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The American National Standards Institute

The American National Standards Institute
ANSI is a private, non-profit organization. Its main function is to administer and coordinate the U.S. voluntary standardization and conformity assessment system. It provides a forum for development of American national standards. ANSI assigns "schedule numbers". These numbers classify wall thicknesses for different pressure uses.

Manufacturers Standardization Society

The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for: Valves, Valve Actuators, Valve Modification, Pipe Fittings, Pipe Hangers, Pipe Supports, Flanges and Associated Seals

  • MSS SP-43 - Wrought Stainless Steel Butt-Welding Fittings Including Reference to Other Corrosion Resistant Materials
  • MSS SP-75 - Specifications for High Test Wrought Buttwelding Fittings
  • MSS SP-73 - Brazing Joints for Copper and Copper Alloy Pressure Fittings
  • MSS SP-83 - Class 3000 Steel Pipe Unions, Socket-Welding and Threaded
  • MSS SP-97 - Integrally Reinforced Forged Branch Outlet Fittings — Socket Welding, Threaded, and Buttwelding Ends
  • MSS SP-106 - Cast Copper Alloy Flanges and Flanged Fittings Class 125,150, and 300
  • MSS SP-119 - Factory-Made Wrought Belled End Socket Welding Fittings
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