Requirements for PSVs ASME I and ASME VIII
Requirements for PSVs ASME I and ASME VIII
(OP)
Hello everybody,
Could anybody give explanation about the difference, besides overpressure, between requirements for PSVs ASME I and ASME VIII ?
Thanks you all
Could anybody give explanation about the difference, besides overpressure, between requirements for PSVs ASME I and ASME VIII ?
Thanks you all





RE: Requirements for PSVs ASME I and ASME VIII
Do what everyone else has undertaken - read the individual Codes!!!!
RE: Requirements for PSVs ASME I and ASME VIII
However Section 8 PZVs are used in all applications, it can be used as safety valve, relief valve & Safety relief valves.
RE: Requirements for PSVs ASME I and ASME VIII
ASME Sec I - Safety valves for power boiler, steam generators, They are required to have 3 % Over pressure(OP) over pop point pressure and 3 % blowdown.
ASME Sec VIII - They can be used as safety (compressible) , relief (incompressible) and safety relief valve.
As per section VIII, OP for safety valve and coded relief valves should be 10%. For non-coded relief valve, OP can be 25 %.
Blowdown should range between 5 and 7 % below pop point.