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

**Citation:** 49 CFR 179.301  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(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 (1) (1) 1250 1500 2000 2500 Minimum thickness shell, inches 13⁄32 11⁄16 11⁄32 3⁄8 15⁄32 19⁄3

## Document text

(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 (1) (1) 1250 1500 2000 2500 Minimum thickness shell, inches 13⁄32 11⁄16 11⁄32 3⁄8 15⁄32 19⁄32 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 1 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]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-179.301>
- Source ID: `ecfr`
- SHA-256: `ccc8ac2e54fd6490b6096e9aeeed89cd2e86aefa508bab9d7dbd4f40d23e9f31`
- Retrieved: 2026-08-20T05:46:20.606Z
- Exported: 2026-08-22T11:54:39.721Z
- Document slug: `49-cfr-179-301`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "179",
  "section": "179.301",
  "subpart": "Subpart E—Specifications for Multi-Unit Tank Car Tanks (Classes DOT-106A and 110AW)",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```