Dear All,

My client has comment on my calculation, allowable stress on WRC result shall be compare with 0.9*Ys. This is different what i understood because 0.9*Ys stress only applicable for hydro test condition which on this condition on piping load will involve.

Normally, allowable stress can calculate as per below :

Pm = Sa
Pm + Pl = 1.5*Sa
Pm + Pl + Q = 3*sa

can anybody help tell me, which cross on WRC bulletin stated stress due to piping load shall be compared with allowable stress instead of 0.9*Ys.

Pls advise & correct if i wrong.

TQ

ZUL

Dear All,

Pls help to advise...

ZUL

Dear All,

Pls help to advise...

ZUL

Dear ZUL

According to me, in WRC 107 no allowable stress is mentioned,it is only calculate the calculated stress.
But IN WRC 297, For Pm+Pb+Q they are giving reference of 3*Sm.

Regards
Sajit Patel

Agree with Sajit that WRC-107 doesn't give allowables. The allowables you mention and that are used for evaluation are taken from ASME VIII div. 2.
It's best to point your client to that code.

I Agree with Sajit, That mean WRC-107 analysis based on ASME VIII div.2 ?

So what the allowable stress ? it is correct what PV elite implemented or

should be compare with 0.9 x Sy ?

Pls help to advise ...

Regard
ZUL

WRC-107 analysis determines occuring stresses in 4 points on a shell around an attachment.
What PV-Elite does is calculate the stresses according to WRC-107 and applies the maximum allowable stresses according to ASME VIII div. 2 (alternative design approach).
I have no idea why you should compare the calculated stresses to 0.9Sy.