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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 179.400-10

-10 Sump or siphon bowl.

Current as of 2026-08-18 Government source

eCFR editorial compilationAuthoritative but unofficial

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A sump or siphon bowl may be in the bottom of the inner tank shell if—#

(a)It is formed directly into the inner tank shell, or is formed and welded to the inner tank shell and is of weldable quality metal that is compatible with the inner tank shell;#

(b)The stress in any orientation under any condition does not exceed the circumferential stress in the inner tank shell; and#

(c)The wall thickness is not less than that specified in § 179.401-1.#