Vessel Openings
Openings are required to attach piping, mechanical equipment and instrumentation, and to permit inspections. The physical boundary between the jurisdiction of the ASME Code and the appropriate piping code is one of the following interfaces:
• Welded pipe—between the first circumferential joint of pipe and the nozzle
• Screwed connections—first threaded joint
• Flanged connections—first flange face
• Other connections—first sealing surface
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