49 C.F.R. § 179.220-24 Tests of pressure relief valves.
Title 49 - Transportation
Each safety relief valve must be tested by air or gas for compliance with §179.15 before being put into service. [Amdt. 179–9, 36 FR 21343, Nov. 6, 1971, as amended at 62 FR 51561, Oct. 1, 1997]
Title 49: Transportation
PART 179—SPECIFICATIONS FOR TANK CARS
Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW and 115AW)
§ 179.220-24 Tests of pressure relief valves.