Manufacturers Standardization Society (MSS)

MSS(Manufacturers Standardization Society) 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.

Officially founded in 1924, 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, Pipe Fittings, Valve Modifications, Flanges, Pipe Hangers, Assorted Seals

The primary function of MSS is to provide its members the means to develop engineering standard practices for the use and benefit of the industry and users of its products. The Society, the only organization dedicated solely to the technical needs of the industry, is currently comprised of 25 technical committees to write, revise and reaffirm industry standards.

In its leadership role, the Society also contributes to and monitors code and standard development activities worldwide. MSS, in cooperation with other standardizing bodies, appoints representatives to other standardization organization committees to share the views and objectives of the Society.

Standards organizations in which MSS currently participates include, but are not limited to, the American Society of Mechanical Engineers (ASME), American National Standards Institute (ANSI), American Society for Testing and Materials (ASTM), American Petroleum Institute (API), American Waterworks Association (AWWA) and the National Fire Protection Association (NFPA).

At the international level, MSS representatives have served as leaders in U.S. delegations in many of the meetings of ISO working groups, subcommittees, and main committees addressing applicable areas of interest.

Most recent MSS Standards:

StandardApplications
SP-6-2012Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings
SP-25-2008Standard Marking Systems for Valves, Fittings, Flanges and Unions
SP-43-2008Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications(Errata Sheet issued – February 2010)
SP-45-2003 (R 2008)Bypass and Drain Connections
SP-53-1999 (R 2007)Quality Standard for Steel Castings and Forgings for Valves, Flanges and Fittings and Other Piping Components – Magnetic Particle Exam Method
SP-55-2011Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components – Visual Method for Evaluation of Surface Irregularities (ANSI-approved American National Standard)
SP-60-2012Connecting Flange Joints Between Tapping Sleeves and Tapping Valves
SP-65-2012High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets
SP-68-2011High Pressure Butterfly Valves with Offset Design
SP-70-2011Gray Iron Gate Valves, Flanged and Threaded Ends
SP-72-2010aBall Valves with Flanged or Butt-Welding Ends for General Service
SP-78-2011Gray Iron Plug Valves, Flanged and Threaded Ends
SP-80-2008Bronze Gate, Globe, Angle, and Check Valves
SP-83-2006Class 3000 Steel Pipe Unions Socket Welding and Threaded
SP-85-2011Gray Iron Globe & Angle Valves, Flanged and Threaded Ends
SP-87-1991 (R 1996 – Reinstated 2011)Factory-Made Butt-Welding Fittings for Class I Nuclear Piping Applications
SP-91-2009Guidelines for Manual Operation of Valves
SP-93-2008Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components Liquid Penetrant Examination Method
SP-95-2006Swage(d) Nipples and Bull Plugs
SP-97-2012Integrally Reinforced Forged Branch Outlet Fittings – Socket Welding, Threaded, and Buttwelding Ends
SP-99-2010Instrument Valves
SP-101-1989 (R 2001)Part-Turn Valve Actuator Attachment – Flange and Driving Component Dimensions and Performance Characteristics
SP-104-2012Wrought Copper Solder-Joint Pressure Fittings
SP-106-2012Cast Copper Alloy Flanges and Flanged Fittings: Class 125, 150, and 300
SP-109-2012Welded Fabricated Copper Solder Joint Pressure Fittings
SP-111-2012Gray-Iron and Ductile-Iron Tapping Sleeves
SP-112-ComparatorQuality Standard for Evaluation of Cast Surface Finishes -Visual and Tactile Method. This SP must be used with a 10-surface, three dimensional Cast Surface Comparator, which is a necessary part of the Standard.
SP-114-2007Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000 (ANSI-approved American National Standard)
SP-116-2003Service-Line Valves and Fittings for Drinking Water Systems
SP-117-2011Bellows Seals for Globe and Gate Valves
SP-119-2010Factory-Made Wrought Belled End Pipe Fittings for Socket-Welding
SP-121-2006Qualification Testing Methods for Stem Packing for Rising Stem Steel Valves
SP-123-1998 (R 2006)Non-Ferrous Threaded and Solder-Joint Unions for Use With Copper Water Tube
SP-125-2010Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves
SP-127-2001Bracing for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application
SP-129-2003 (R 2007)Copper-Nickel Socket-Welding Fittings and Unions
SP-131-2010Metallic Manually Operated Gas Distribution Valves
SP-133-2010Excess Flow Valves for Low Pressure Fuel Gas Appliances
SP-135-2010High Pressure Knife Gate Valves
SP-137-2007Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components
SP-139-2010Copper Alloy Gate, Globe, Angle, and Check Valves for Low Pressure/Low Temperature Plumbing Applications
SP-141-2012Multi-Turn and Check Valve Modifications
SP-143-2012Live-Loaded Valve Stem Packing Systems
SP-9-2008Spot Facing for Bronze, Iron and Steel Flanges
SP-42-2009Corrosion Resistant Gate, Globe, Angle and Check Valves with Flanged and Butt Weld Ends (Classes 150, 300 & 600)
SP-44-2010Steel Pipeline Flanges, (Errata Sheet issued – May 2010)
SP-51-2012Class 150LW Corrosion Resistant Cast Flanges and Flanged Fittings
SP-54-1999 (R 2007)Quality Standard for Steel Castings for Valves, Flanges, and Fittings and Other Piping Components – Radiographic Examination Method
SP-58-2009Pipe Hangers and Supports – Materials, Design, Manufacture, Selection, Application, and Installation (ANSI-approved American National Standard)
SP-61-2009Pressure Testing of Valves
SP-67-2011Butterfly Valves
SP-69-2003Pipe Hangers and Supports – Selection and Application
SP-71-2011Gray Iron Swing Check Valves, Flanged and Threaded Ends
SP-75-2008Specification for High-Test, Wrought, Butt-Welding Fittings
SP-79-2011Socket Welding Reducer Inserts
SP-81-2006aStainless Steel, Bonnetless, Flanged Knife Gate Valves
SP-85-2002Gray Iron Globe & Angle Valves Flanged and Threaded Ends
SP-86-2009Guidelines for Metric Data in Standards for Valves, Flanges, Fittings, and Actuators(Errata Sheet issued – July 2011)
SP-88-2010Diaphragm Valves
SP-92-2012MSS Valve User Guide
SP-94-2008Quality Standard for Ferritic and Martensitic Steel Castings for Valves, Flanges, Fittings, and Other Piping Components – Ultrasonic Examination Method
SP-96-2011Guidelines on Terminology for Valves and Fittings
SP-98-2012Protective Coatings for the Interior of Valves, Hydrants, and Fittings
SP-100-2009Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Type Valves
SP-102-1989 (R 2001)Multi-Turn Valve Actuator Attachment – Flange and Driving Component Dimensions and Performance Characteristics
SP-105-2010Instrument Valves for Code Applications
SP-108-2012Resilient-Seated Cast Iron Eccentric Plug Valves
SP-110-2010Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends(Errata Sheet issued – August 2010)
SP-112-2010Quality Standard for Evaluation of Cast Surface Finishes -Visual and Tactile Method. This SP must be used with a 10-surface, three dimensional Cast Surface Comparator, which is a necessary part of the Standard.
SP-113-2012Connecting Joints between Tapping Machines and Tapping Valves
SP-115-2010Excess Flow Valves, 1 1/4 NPS and Smaller, for Natural Gas Service
SP-116-2011Service-Line Valves and Fittings for Drinking Water Systems
SP-118-2007Compact Steel Globe & Check Valves – Flanged, Flangeless, Threaded & Welding Ends (Chemical & Petroleum Refinery Service)
SP-120-2011Flexible Graphite Packing System for Rising Stem Valves – Design Requirements
SP-122-2012Plastic Industrial Ball Valves
SP-124-2012Fabricated Tapping Sleeves
SP-126-2007Steel In-Line Spring-Assisted Center Guided Check Valves
SP-128-2012Ductile Iron Gate Valves
SP-130-2003Bellows Seals for Instrument Valves
SP-132-2010Compression Packing Systems for Instrument Valves
SP-134-2012Valves for Cryogenic Service Including Requirements for Body/Bonnet Extensions
SP-136-2007Ductile Iron Swing Check Valves
SP-138-2009Quality Standard Practice for Oxygen Cleaning of Valves & Fittings
SP-140-2012Quality Standard Practice for Preparation of Valves and Fittings for Silicone-Free Service
SP-142-2012Excess Flow Valves for Fuel Gas Service, NPS 1½ through 12

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