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

Open Table
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)) 316 316 .
Minimum head thickness, inches (see §179.400-8 (a), (b), and (c)) 316 316 .
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.

[Amdt. 179-32, 48 FR 27708, June 16, 1983, as amended at 49 FR 24318, June 12, 1984; 65 FR 58632, Sept. 29, 2000; 66 FR 45390, Aug. 28, 2001]


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