# -1 Individual specification requirements.

**Citation:** 49 CFR 179.221-1  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

In addition to § 179.220, the individual specification requirements are as follows:

DOT specification Insulation Burstingpressure(psig) Minimumplatethickness (inches) Test pressure (psig) Bottomoutlet Bottomwashout Reference(179.221-***) 115A60ALW Yes 240 3⁄16 60 Optional. Optional 115A60W1 Yes 240

## Document text

In addition to § 179.220, the individual specification requirements are as follows:

DOT specification Insulation Burstingpressure(psig) Minimumplatethickness (inches) Test pressure (psig) Bottomoutlet Bottomwashout Reference(179.221-***) 115A60ALW Yes 240 3⁄16 60 Optional. Optional 115A60W1 Yes 240 1⁄8 60 Optional Optional 1 115A60W6 Yes 240 1⁄8 60 Optional Optional 1

[Amdt. 170-52, 61 FR 28681, June 5, 1996, as amended at 62 FR 51561, Oct. 1, 1997; 66 FR 45390, Aug. 28, 2001]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-179.221-1>
- Source ID: `ecfr`
- SHA-256: `690b5dc2679f209c0b8ea0739be29877efe420b79a03ca360f16a8a68a740c68`
- Retrieved: 2026-08-20T05:46:20.606Z
- Exported: 2026-08-23T21:48:13.554Z
- Document slug: `49-cfr-179-221-1`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "179",
  "section": "179.221-1",
  "subpart": "Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```