U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 49Chapter IPart 179Subpart F - Subpart F—Specification for Cryogenic Liquid Tank Car Tanks and Seamless Steel Tanks (Classes DOT-113 and 107A)
View all text of Subpart F [§ 179.400 - § 179.500-18]
§ 179.400-21 - Test of pressure relief valves.

Each valve must be tested with air or gas for compliance with § 179.401-1 before being put into service.

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