Manufacturers Standardization Society
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:
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 1 1/2 through 12 |