# Temperature derating factor (T) for steel pipe.

- **operation:** document
- **citation:** 49 CFR 192.115
- **title:** Temperature derating factor (T) for steel pipe.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** 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
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- **app url:** https://regulus.evalyn.ai/document/49-cfr-192-115
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-192.115
**body:**

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]
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