P91 material
P91 material
(OP)
Should the hydrotest medium(demineralized water)need to be maintained at any minimum temperature while pressure testing P91 piping systems although ASME B31.1 code does not specify so?
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RE: P91 material
per Mannesman Valloured the followign impact energies are associated with different PWHT temps and hold times:
PWHT temp for time= impact energy @ hydrotest temp
730 C for 2h= 35 J@ 20C
730 C for 5 hr=55 J @ 20 C
750 C for 2 h = 55 J @ 20 C
750 C for 5 h= 81 J @ 20 C
RE: P91 material
RE: P91 material