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Title 46

Displaying title 46, up to date as of 7/09/2026. Title 46 was last amended 6/30/2026.
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  1. Title 46 —Shipping
  2. Chapter I —Coast Guard, Department of Homeland Security
  3. Subchapter O —Certain Bulk Dangerous Cargoes
  4. Part 153 —Ships Carrying Bulk Liquid, Liquefied Gas, or Compressed Gas Hazardous Materials
  5. Subpart B   View Full Text
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eCFR Content

The Code of Federal Regulations (CFR) is the official legal print publication containing the codification of the general and permanent rules published in the Federal Register by the departments and agencies of the Federal Government. The Electronic Code of Federal Regulations (eCFR) is a continuously updated online version of the CFR. It is not an official legal edition of the CFR.

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Title 46ShippingPart / Section
Chapter ICoast Guard, Department of Homeland Security1 – 199
Subchapter OCertain Bulk Dangerous Cargoes150 – 155
Part 153Ships Carrying Bulk Liquid, Liquefied Gas, or Compressed Gas Hazardous Materials153.0 – 153.1608
Subpart BDesign and Equipment153.190 – 153.812
General Vessel Requirements153.190 – 153.219
§ 153.190Stability requirements.
§ 153.201Openings to accommodation, service or control spaces.
§ 153.208Ballast equipment.
§ 153.209Bilge pumping systems.
§ 153.214Personnel emergency and safety equipment.
§ 153.215Safety equipment lockers.
§ 153.216Shower and eyewash fountains.
§ 153.217Access to enclosed spaces and dedicated ballast tanks.
§ 153.219Access to double bottom tanks serving as dedicated ballast tanks.
Cargo Containment Systems153.230 – 153.240
§ 153.230Type I system.
§ 153.231Type II system.
§ 153.232Type III system.
§ 153.233Separation of tanks from machinery, service and other spaces.
§ 153.234Fore and aft location.
§ 153.235Exceptions to cargo piping location restrictions.
§ 153.236Prohibited materials.
§ 153.238Required materials.
§ 153.239Use of cast iron.
§ 153.240Insulation.
Cargo Tanks153.250 – 153.266
§ 153.250Double-bottom and deep tanks as cargo tanks.
§ 153.251Independent cargo tanks.
§ 153.252Special requirement for an independent cargo tank.
§ 153.254Cargo tank access.
§ 153.256Trunks, domes, and openings of cargo tanks.
§ 153.266Tank linings.
Piping Systems and Cargo Handling Equipment153.280 – 153.297
§ 153.280Piping system design.
§ 153.281Piping to independent tanks.
§ 153.282Cargo filling lines.
§ 153.283Valving for cargo piping.
§ 153.284Characteristics of required quick closing valves.
§ 153.285Valving for cargo pump manifolds.
§ 153.292Separation of piping systems.
§ 153.294Marking of piping systems.
§ 153.296Emergency shutdown stations.
§ 153.297Emergency actuators at the point of cargo control.
Cargo Handling Space Ventilation153.310 – 153.316
§ 153.310Ventilation system type.
§ 153.312Ventilation system standards.
§ 153.314Ventilation of spaces not usually occupied.
§ 153.316Special cargo pumproom ventilation rate.
Cargo Pumprooms153.330 – 153.336
§ 153.330Access.
§ 153.332Hoisting arrangement.
§ 153.333Cargo pump discharge pressure gauge.
§ 153.334Bilge pumping systems.
§ 153.336Special cargo pump or pumproom requirements.
Cargo Venting Systems153.350 – 153.372
§ 153.350Location of B/3 vent discharges.
§ 153.351Location of 4m vent discharges.
§ 153.352B/3 and 4 m venting system outlets.
§ 153.353High velocity vents.
§ 153.354Venting system inlet.
§ 153.355PV venting systems.
§ 153.358Venting system flow capacity.
§ 153.360Venting system restriction.
§ 153.361Arrangements for removal of valves from venting systems having multiple relief valves.
§ 153.362Venting system drain.
§ 153.364Venting system supports.
§ 153.365Liquid overpressurization protection.
§ 153.368Pressure-vacuum valves.
§ 153.370Minimum relief valve setting for ambient temperature cargo tanks.
§ 153.371Minimum relief valve setting for refrigerated cargo tanks.
§ 153.372Gauges and vapor return for cargo vapor pressures exceeding 100 kPa (approx. 14.7 psia).
Cargo Gauging Systems153.400 – 153.409
§ 153.400General requirements for gauges.
§ 153.404Standards for containment systems having required closed gauges.
§ 153.406Standards for containment systems having required restricted gauges.
§ 153.407Special requirements for sounding tube gauges.
§ 153.408Tank overflow control.
§ 153.409High level alarms.
Cargo Temperature Control Systems153.430 – 153.440
§ 153.430Heat transfer systems; general.
§ 153.432Cooling systems.
§ 153.434Heat transfer coils within a tank.
§ 153.436Heat transfer fluids: compatibility with cargo.
§ 153.438Cargo pressure or temperature alarms required.
§ 153.440Cargo temperature sensors.
Special Requirements for Flammable or Combustible Cargoes153.460 – 153.466
§ 153.460Fire protection systems.
§ 153.461Electrical bonding of independent tanks.
§ 153.462Static discharges from inert gas systems.
§ 153.463Vent system discharges.
§ 153.465Flammable vapor detector.
§ 153.466Electrical equipment.
Design and Equipment for Pollution Control153.470 – 153.491
§ 153.470System for discharge of NLS residue to the sea: Categories A, B, C, and D.
§ 153.480Stripping quantity for Category B and C NLS tanks on ships built after June 30, 1986: Categories B and C.
§ 153.481Stripping quantities and interim standards for Category B NLS tanks on ships built before July 1, 1986: Category B.
§ 153.482Stripping quantities and interim standards for Category C NLS tanks on ships built before July 1, 1986: Category C.
§ 153.483Restricted voyage waiver for Category B and C NLS tanks on ships built before July 1, 1986: Category B and C.
§ 153.484Prewash equipment.
§ 153.486Design and equipment for removing NLS residue by ventilation: Categories A, B, C, and D.
§ 153.488Design and equipment for tanks carrying high melting point NLSs: Category B.
§ 153.490Cargo Record Book and Approved Procedures and Arrangements Manual: Categories A, B, C, and D.
§ 153.491Waiver of certain equipment for dedicated cargo tanks.
Special Requirements153.500 – 153.602
§ 153.500Inert gas systems.
§ 153.501Requirement for dry inert gas.
§ 153.515Special requirements for extremely flammable cargoes.
§ 153.520Special requirements for carbon disulfide.
§ 153.525Special requirements for unusually toxic cargoes.
§ 153.526Toxic vapor detectors.
§ 153.527Toxic vapor protection.
§ 153.530Special requirements for alkylene oxides.
§ 153.545Special requirements for liquid sulfur.
§ 153.554Special requirements for acids.
§ 153.555Special requirements for inorganic acids.
§ 153.556Special requirements for sulfuric acid and oleum.
§ 153.557Special requirements for hydrochloric acid.
§ 153.558Special requirements for phosphoric acid.
§ 153.559Special requirements for nitric acid (less than 70 percent).
§ 153.560Special requirements for Alkyl (C7-C9) nitrates.
§ 153.565Special requirement for temperature sensors.
§ 153.602Special requirements for cargoes reactive with water.
Testing and Inspection153.806 – 153.812
§ 153.806Loading information.
§ 153.808Examination required for a Certificate of Compliance.
§ 153.809Procedures for having the Coast Guard examine a vessel for a Certificate of Compliance.
§ 153.812Inspection for Certificate of Inspection.
eCFR Content