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Speciality Pipe
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PIPING MATERIAL SPECIFICATION (PMS)
gailtenders.in8.3 Neck of weld neck (WN) flanges shall suit pipe bore and thickness. 8.4 Bore of socket welded (SW) flanges shall suit pipe O.D. and its thickness. 8.5 Threads for screwed flanges, if used, shall conform to American Standard taper as per ASME B 1.20.1 NPT. 8.6 Sizes for blind flanges shall be indicated by nominal pipe size.