MSS - SP

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Manufacturers Standardization Society and Industry - Standard Practices 

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. 

Here is a list of standards devised by this Institute:

1.   MSS-SP-6 = Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
2.   MSS-SP-9 = Spot Facing for Bronze, Iron and Steel Flanges
3.   MSS-SP-25 = Standard Marking Systems for Valves, Fittings, Flanges, and Unions
4.   MSS-SP-42 = Class 150 (PN 20) Corrosion Resistant Gate, Globe, Angle and Check Valves With Flanged and Butt Weld Ends
5.   MSS-SP-43 = Wrought Stainless Steel Butt-Welding Fittings Including Reference to Other Corrosion Resistant Materials
6.    MSS-SP-44 = Steel Pipe Line Flanges
7.    MSS-SP-45 = Bypass and Drain Connections
8.    MSS-SP-51 = Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings
9.    MSS-SP-58 = Pipe Hangers and Supports
10.  MSS-SP-61 : Pressure testing of valves 
11.  MSS-SP-65 = High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets
12. MSS-SP-67 = Guidelines for butterfly valve design, testing, and marking and covers different types
13.  MSS-SP-69 = Pipe Hangers and Suports
14.  MSS-SP-70 = Cast Iron Gate Valves, Flanged and Threaded Ends
15.  MSS-SP-71 = Gray Iron Swing Check Valves, Flanged and Threaded Ends
16.  MSS-SP-72 = Ball Valves With Flanged or Buttwelding Ends for General Service
17.  MSS-SP-75 = Specifications for High Test Wrought Buttwelding Fittings
18.  MSS-SP-79 = Socket-Welding Reducer Inserts
19.  MSS-SP-81 = Stainless Steel, Bonnetless, Flanged, Knife Gate Valves
20.  MSS-SP-83 = Class 3000 Steel Pipe Unions, Socket-Welding and Threaded
21.  MSS-SP-85 = Gray Iron Globe and Angle Valves, Flanged and Threaded Ends
22.  MSS-SP-88 = Diaphragm Type Valves
23.  MSS-SP-90 = Pipe hangers and supports - guidelines on terminology
24. MSS-SP-92 = MSS valves user guide
25.  MSS-SP-95 = Swage(d) Nipples and Bull Plugs
26.  MSS-SP-97 = Integrally Reinforced Forged Branch Outlet Fittings

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