U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
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 |
