Mr. Hill,
Thanks for your response. yes I have the B31.7 Code (I guess I have copies of all B31 Codes since 1955) but I need some guidance in setting up the load cases in PIPESTRESS. Interestingly, B31.7 does not use a "thermal stress only" case. Rather it calls for a primary plus secondary stress case with the maximum allowable stress being 3Sm.
Interesting because the new 2004 B31.3 Code includes a new Appendix "P" that uses the same approach 35 years after B31.7 introduced it.
Thanks again, John.