the vapor space of the container. They shall be properly stowed, dunnaged, and secured to prevent movement in any direction.

(3) Unless a method acceptable to the Commandant is used, the containers shall not be overstowed in the same dry cargo space with other liquefied flammable gas containers, nor with other cargo.

(4) The containers shall be suitably protected against physical damage from other cargo, ship's stores, or equipment in such spaces.

(5) Cylinders shall have their valves protected at all times by one of the following methods:

(i) By metal caps securely attached to the cylinders and of sufficient strength to protect the valves from injury.

(ii) By having the valves recessed into the cylinders or otherwise protected so that they will not be subject to a blow if the cylinder is dropped on a flat surface.

(6) Portable tanks shall have their valves protected at all times by a housing in accordance with the requirements under which they were manufactured.

(7) Electrical circuits in the cargo spaces must meet the hazardous area requirements in subchapter J (Electrical Engineering Regulations) of this chapter. If an electrical circuit does not meet those requirements, it must be deenergized by a positive means and not reenergized until the cargo has been removed and the space has been tested and found free of flammable vapor.

(8) During the stowage of portable cylinders or portable tanks in a hold or compartment that is not fitted with electrical fixtures meeting the hazardous area requirements of subchapter J (Electrical Engineering Regulations) of this chapter, portable lights must not be used within the space unless the portable lights are explosion-proof. Electrical connections for portable lights must be made from outlets on the weather deck. Hand flashlights used in the stowage area must be explosion-proof.

(9) The following dangerous cargoes shall not be stowed in the same hold or compartment with liquefied flammable gas containers:

(i) Division 1.1, 1.2, 1.3, or 1.4 (explosive) materials, as defined in 49 CFR 173.50.

(ii) Flammable solids.
(iii) Oxidizing materials.
(iv) Corrosive liquids.
(v) Poisonous articles.

(vi) Cotton and similar fibrous materials.

[CGFR 66-33, 31 FR 15269, Dec. 6, 1966, as amended by CGFR 68-32, 33 FR 5714, Apr. 12, 1968; CGD 74-125A, 47 FR 15231, Apr. 8, 1982; CGD 92-050, 59 FR 39666, Aug. 5, 1994]

$38.01-3 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 38.05-Design and Installation

§ 38.05-1 Design and construction of vessels-general-TB/ALL.

(a) Vessels designed for the carriage of liquefied gases shall comply with the applicable requirements of this subchapter.

(b) Access and ventilation intakes to the machinery, accommodation and working spaces should be so arranged as to prevent the flow of cargo vapor from the weather deck into such spaces. In this respect openings in the forward or after ends of poops, forecastles, and deckhouses adjacent the cargo area shall be at least 24 inches above the cargo handling deck.

(c) Materials used in the fabrication of cargo tanks and piping shall have adequate notch toughness at the service temperature. Where a secondary barrier is required, the material of that barrier and of contiguous hull structure shall have sufficient notch toughness at the lowest temperature which may result during the containment of leakage cargo within the secondary barrier. Materials used in the fabrication of the cargo containment and handling system shall satisfy the requirements for toughness specified in subchapter F (Marine Engineering) of this chapter.

(d) Cargo tank spaces are to be isolated from the remainder of the vessel by cofferdams in accordance with §32.60-10 of this subchapter. In a nonpressure vessel configuration, the void between the primary and secondary barriers shall not be acceptable as the required cofferdam between the tank spaces and the main machinery spaces.

(e) Compartments containing cargo tanks or pipes shall be accessible from the weather deck only. No openings from these compartments to other parts of the vessel are permitted.

(f) Barges utilized for the carriage of liquefied gases shall be of Type II barge hull as defined in §32.63–5(b)(2) of this subchapter. The Commandant may, based on the properties of the liquefied gas to be carried, require a Type I barge hull, as defined in §32.63–5(b)(1) of this subchapter, to ensure the hull is consistent with the degree and nature

of the hazard of the liquefied gas to be carried.

[CGFR 66-33, 31 FR 15269, Dec. 6, 1966, as amended by CGFR 68-82, 33 FR 18806, Dec. 18, 1968; CGFR 68-65, 33 FR 19985, Dec. 28, 1968; CGFR 70-10, 35 FR 3709, Feb. 25, 1970]

§ 38.05-2 Design and construction of cargo tanks-general-TB/ALL.

(a) 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.

(b) The service temperature is the minimum temperature at which cargo is loaded and/or transported in the cargo tank. However, the service temperature shall in no case be taken higher than given by the following formula: ts-tw-0.25(tw-tь)

where:

t=Service temperature.

(1)

tw-Boiling temperature of gas at normal working pressure of tank but not higher than +32° F.

tb-Boiling temperature of gas at atmospheric pressure.

(c) Heat transmission studies, where t 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.

(d) Cargo tanks in vessels in ocean; Great Lakes; lakes, bays, and sounds; or coastwise service shall be designed to withstand, simultaneously, the following dynamic loadings:

(1) Rolling 30° each side (120°) in 10 seconds.

(2) Pitching 6o half amplitude (24°) in 7 seconds.

(3) Heaving L/80′ half amplitude (L/20') in 8 seconds.

(e) Cargo tanks on barges shall be designed in accordance with §32.63-25 of this subchapter.

(f) Each liquefied flammable gas tank shall be provided with not less than a 15-inch by 23-inch or an 18-inch nominal diameter manhole fitted with a cover located above the maximum liquid level and as close to the top of the tank as possible. Where access trunks are fitted to the tanks, the nominal diameter of the trunks shall be not less than 30 inches.

(g) Cargo tanks vented above 10 pounds per square inch gage shall be of the pressure vessel type.

$38.05-3 Design and construction of pressure vessel type cargo tanksTB/ALL.

(a) Cargo tanks of pressure vessel configuration (e.g. cylindrical, spherical, etc.) shall be designed, fabricated, inspected, and tested in accordance with the applicable requirements of part 54 of subchapter F (Marine Engineering) of this chapter, except as otherwise provided for in this part.

(b) The requirements of this section anticipate that cargo tanks constructed as pressure vessels will, by themselves, constitute the cargo containment system and usually will not require a secondary barrier.

(c) In the design of the tank, consideration shall be given to the possibility of the tank being subjected to external loads. Consideration shall also be given to excessive loads that can be imposed on the tanks by their support due to static and dynamic forces under operating conditions or during testing. The design shall show the manner in which the tanks are to be installed, supported, and secured, and shall be approved prior to tank installation.

(d) Tanks with a service temperature of minus 20° F. or lower and fabricated of ferritic materials shall be stress relieved.

(e) Unlagged cargo tanks, where the cargo is transported, at or near ambient temperatures, shall be designed for the vapor pressure of the gas 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. Whenever surrounding cargo is at a greater temperature than the maximum allowable temperature of the liquefied flammable gas tanks, the liquefied flammable gas cargo is to be such that the design pressure of the liquefied flammable gas tank is not exceeded.

(f) Where cargo tanks, in which the cargo is transported at or near ambient temperature, are lagged 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 de

gree Fahrenheit differential in temperature per hour, the tanks shall be designed for a pressure of not less than the vapor pressure of the gas at 105° F. The insulation material shall conform to the requirements of $38.05-20. 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.

(g) 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 either in service or during testing. For mechanically stress 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 satisfy the requirements of subchapter F (Marine Engineering) of this chapter for the service temperature, and this temperature shall be permanently marked on the tank as prescribed in §38.05-5.

(h) Where applicable, the design shall investigate the thermal stresses induced in the cargo tank at the service temperature.

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

[CGFR 66-33, 31 FR 15269, Dec. 6, 1966, as amended by CGFR 68-82, 33 FR 18806, Dec. 18, 1968]

§ 38.05-4 Design and construction of nonpressure vessel type cargo tanks-TB/ALL.

(a) The requirements in this section anticipate a cargo containment system consisting of a primary tank which is structurally self-supporting and, where required, a secondary barrier. Other, vessel or cargo tank configurations, such as membrane type liners externally supported, will be considered upon submission of substantiating data, and based upon such additional tests as the Commandant may direct.