MSS SP-51-2000

This standard practice covers a series of cast austenitic type stainless steel flanged fittings and cast and forged type austenitic stainless steel flanges of reduced weight with mating dimensions for assembly with ISO 7005-1, PN20, or ASME B16.5, Class 150 flanges, but idenified as Class 150 LW (Light Weight) and limited to use at reduced pressure-temperature ratings.

This product references:ANSI/ASME B16.5-1996 - Pipe Flanges Flanged Fittings : NPS 1/2 Through NPS 24 (Includes 1998 Addenda)
This product replaces:MSS SP-51-1991(R1995) - Class 150WL Corrosion Resistant Cast Flanges and Flanged Fittings