Federal regulations · Through 2026-08-25 · Newer source version available

49 CFR 179.401-1: -1 Individual specification requirements.

In addition to § 179.400, the individual specification requirements for the inner tank and its appurtenances are as follows:
DOT specification 113A60W 113C120W
Design service temperature, °F −423 −260.
Material § 179.400-5 § 179.400-5.
Impact test (weld and plate material) § 179.400-5(c) § 179.400-5(c).
Impact test values § 179.400-5(d) § 179.400-5(d).
Standard heat transfer rate.
(Btu per day per lb. of water capacity, max.) (see § 179.400-4) 0.097 0.4121.
Bursting pressure, min. psig 240 300.
Minimum plate thickness shell, inches (see § 179.400-7(a)) 3⁄16 3⁄16.
Minimum head thickness, inches (see § 179.400-8 (a), (b), and (c)) 3⁄16 3⁄16.
Test pressure, psig (see § 179.400-16) 60 120.
Safety vent bursting pressure, max. psig 60 120.
Pressure relief valve start-to-discharge pressure, psig (±3 psi) 30 75.
Pressure relief valve vapor tight pressure, min. psig 24 60.
Pressure relief valve flow rating pressure, max. psig 40 85.
Alternate pressure relief valve start to-discharge pressure, psig (±3 psi) 90.
Alternate pressure relief valve vapor tight pressure, min. psig 72.
Alternate pressure relief valve flow rating pressure, max. psig 100.
Pressure control valve Start-to-vent, max. psig (see § 179.400-20(c)(4)) 17 Not required.
Relief device discharge restrictions § 179.400-20 179.400-20.
Transfer line insulation § 179.400-17 Not required.

Where this section sits in the code

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)

In addition to § 179.400, the individual specification requirements for the inner tank and its appurtenances are as follows:

DOT specification 113A60W 113C120W

Design service temperature, °F −423 −260.

Material § 179.400-5 § 179.400-5.

Impact test (weld and plate material) § 179.400-5(c) § 179.400-5(c).

Impact test values § 179.400-5(d) § 179.400-5(d).

Standard heat transfer rate.

(Btu per day per lb. of water capacity, max.) (see § 179.400-4) 0.097 0.4121.

Bursting pressure, min. psig 240 300.

Minimum plate thickness shell, inches (see § 179.400-7(a)) 3⁄16 3⁄16.

Minimum head thickness, inches (see § 179.400-8 (a), (b), and (c)) 3⁄16 3⁄16.

Test pressure, psig (see § 179.400-16) 60 120.

Safety vent bursting pressure, max. psig 60 120.

Pressure relief valve start-to-discharge pressure, psig (±3 psi) 30 75.

Pressure relief valve vapor tight pressure, min. psig 24 60.

Pressure relief valve flow rating pressure, max. psig 40 85.

Alternate pressure relief valve start to-discharge pressure, psig (±3 psi) 90.

Alternate pressure relief valve vapor tight pressure, min. psig 72.

Alternate pressure relief valve flow rating pressure, max. psig 100.

Pressure control valve Start-to-vent, max. psig (see § 179.400-20(c)(4)) 17 Not required.

Relief device discharge restrictions § 179.400-20 179.400-20.

Transfer line insulation § 179.400-17 Not required.

Collected 2026-08-27T02:26:34Z. Source file · JSON

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