49 CFR § 179.401-1 - Individual specification requirements.

---
identifier: "/us/cfr/t49/s179.401-1"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 179.401-1 - Individual specification requirements."
title_number: 49
title_name: "Transportation"
section_number: "179.401-1"
section_name: "Individual specification requirements."
chapter_name: "PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "HAZARDOUS MATERIALS REGULATIONS"
part_number: "179"
part_name: "SPECIFICATIONS FOR TANK CARS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 5101-5128; 49 CFR 1.81 and 1.97."
regulatory_source: "29 FR 18995, Dec. 29, 1964, unless otherwise noted. Redesignated at 32 FR 5606, Apr. 5, 1967."
cfr_part: "179"
---


# 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)) | ⁄ | ⁄. |
| Minimum head thickness, inches (see § 179.400-8 (a), (b), and (c)) | ⁄ | ⁄. |
| 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]