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MANUFACTURERS STANDARDIZATION SOCIETY
MSS is the only organization in the world dedicated exclusively to the technical needs of the valve and fittings industry. Standards and codes are written and revised by 25 technical committees and address topics such as valves, valve actuators, pipe fittings, flanges, and pipe hangers.

Most Popular Titles From MSS:
MSS SP-25-2008
Standard Marking System for Valves, Fittings, Flanges and Unions
ANSI/MSS SP-58-2009
Pipe Hangers and Supports - Materials, Design, Manufacture, Selection, Application, and Installation
ANSI/MSS SP-55-2011
Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components - Visual Method for Evaluation of Surface Irregularities
MSS SP-97-2012
Integrally Reinforced Forged Branch Outlet Fittings - Socket Welding, Threaded and Buttwelding Ends
MSS SP-44-2010
Steel Pipeline Flanges, Includes Errata (May 2011)
MSS SP-75-2008
Specification for High-Test Wrought, Butt-Welding Fittings
MSS SP-53-2012
Quality Standard for Steel Castings and Forgings for Valves, Flanges and Fittings and Other Piping Components-Magnetic Particle Exam Method
MSS SP-6-2012
Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
MSS SP-54-1999 (R2007)
Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components - Radiographic Examination Method
MSS SP-61-2009
Pressure Testing of Valves