Code of Federal Regulations > Title 49 > Chapter I > Part 179 > Subpart D - Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

§ 179.200 - General specifications applicable to non-pressure tank car tanks (Class DOT-111, DOT-117).

§ 179.200-1 - Tank built under these specifications must meet the applicable requirements in this part.

§ 179.200-3 - Type.

§ 179.200-4 - Insulation.

§ 179.200-6 - Thickness of plates.

§ 179.200-7 - Materials.

§ 179.200-8 - Tank heads.

§ 179.200-9 - Compartment tanks.

§ 179.200-10 - Welding.

§ 179.200-11 - Postweld heat treatment.

§ 179.200-13 - Manway ring or flange, pressure relief device flange, bottom outlet nozzle flange, bottom washout nozzle flange and other attachments and openings.

§ 179.200-14 - Expansion capacity.

§ 179.200-15 - Closures for manways.

§ 179.200-16 - Gauging devices, top loading and unloading devices, venting and air inlet devices.

§ 179.200-17 - Bottom outlets.

§ 179.200-19 - Reinforcements, when used, and appurtenances not otherwise specified.

§ 179.200-21 - Closures for openings.

§ 179.200-22 - Test of tanks.

§ 179.200-23 - Tests of pressure relief valves.

§ 179.200-24 - Stamping.

§ 179.201 - Individual specification requirements applicable to non-pressure tank car tanks.

§ 179.201-1 - Individual specification requirements.

§ 179.201-2 - [Reserved]

§ 179.201-3 - Lined tanks.

§ 179.201-4 - Material.

§ 179.201-5 - Postweld heat treatment and corrosion resistance.

§ 179.201-6 - Manways and manway closures.

§ 179.201-8 - Sampling device and thermometer well.

§ 179.201-9 - Gauging device.

§ 179.201-10 - Water capacity marking.

§ 179.201-11 - Insulation.

§ 179.202 - Individual specification requirements applicable to DOT-117 tank car tanks.

§ 179.202-1 - Applicability.

§ 179.202-2 - [Reserved]

§ 179.202-3 - Approval to operate at 286,000 gross rail load (GRL).

§ 179.202-4 - Thickness of plates.

§ 179.202-5 - Tank head puncture resistance system.

§ 179.202-6 - Thermal protection system.

§ 179.202-7 - Jackets.

§ 179.202-8 - Bottom outlets.

§ 179.202-9 - Top fittings protection.

§ 179.202-11 - Individual specification requirements.

§ 179.202-12 - Performance standard requirements (DOT-117P).

§ 179.202-13 - Retrofit standard requirements (DOT-117R).

§§ 179.203—179.202-22 - §[Reserved]

§ 179.220 - General specifications applicable to nonpressure tank car tanks consisting of an inner container supported within an outer shell (class DOT-115).

§ 179.220-1 - Tanks built under these specifications must meet the requirements of §and 179.221.

§ 179.220-3 - Type.

§ 179.220-4 - Insulation.

§ 179.220-6 - Thickness of plates.

§ 179.220-7 - Materials.

§ 179.220-8 - Tank heads.

§ 179.220-9 - Compartment tanks.

§ 179.220-10 - Welding.

§ 179.220-11 - Postweld heat treatment.

§ 179.220-13 - Inner container manway nozzle and cover.

§ 179.220-14 - Openings in the tanks.

§ 179.220-15 - Support system for inner container.

§ 179.220-16 - Expansion capacity.

§ 179.220-17 - Gauging devices, top loading and unloading devices, venting and air inlet devices.

§ 179.220-18 - Bottom outlets.

§ 179.220-20 - Reinforcements, when used, and appurtenances not otherwise specified.

§ 179.220-22 - Closure for openings.

§ 179.220-23 - Test of tanks.

§ 179.220-24 - Tests of pressure relief valves.

§ 179.220-25 - Stamping.

§ 179.220-26 - Stenciling.

§ 179.221 - Individual specification requirements applicable to tank car tanks consisting of an inner container supported within an outer shell.

§ 179.221-1 - Individual specification requirements.