Regulationcurrent
49 CFR 192.115
Temperature derating factor (T) for steel pipe.
Current as of 2026-08-18 Government source
eCFR editorial compilationAuthoritative but unofficial
View source 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.#