Temperature derating factor ( T ) for steel pipe.

The temperature derating factor to be used in the design formula in § 192.105 is determined as follows: Gas temperature in degrees Fahrenheit (Celsius) Temperature derating 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]