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.
Source: 35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-85, 63 FR 37502, July 13, 1998
Compiled from the Electronic Code of Federal Regulations (eCFR), an editorial compilation and not an official legal edition of the CFR. The official text is the Federal Register and the annual CFR edition. §192.115 on eCFR.