I am reviewing a B31.3 stress output report from another stress analysis program. I noticed that the SIF's for the sustained load cases are different than the SIF's for the thermal expansion stress range load cases. Why so? I reviewed Appendix D in B31.3 and cannot find any reference to temperature or E(hot) / E(cold) in any of the notes 1 to 14. Note 7 does not qualify as the piping in the stress analysis model is A335 P11 16" X Sch 40 reducing Tee with 8" X Sch 40 branch. SIF in-plane is 1.41 for sustained loading and 1.89 for thermal loading. 1.41/1.89 = close to 0.75.
Can forum members enlighten me on this regard?
Pat LaPointe
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Pat LaPointe
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