P91
P91
(OP)
Folks:
Can anyone tell me how to get a copy of code case 2179-3? I'm trying to get information on P91 use in piping bends.
Can anyone tell me how to get a copy of code case 2179-3? I'm trying to get information on P91 use in piping bends.





RE: P91
RE: P91
It does not provide heat treating parameters for bends. SA-234 WP91 provides N&T requirements for P91. ASME B31.1 only requires that bends be heat treated (Annealed, N&T or Tempered per the Engineer). ASME SEction I does not address heat treatment of induction bends.
While I would advise the use of SA-234 WP91 to be used to specify N&T requirements for induction bends, I would add a minimum hardness requirement of 200 BHN as well as the maximum specified.
RE: P91