Dears

In CII Technical Referenec Manual it's mentioned that UKOOA does not define occasional loada cases. Meanwhile I tried OCC load cases and I saw that there are allowable stresses defined for it in output.
Would you please clarify?

No reply...

There is no distinct evaluation of occasional stress like you see in the B31 codes. Every state of the piping system should be evaluated. A state could be the operating condition or the combined operating plus occasional condition.