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#44656 - 09/13/11 03:02 AM Fatigue Analysis...
zul Offline
Member

Registered: 07/24/11
Posts: 15
Loc: Malaysia
I have a question related to fatigue analysis...

For fatigue analysis, is it require to consider reaction from nozzle loading (force & moment)together with fatigue to determine number of cycle.?

If required,is it PVelite consider?

Because,i have ran fatigue using different software, PV elite & Nozzle pro..

Went i run fatigue using Nozzle pro, the result will be different after i consider effect of the nozzle loading itself.
however, i can't see any different when i using PV elite with or without nozzle loading.

Pls help to advise for my knowledge.

Regards
Zul

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#44702 - 09/14/11 09:12 AM Re: Fatigue Analysis... [Re: zul]
zul Offline
Member

Registered: 07/24/11
Posts: 15
Loc: Malaysia
Anybody Please reply....?????

Regards
Zul

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#44735 - 09/15/11 11:17 AM Re: Fatigue Analysis... [Re: zul]
asd23789 Offline
Member

Registered: 06/08/11
Posts: 113
Loc: India
Dear Zul,

I dont comment on the correctness of PVElite or nozzle pro. I refer your attention to following code statements as per ASME section VIII Div:01.

1) in UG-22 c) superimposed static reactions from weight of attached equipment, such as motors, machinery, other vessels,piping, linings, and insulation;

and

2) in UG-22 (e) cyclic and dynamic reactions due to pressure or thermal variations, or from equipment mounted on a vessel,and mechanical loadings;

Also refer to footnote number 22 under UG-36:

External loadings such as those due to the thermal expansion or unsupported weight of connecting piping have not been evaluated. These factors should be given attention in unusual designs or under conditions of cyclic loading.

Thus considering sustained nozzle loading along with fatigue seems to be a good option. since this may result in different stress loading.
Hope this helps.
Regards
ASD23789

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#44779 - 09/18/11 12:48 AM Re: Fatigue Analysis... [Re: zul]
zul Offline
Member

Registered: 07/24/11
Posts: 15
Loc: Malaysia
Thanks for your advise...

I agreed with your suggestion which same understanding with me. Maybe i need to consider increase thickness of shell or reduce external loading to solve my problem.

can find from PV elite help

"Please note that the program currently DOES NOT perform the complete fatigue analysis per Section VIII Div.2 Appendix 4 & 5 rules. Instead the value of peak stress intensity is reported which can be used by the user to perform fatigue effect comparison."

Regards
Zul

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