# Temperature derating factor (T) for steel pipe.

**Citation:** 49 CFR 192.115  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

The temperature derating factor to be used in the design formula in § 192.105 is determined as follows:

Gas temperature in degreesFahrenheit (Celsius) Temperaturederating factor (T) 250 °F (121 °C) or less 1.000 300 °F (149 °C) 0.967 350 °F (177 °C) 0.933 400 °F (204 °C) 0.900 450 °F (232 °C) 0.867

## Document text

The temperature derating factor to be used in the design formula in § 192.105 is determined as follows:

Gas temperature in degreesFahrenheit (Celsius) Temperaturederating factor (T) 250 °F (121 °C) or less 1.000 300 °F (149 °C) 0.967 350 °F (177 °C) 0.933 400 °F (204 °C) 0.900 450 °F (232 °C) 0.867

For intermediate gas temperatures, the derating factor is determined by interpolation.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-85, 63 FR 37502, July 13, 1998]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-192.115>
- Source ID: `ecfr`
- SHA-256: `3ac0d6fd1fd5df7aa55966b552a5b86b794062938557641d4bc6d394dab97340`
- Retrieved: 2026-08-20T05:54:34.435Z
- Exported: 2026-08-22T10:32:53.732Z
- Document slug: `49-cfr-192-115`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "192",
  "section": "192.115",
  "subpart": "Subpart C—Pipe Design",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```