ASME Section VIII Div. 1 requires that when longitudinal seams on different courses meet they shall be staggered or separated by no less than 5 times the thickness of the thicker plate. (unless at least 4" on each side of the circumferential weld are radiographed). Ref. UW-9 (d). Is anyone aware of a like requirement in ASME B31.3? I can't find one and I know it's good workmanship to do this, but is it mandatory?