Stainless Steel Socket Weld Pipe Couplings

This specification includes seamless and welded wrought austenitic stainless steel butt welding fittings and consists of two general Classes. WP and CR. Class WP fittings are manufactured to the dimensional requirements of ANSI B16.9 or ANSI B16.28 and have pressure ratings equal to that prescribed for the specific matching pipe. Class CR fittings are manufactured to the dimensional requirements end pressure ratings of MSS SP-43. Both Classes require carbide solution heat treatment which includes rapid cooling to prevent reprecipitation of carbides, Fitting sub-classes covered by ASTM A 403 include the following specific requirements: Sub-class Requirement WP.S Seamless construction WP-W Welded fittings where fitting construction welds are 100% radiographed or ultrasonically examined and where side med. with the addition of filter metal in any starting material (e.g., welded pipe) are 100% radiographed WF-WX Welded fittings where all welds are 100% radiographed or ultrasonically examined. CRSeamless or welded fittings with no nondestructive testing required. Special fittings with sizes and shapes not included in the above dimensional specifications can be ordered per A 403, provided they are marked "S9" and meet all other requirements of the sub-class specified.