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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 psig). | 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 psig). | 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]