(a) The temperature derating factor to be used in the design formula in section 255.105 is determined as follows:
|
Gas Temp. in degrees Fahrenheit (Celsius) |
Temperature derating factor (T) |
|
250(121) or less |
1.000 |
|
300(149) |
0.967 |
|
350(177) |
0.933 |
|
400(204) |
0.900 |
|
450(232) |
0.867 |
(b) For intermediate gas temperatures, the derating factor is determined by interpolation.