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.

Manufacturers Standardization Society

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

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