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e-CFR data is current as of September 25, 2020

Title 46Chapter ISubchapter OPart 153

TITLE 46—Shipping






Availability of materials.
Definitions and acronyms.
Right of appeal.
Incorporation by reference.
Ships built before December 27, 1977 and non-self-propelled ships built before July 1, 1983: Application.
Procedures for requesting an endorsed Certificate of Inspection.
Foreign flag vessel endorsement application.
Procedures for requesting alternatives and waivers; termination of waivers.
IMO Certificates for United States Ships.
Conditions under which the Coast Guard issues a Certificate of Inspection or Certificate of Compliance.
Requirements for foreign flag vessel permits.
Special area endorsement.
Determination of materials that are hazardous.


General Vessel Requirements

Stability requirements.
Openings to accommodation, service or control spaces.
Ballast equipment.
Bilge pumping systems.
Personnel emergency and safety equipment.
Safety equipment lockers.
Shower and eyewash fountains.
Access to enclosed spaces and dedicated ballast tanks.
Access to double bottom tanks serving as dedicated ballast tanks.

Cargo Containment Systems

Type I system.
Type II system.
Type III system.
Separation of tanks from machinery, service and other spaces.
Fore and aft location.
Exceptions to cargo piping location restrictions.
Prohibited materials.
Required materials.
Use of cast iron.

Cargo Tanks

Double-bottom and deep tanks as cargo tanks.
Independent cargo tanks.
Special requirement for an independent cargo tank.
Cargo tank access.
Trunks, domes, and openings of cargo tanks.
Tank linings.

Piping Systems and Cargo Handling Equipment

Piping system design.
Piping to independent tanks.
Cargo filling lines.
Valving for cargo piping.
Characteristics of required quick closing valves.
Valving for cargo pump manifolds.
Separation of piping systems.
Marking of piping systems.
Emergency shutdown stations.
Emergency actuators at the point of cargo control.

Cargo Handling Space Ventilation

Ventilation system type.
Ventilation system standards.
Ventilation of spaces not usually occupied.
Special cargo pumproom ventilation rate.

Cargo Pumprooms

Hoisting arrangement.
Cargo pump discharge pressure gauge.
Bilge pumping systems.
Special cargo pump or pumproom requirements.

Cargo Venting Systems

Location of B/3 vent discharges.
Location of 4m vent discharges.
B/3 and 4 m venting system outlets.
High velocity vents.
Venting system inlet.
PV venting systems.
Venting system flow capacity.
Venting system restriction.
Arrangements for removal of valves from venting systems having multiple relief valves.
Venting system drain.
Venting system supports.
Liquid overpressurization protection.
Pressure-vacuum valves.
Minimum relief valve setting for ambient temperature cargo tanks.
Minimum relief valve setting for refrigerated cargo tanks.
Gauges and vapor return for cargo vapor pressures exceeding 100 kPa (approx. 14.7 psia).

Cargo Gauging Systems

General requirements for gauges.
Standards for containment systems having required closed gauges.
Standards for containment systems having required restricted gauges.
Special requirements for sounding tube gauges.
Tank overflow control.
High level alarms.

Cargo Temperature Control Systems

Heat transfer systems; general.
Cooling systems.
Heat transfer coils within a tank.
Heat transfer fluids: compatibility with cargo.
Cargo pressure or temperature alarms required.
Cargo temperature sensors.

Special Requirements for Flammable or Combustible Cargoes

Fire protection systems.
Electrical bonding of independent tanks.
Static discharges from inert gas systems.
Vent system discharges.
Flammable vapor detector.
Electrical equipment.

Design and Equipment for Pollution Control

System for discharge of NLS residue to the sea: Categories A, B, C, and D.
Stripping quantity for Category B and C NLS tanks on ships built after June 30, 1986: Categories B and C.
Stripping quantities and interim standards for Category B NLS tanks on ships built before July 1, 1986: Category B.
Stripping quantities and interim standards for Category C NLS tanks on ships built before July 1, 1986: Category C.
Restricted voyage waiver for Category B and C NLS tanks on ships built before July 1, 1986: Category B and C.
Prewash equipment.
Design and equipment for removing NLS residue by ventilation: Categories A, B, C, and D.
Design and equipment for tanks carrying high melting point NLSs: Category B.
Cargo Record Book and Approved Procedures and Arrangements Manual: Categories A, B, C, and D.
Waiver of certain equipment for dedicated cargo tanks.

Special Requirements

Inert gas systems.
Requirement for dry inert gas.
Special requirements for extremely flammable cargoes.
Special requirements for carbon disulfide.
Special requirements for unusually toxic cargoes.
Toxic vapor detectors.
Toxic vapor protection.
Special requirements for alkylene oxides.
Special requirements for liquid sulfur.
Special requirements for acids.
Special requirements for inorganic acids.
Special requirements for sulfuric acid and oleum.
Special requirements for hydrochloric acid.
Special requirements for phosphoric acid.
Special requirements for nitric acid (less than 70 percent).
Special requirements for Alkyl (C7-C9) nitrates.
Special requirement for temperature sensors.
Special requirements for cargoes reactive with water.

Testing and Inspection

Loading information.
Examination required for a Certificate of Compliance.
Procedures for having the Coast Guard examine a vessel for a Certificate of Compliance.
Inspection for Certificate of Inspection.


Documents and Cargo Information

Certificates and authorization to carry a bulk liquid hazardous material.
Documents: Posting, availability, and alteration.
Expiration and invalidation of the Certificate of Compliance.
Operating a United States ship in special areas: Categories A, B, and C.
Limitations in the endorsement.
Regulations required to be on board.
Cargo information.
Cargo viscosity and melting point information; measuring cargo temperature during discharge: Categories A, B, and C.
Completing the Cargo Record Book and record retention: Categories A, B, C, and D.
Cargo piping plan.
Certificate of inhibition or stabilization.

General Cargo Operational Requirements

Cargo quantity limitations.
Inerting systems.

General Vessel Safety

Cargo antidotes.
Obstruction of pumproom ladderways.
Goggles and protective clothing.
Chemical protective clothing.
Entry into spaces containing cargo vapor.
Opening of tanks and cargo sampling.
Storage of cargo samples.
Illness, alcohol, drugs.

Marking of Cargo Transfer Hose

Standards for marking of cargo hose.

Cargo Transfer Procedures

Signals during cargo transfer.
Warning signs during cargo transfer.
Persons in charge of transferring liquid cargo in bulk or cleaning cargo tanks.
Approval to begin transfer operations required.
Discharge by gas pressurization.
Discharge by liquid displacement.
Cargo transfer conference.
Cargo transfer piping.
Connecting a cargo hose.
Preparation for cargo transfer.
Transfer of packaged cargo or ship's stores.
Supervision of cargo transfer.
Gauging with a sounding tube.
Isolation of automatic closing valves.
Leaving room in tank for cargo expansion.
Termination procedures.

Special Cargo Procedures

Special operating requirements for cargoes reactive with water.
Special operating requirements for heat sensitive cargoes.
Prohibited carriage in deck tanks.
Inhibited and stabilized cargoes.
Alkylene oxides.
Changing containment systems and hoses to and from alkylene oxide service.
Unusually toxic cargoes.
Motor fuel antiknock compounds.
Acetone cyanohydrin or lactonitrile solutions.
Carbon disulfide.
Inorganic acids.
Sulfuric acid.
Carriage of other cargoes in acid tanks.
Sodium chlorate solutions.

Approval of Surveyors and Handling of Categories A, B, C, and D Cargo and NLS Residue

Responsibility of the person in charge.
Procedures for getting a Surveyor: Approval of Surveyors.
Handling and disposal of NLS residue: Categories A, B, C, and D.
Draining of cargo hose: Categories A, B, C, and D.
Cleaning agents.
Heated prewash for solidifying NLS, high viscosity NLS and required prewashes of NLS whose viscosity exceeds 25 mPa sec at 20 °C: Categories A, B, and C.
Prewash for tanks containing Category A NLS residue.
Conditions under which a prewash may be omitted: Categories A, B, and C.
Prewash for tanks unloaded without following the approved Procedures and Arrangements Manual: Categories B and C.
Prewash of Categories B and C cargo tanks not meeting stripping standards: Categories B and C.
When to prewash and discharge NLS residues from a prewash; unloading an NLS cargo in a country whose Administration is not signatory to MARPOL 73/78: Categories A, B, and C.
Procedures for tank prewash: Categories A, B, and C.
Discharges of NLS residue from tank washing other than a prewash: Categories A, B, and C.
Discharges of Category D NLS residue.
Discharge of NLS residue from a slop tank to the sea: Categories A, B, C, and D.
Discharge of NLS residue from a cargo tank to the sea: Categories A. B, C, and D.
Failure of slops discharge recording equipment; operating with, reporting failures, and replacing pollution equipment: Category A, B, C, D.
Reporting spills and non-complying discharges: Category A, B, C, and D.


Venting system rupture disks.
Fixed ballast relocation.
Inspection of personnel emergency and safety equipment.


Equipment required for conducting the stripping quantity test.
Test procedure for determining the stripping quantity.
Determining the stripping quantity from the test results.
Calculation of total NLS residue and clingage NLS residue.
Table 1 to Part 153—Summary of Minimum Requirements
Table 2 to Part 153—Cargoes Not Regulated Under Subchapters D or O of This Chapter When Carried in Bulk on Non-Oceangoing Barges
Appendix I to Part 153 [Reserved]
Appendix II to Part 153—Metric Units Used in Part 153

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