Add to project

Projects

No projects yet

Export Official source

All sections

Browse regulation

Subpart A—Introduction, Approvals and Reports8

Subpart B—General Design Requirements11

Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)31

Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)69

Subpart E—Specifications for Multi-Unit Tank Car Tanks (Classes DOT-106A and 110AW)20

Subpart F—Specification for Cryogenic Liquid Tank Car Tanks and Seamless Steel Tanks (Classes DOT-113 and 107A)44

Regulationcurrent

49 CFR 179.221-1

-1 Individual specification requirements.

Current as of 2026-08-18 Government source

eCFR editorial compilationAuthoritative but unofficial

View source

In addition to § 179.220, the individual specification requirements are as follows:#

DOT specification Insulation Burstingpressure(psig) Minimumplatethickness (inches) Test pressure (psig) Bottomoutlet Bottomwashout Reference(179.221-***) 115A60ALW Yes 240 3⁄16 60 Optional. Optional 115A60W1 Yes 240 1⁄8 60 Optional Optional 1 115A60W6 Yes 240 1⁄8 60 Optional Optional 1#