The issue of weld layout
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Does ASME specify what the minimum distance between two welds should be? What kind of welds are these two welds? Could it refer to the relationship between a main weld and a secondary weld? If it is mentioned, could you let me know in which chapter and section?
Class A welds: The centerlines of adjacent longitudinal joints should be offset from each other or separated by at least 5 times the thickness of the thicker plate. If this cannot be achieved, radiographic testing shall be performed on a 4-inch (100 mm) length of the longitudinal joints on both sides intersecting each circumferential joint. See VIII-1, UW-9, (d)
If there are two longitudinal seams, the poster may refer to ASME Volume VIII, UW-9 (d); the minimum spacing should be 5 times that of the thicker plate. Otherwise, at least 4 inches on each side of the weld must be available for RT inspection. As for the main welds and the accessory welds, they can intersect with each other; refer to ASME Volume VIII, UG-82.