# -11 Insulation.

**Citation:** 49 CFR 179.201-11  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) Insulation shall be of sufficient thickness so that the thermal conductance at 60 °F. is not more than 0.075 Btu per hour, per square foot, per degree F. temperature differential.

(b) [Reserved]

## Document text

(a) Insulation shall be of sufficient thickness so that the thermal conductance at 60 °F. is not more than 0.075 Btu per hour, per square foot, per degree F. temperature differential.

(b) [Reserved]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-179.201-11>
- Source ID: `ecfr`
- SHA-256: `3a737da036e88b119426c37430ed479aa99add7208a57b414ce19d2eafa3e832`
- Retrieved: 2026-08-20T05:46:20.606Z
- Exported: 2026-08-24T06:25:23.702Z
- Document slug: `49-cfr-179-201-11`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "179",
  "section": "179.201-11",
  "subpart": "Subpart D—Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW)",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```