§179.401-1 — 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. |
[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]