Pipe Sections for closures در ASME B16.9

Length of pipe sections for closures shall be as follows:

(a) Minimum length of pipe shall be one pipe O.D. for

NPS 14 (DN 350) and smaller.

(b) Minimum length of pipe shall be one-half pipe O.D.

for NPS greater than 14 (DN 350 )

ASME B31.3 2020

341.4.1b(1)

Welds shall also be selected to maximize coverage of intersections with longitudinal joints. When a circumferential weld with an intersecting longitudinal weld(s) is examined, at least the adjacent  38 mm (11∕2 in.)