What does Caesar II means when a legend "NO CODE STRESS CHECK PROCESSED" appears in OPE case when checking with B31.4?

There are cases where "CODE STRESS CHECK PASSED" appears in OPE case checking with B31.4.

The system I am ruuning has an underground portion and an aboveground one.

As far I as unsderstand, if there is not CODE CHECK PROCESSED means the system is totally unrestrained, i.e. aboveground.

But this is not my case. That does not make any sense to me.

Thank you very much

Because the B31.4 gves limits to stresses due to sustained loads, thermal expansions and occasional loads only.
But it does not give limits for OPE case.

** Refer to 402.3.2 & 403.3.3 in the code.

So you have to check the OPE loads with your equipment, structure, components, ...etc to ensure that everything is OK.

greggreg
I agree with you in that B31.4 does not gives in any page a limit for operation case; however COADE's interpretation of B31.4 gives an operating stress, in Caesar II and actually I have got stress reports where there are allowables for OPE loadcase, in which case the allowable is 0.9SMYS (according to B31.4 this is the allowable for equivalent tensile stress).

This is why I asked about the "NO CODE STRESS CHECKED PASSED" legend in Caesar II stress reports and then I referred to other times when I have got "CODE STRESS CHECK PASSED".

What is the operating stress given by Caesar II, if B31.4 does not talks anything about?

Please send your CAESAR II model and results to techsupport@coade.com. We'll take a look...

The pipe has to be undergoing compression so generating a higher Tresca stress than a pipe in tension. Its mentioned in the quick reference or tech manual somewhere. If your buried pipe is not long enough or hot enough it remains in tension and the check is not required

MPB
It is right what you are saying; so just let me ask some other simple questions please,
When the code stress check is made or required (i.e. axial stress is compressive), and the "CODE STRESS CHECK PASSED" legend appears in stress summary, what is the equivalente stress: the OPE Stress or the 3D Max Intensity? whatever the yield criteria is used.

I am using von Mises criteria, does any legend with Von Mises Stress or octahedral (even when they are not the same) has to appear in the stress report?

I also have been looking for the 132-column stress report produced by CAESAR where is said that contains a value representative of the maximum stress state trough the cross section, but I have not found it.

Please I need help, since this is my first time with underground pipeline.

Thank you very much

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 system 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 later code has used Allowable stress range.
please explain.......
thanks in advance.