49 CFR § 179.301 - Individual specification requirements for multi-unit tank car tanks.

---
identifier: "/us/cfr/t49/s179.301"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 179.301 - Individual specification requirements for multi-unit tank car tanks."
title_number: 49
title_name: "Transportation"
section_number: "179.301"
section_name: "Individual specification requirements for multi-unit tank car tanks."
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"
---


# 179.301 Individual specification requirements for multi-unit tank car tanks.

(a) In addition to § 179.300 the individual specification requirements are as follows:

| DOT specification | 106A500-X | 106A800-X | 110A500-W | 110A600-W | 110A800-W | 110A1000-W |
| --- | --- | --- | --- | --- | --- | --- |
| Minimum required bursting pressure, psig | () | () | 1250 | 1500 | 2000 | 2500 |
| Minimum thickness shell, inches | ⁄ | ⁄ | ⁄ | ⁄ | ⁄ | ⁄ |
| Test pressure, psig (see § 179.300-16) | 500 | 800 | 500 | 600 | 800 | 1000 |
| Safety relief devices, psig (see § 179.300-15) |  |  |  |  |  |  |
| Start-to-discharge, or burst maximum, p.s.i. | 375 | 600 | 375 | 450 | 600 | 700 |
| Vapor-tight, minimum psig | 300 | 480 | 300 | 360 | 480 | 650 |
| None specified. |  |  |  |  |  |  |

(b) [Reserved]

[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21355, Nov. 6, 1971; Amdt. 179-40, 52 FR 13049, Apr. 20, 1987; 65 FR 58632, Sept. 29, 2000; 66 FR 45390, Aug. 28, 2001]