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.
49 C.F.R. §192.115