I am trying to find out if there is a list of materials, yield derated against temperature, that is applicable to ASME B31.4/B31.8.
841.11 (a) lists a general formula of design pressure. The temperature derating factor is obtained per 841.116A
This has also aroused another question in my mind.
IS B31.4/B31.8 limited to 450'F at the higher temperature ???