Dear Experts,

Did we checked operating stresses in CAESAR II,As I tried to check in Caesar it is showing no allowable specified and stress check not processed.

My question is why we in Caesar doesnot check our systems in Operating stresses.ie W+P+T,while I assume as we already checking our system in sustained (SUS)and expansion(EXP) cases including hyd,occ respectively,Thus we are not taking the pain to check OPE stress checks.

1.Is there any other explaination available???
2.But when refered ASME B31.3(2006 edition) and found that in Appendix P,refering to paragraph P302.3.5 there is (P1a) equation which is truly similar to what is provided at P302.3.5 page 14 in ASME B31.3(2006 edition) for allowable stress range.
here in Appendix P, code is using the Se formulae without libral stresses P17a and while in code is adding Sa which is abcent in P319.9 equation 17.

There code has used terminology of operating Stress range and in the later case code has used Allowable stress range.
And it is required than at what condition, is it at higher operating cycles
And when this checking will be mandatory by code.
Please explain.......
Thanks in advance.

Please use the search function on this forum. Both questions have been answered multiple times.

i have already seen the forum, i didn't find the results in the forum, the forum described only for ASME code B31.4,please give me the respective thread detail if any.

First read this thread, which is a "sticky topic" at the top of the CAESAR II Discussion Forum.

Subsequent to this thread, B31.3 did include Appendix P which does setup the evaluation of an OPE load case. If you want to do this, adjust the "Configuration \ SIFs & Stresses" to turn this option on.

Dear Richard sir,

Thanks for the thread

Sir few questions are still unanswered.
1.If it is required(i.e. Operating Stress).then at what condition?
2.and what is the use of providing this alternating regulation.

thanks and regards

In CAESAR II, if FAC=1, operating and expansion stress will be calculated and limits to these stresses will be provided. FAC=1 indicates that the piping is "fully restrained". There will be no calculated stress for sustained and occasional conditions.
In CAESAR II, if FAC < 1, there will be no allowable limit for operating stress but there will be allowable limits for sustained, expansion and occasional stresses. Operating stress is dependant upon FAC and the axial load (tension vs. compression). Expansion stress range will be dependent on FAC.
Why? Because that's how we read the Code.
Fully-restrainted pipe ("locked in", buried pipe, FAC=1) does not have force-based failure criteria. The operating state of stress must not exceed yield.
Pipe that is not fully-restrained follows the standard expansion, sustained, occasional checks but with a twist. These B31.4 systems are more likely to have a compressive longitudinal stress (as opposed to the typical B31.3 system in tension). With a compressive component, the simple maximum shear stress calculation no longer applies. That's why tension/compression is an issue.