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Title 49

Displaying title 49, up to date as of 8/13/2026. Title 49 was last amended 8/07/2026.
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Title 49TransportationPart / Section
Subtitle BOther Regulations Relating to Transportation100 – 1699
Chapter IPipeline and Hazardous Materials Safety Administration, Department of Transportation100 – 199
Subchapter CHazardous Materials Regulations171 – 185
Part 179Specifications for Tank Cars179.1 – 179.500-18
Subpart CSpecifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)179.100 – 179.103-5
§ 179.100General specifications applicable to pressure tank car tanks.
§ 179.100-1Tanks built under these specifications shall comply with the requirements of §§ 179.100, 179.101 and when applicable, §§ 179.102 and 179.103.
§ 179.100-3Type.
§ 179.100-4Insulation.
§ 179.100-6Thickness of plates.
§ 179.100-7Materials.
§ 179.100-8Tank heads.
§ 179.100-9Welding.
§ 179.100-10Postweld heat treatment.
§ 179.100-12Manway nozzle, cover and protective housing.
§ 179.100-13Venting, loading and unloading valves, measuring and sampling devices.
§ 179.100-14Bottom outlets.
§ 179.100-16Attachments.
§ 179.100-17Closures for openings.
§ 179.100-18Tests of tanks.
§ 179.100-19Tests of safety relief valves.
§ 179.100-20Stamping.
§ 179.101Individual specification requirements applicable to pressure tank car tanks.
§ 179.101-1Individual specification requirements.
§ 179.102Special commodity requirements for pressure tank car tanks.
§ 179.102-1Carbon dioxide, refrigerated liquid.
§ 179.102-2Chlorine.
§ 179.102-3Materials poisonous by inhalation.
§ 179.102-4Vinyl fluoride, stabilized.
§ 179.102-17Hydrogen chloride, refrigerated liquid.
§ 179.103Special requirements for class 114A * * * tank car tanks.
§ 179.103-1Type.
§ 179.103-2Manway cover.
§ 179.103-3Venting, loading and unloading valves, measuring and sampling devices.
§ 179.103-4Safety relief devices and pressure regulators.
§ 179.103-5Bottom outlets.