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#46709 - 01/11/12 09:59 PM WRC Allowable Stress
zul Offline
Member

Registered: 07/24/11
Posts: 15
Loc: Malaysia
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

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#46949 - 01/24/12 09:27 PM Re: WRC Allowable Stress [Re: zul]
zul Offline
Member

Registered: 07/24/11
Posts: 15
Loc: Malaysia
Dear All,

Pls help to advise...

ZUL

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#46950 - 01/24/12 09:43 PM Re: WRC Allowable Stress [Re: zul]
zul Offline
Member

Registered: 07/24/11
Posts: 15
Loc: Malaysia
Dear All,

Pls help to advise...

ZUL

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#46967 - 01/25/12 03:54 AM Re: WRC Allowable Stress [Re: zul]
patelsajit Offline
Member

Registered: 01/06/12
Posts: 23
Loc: Gujarat
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

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#46986 - 01/25/12 12:42 PM Re: WRC Allowable Stress [Re: zul]
corne Offline
Member

Registered: 07/09/07
Posts: 401
Loc: The Netherlands
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.

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#46993 - 01/25/12 06:10 PM Re: WRC Allowable Stress [Re: zul]
zul Offline
Member

Registered: 07/24/11
Posts: 15
Loc: Malaysia

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

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#46996 - 01/26/12 12:21 AM Re: WRC Allowable Stress [Re: zul]
corne Offline
Member

Registered: 07/09/07
Posts: 401
Loc: The Netherlands
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.

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