ASME 16.5 Press-Temp Rating
ASME 16.5 Press-Temp Rating
(OP)
Does anyone know the pressure rating for carbon and stainless steel classes below -20 deg. F? Everything I've researched stops at this temperature. I know some nickel alloys are for low temp (cryogenic service). I have an application for -25 deg. F and need to know the pressure limit.





RE: ASME 16.5 Press-Temp Rating
The reason for the -20 deg F low temperature limit is that impact testing is not required for use at or above this service temperature. For those material groups that are selected for low temperature service, below -20 deg F, the maximum pressure rating would still apply for the -20 deg F service temperature in ASME B 16.5 provided the code of construction requirements for impact testing are met.
RE: ASME 16.5 Press-Temp Rating
Please refer B16.5 para 2.4 and 2.5.3.
For CS, check the impact testing required or not as per code.
For SS, generally impact testing for low tempreture not required.