ASME B31 circumferential weld factor
ASME B31 circumferential weld factor
(OP)
When determining allowable pipe spans, are there any guidelines for what to use for the joint efficientcy of a circumferential butt weld? I found a table for longitudinal weld "quality factors" but nothing for the joints between sections of pipe sections that make up a long pipeline.





RE: ASME B31 circumferential weld factor
The only exception to the above statement is the case of a butt weld of new alloy P112 at operating temps above 1100F; the weld creep strength reduction factor drops below 50% in that one case.
RE: ASME B31 circumferential weld factor
RE: ASME B31 circumferential weld factor
I have seen several studies on flaw size in circ welds by fracture mechanics, mainly incomplete penetration where there was no reduction for any conditions that the pipe would see. The allowable flaw size was quite large in all cases, up to 25% in the case incomplete penetration.