Hello Borzki,

I think you have to use codes for BPV. And it is same as for ASME and EN codes. The B31J it is piping code and applicated for beam models only.

But we can try to compare results obtained by both types of codes. And do not forget that in piping codes SIF for a butt weld is included already (1.8-2). Also SIF in pipe code some times conservarive and for some pair D/t it is not realistic. Becouse one formula should cover all variations.


See codes: ASME BPV Sec. III (NB-3200 DESIGN BY ANALYSIS) or BPV Sec. VIII Div2 (Part 5 DESIGN BY ANALYSIS). Or EN 13445.

Best regards Pavel