{"data":{"id":"us/49-cfr-179.401-1","jurisdiction":"us","citation":"49 CFR 179.401-1","heading":"-1 Individual specification requirements.","body":"In addition to § 179.400, the individual specification requirements for the inner tank and its appurtenances are as follows:\nDOT specification 113A60W 113C120W\nDesign service temperature, °F −423 −260.\nMaterial § 179.400-5 § 179.400-5.\nImpact test (weld and plate material) § 179.400-5(c) § 179.400-5(c).\nImpact test values § 179.400-5(d) § 179.400-5(d).\nStandard heat transfer rate.\n(Btu per day per lb. of water capacity, max.) (see § 179.400-4) 0.097 0.4121.\nBursting pressure, min. psig 240 300.\nMinimum plate thickness shell, inches (see § 179.400-7(a)) 3⁄16 3⁄16.\nMinimum head thickness, inches (see § 179.400-8 (a), (b), and (c)) 3⁄16 3⁄16.\nTest pressure, psig (see § 179.400-16) 60 120.\nSafety vent bursting pressure, max. psig 60 120.\nPressure relief valve start-to-discharge pressure, psig (±3 psi) 30 75.\nPressure relief valve vapor tight pressure, min. psig 24 60.\nPressure relief valve flow rating pressure, max. psig 40 85.\nAlternate pressure relief valve start to-discharge pressure, psig (±3 psi) 90.\nAlternate pressure relief valve vapor tight pressure, min. psig 72.\nAlternate pressure relief valve flow rating pressure, max. psig 100.\nPressure control valve Start-to-vent, max. psig (see § 179.400-20(c)(4)) 17 Not required.\nRelief device discharge restrictions § 179.400-20 179.400-20.\nTransfer line insulation § 179.400-17 Not required.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 179—SPECIFICATIONS FOR TANK CARS","Subpart F—Specification for Cryogenic Liquid Tank Car Tanks and Seamless Steel Tanks (Classes DOT-113 and 107A)"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"4adca5e95ee4030c2db85445565a174f4468346f48712c2c0c67675c26ef9cd8","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-179.401","next":"us/49-cfr-179.500"},"notice":"GroundRules: Original legal text. Not legal advice."}