About the Manufacturers Standardization Society

Who is MSS?

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 Modification - Flanges - Pipe Hangers and
Associated Seals

Primary function of MSS

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 24 technical committees to write, revise and reaffirm industry standards.

Manufacturers Standardization Society (MSS)

General

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).

BOARD OF DIRECTORS
Membership Committee Finance Committee
Personnel Committee Coordinating Committee
MSS TECHNICAL COMMITTEES
Cast Iron Valves Non - Ferrous Industrial Valves Iron Flanges & Flanged Fittings Steel Flanges & Flanged Fittings
Under writer Valves Ball Valves Forged Steel Fittings Non - Ferrous Fittings & Flanges
Water Works Valves & Fittings Plastic Valves & Fittings Ferrous Threaded Fittings Wrought Welding Fittings
Steel Valves Diaphragm Valves Actuators & pipe hangers Valve Operation
Butterfly Valves Instrument Valves Pipe Hangers Marking & Terminolo gy
Fuel Gas Valves, Fittings & Pipe Components
Valve Modification
Valve Actuators Quality Standards
Packings & Gaskets

Most recent MSS Standards

SP-6-2012

Standard Finishes for Contact Faces of Pipe Flanges and Connecting-End Flanges of Valves and Fittings

SP-9-2008

Spot Facing for Bronze, Iron and Steel Flanges

SP-25-2008

Standard Marking Systems for Valves, Fittings, Flanges and Unions

SP-42-2009

Corrosion Resistant Gate, Globe, Angle and Check Valves with Flanged and Butt Weld Ends (Classes 150, 300 & 600)

SP-43-2008

Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications
(Errata Sheet issued - February 2010)

SP-44-2010

Steel Pipeline Flanges
(Errata Sheet issued - May 2010)

SP-45-2003 (R 2008)

Bypass and Drain Connections

SP-51-2012

Class 150LW Corrosion Resistant Cast Flanges and Flanged Fittings

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-54-1999 (R 2007)

Quality Standard for Steel Castings for Valves, Flanges, and Fittings and Other Piping Components - Radiographic Examination 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-58-2009

Pipe Hangers and Supports - Materials, Design, Manufacture, Selection, Application, and Installation (ANSI-approved American National Standard)

SP-60-2012

Connecting Flange Joints Between Tapping Sleeves and Tapping Valves

SP-61-2009

Pressure Testing of Valves

SP-65-2012

High Pressure Chemical Industry Flanges and Threaded Stubs for Use with Lens Gaskets

SP-67-2011

Butterfly Valves

SP-68-2011

High Pressure Butterfly Valves with Offset Design

SP-69-2003

Pipe Hangers and Supports - Selection and Application

SP-70-2011

Gray Iron Gate Valves, Flanged and Threaded Ends

SP-71-2011

Gray Iron Swing Check Valves, Flanged and Threaded Ends

SP-72-2010a

Ball Valves with Flanged or Butt-Welding Ends for General Service

SP-75-2008

Specification for High-Test, Wrought, Butt-Welding Fittings

SP-78-2011

Gray Iron Plug Valves, Flanged and Threaded Ends

SP-79-2011

Socket Welding Reducer Inserts

SP-80-2008

Bronze Gate, Globe, Angle, and Check Valves

SP-81-2006a

Stainless Steel, Bonnetless, Flanged Knife Gate Valves

SP-83-2006

Class 3000 Steel Pipe Unions Socket Welding and Threaded

SP-85-2002

Gray Iron Globe & Angle Valves Flanged and Threaded Ends

SP-85-2011

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-87-1991 (R 1996 - Reinstated 2011)

Factory-Made Butt-Welding Fittings for Class I Nuclear Piping Applications

SP-88-2010

Diaphragm Valves

SP-91-2009

Guidelines for Manual Operation of Valves

SP-92-2012

MSS Valve User Guide

SP-93-2008

Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components Liquid Penetrant Examination Method

SP-94-2008

Quality Standard for Ferritic and Martensitic Steel Castings for Valves, Flanges, Fittings, and Other Piping Components - Ultrasonic Examination Method

SP-95-2006

Swage(d) Nipples and Bull Plugs

SP-96-2011

Guidelines on Terminology for Valves and Fittings

SP-97-2012

Integrally Reinforced Forged Branch Outlet Fittings - Socket Welding, Threaded, and Buttwelding Ends

SP-98-2012

Protective Coatings for the Interior of Valves, Hydrants, and Fittings

SP-99-2010

Instrument Valves

SP-100-2009

Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Type Valves

SP-101-1989 (R 2001)

Part-Turn Valve Actuator Attachment - Flange and Driving Component Dimensions and Performance Characteristics

SP-102-1989 (R 2001)

Multi-Turn Valve Actuator Attachment - Flange and Driving Component Dimensions and Performance Characteristics

SP-104-2012

Wrought Copper Solder-Joint Pressure Fittings

SP-105-2010

Instrument Valves for Code Applications

SP-106-2012

Cast Copper Alloy Flanges and Flanged Fittings: Class 125, 150, and 300

SP-108-2012

Resilient-Seated Cast Iron Eccentric Plug Valves

SP-109-2012

Welded Fabricated Copper Solder Joint Pressure Fittings

SP-110-2010

Ball Valves Threaded, Socket Welding, Solder Joint, Grooved and Flared Ends
(Errata Sheet issued - August 2010)

SP-111-2012

Gray-Iron and Ductile-Iron Tapping Sleeves

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-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-113-2012

Connecting Joints between Tapping Machines and Tapping Valves

SP-114-2007

Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000 (ANSI-approved American National Standard)

SP-115-2010

Excess Flow Valves, 1¼ NPS and Smaller, for Natural Gas Service

SP-116-2003

Service-Line Valves and Fittings for Drinking Water Systems

SP-116-2011

Service-Line Valves and Fittings for Drinking Water Systems

SP-117-2011

Bellows Seals for Globe and Gate Valves

SP-118-2007

Compact Steel Globe & Check Valves - Flanged, Flangeless, Threaded & Welding Ends (Chemical & Petroleum Refinery Service)

SP-119-2010

Factory-Made Wrought Belled End Pipe Fittings for Socket Welding

SP-120-2011

Flexible Graphite Packing System for Rising Stem Valves - Design Requirements

SP-121-2006

Qualification Testing Methods for Stem Packing for Rising Stem Steel Valves

SP-122-2012

Plastic Industrial Ball Valves

SP-123-1998 (R 2006)

Non-Ferrous Threaded and Solder-Joint Unions for Use With Copper Water Tube

SP-124-2012

Fabricated Tapping Sleeves

SP-125-2010

Gray Iron and Ductile Iron In-Line, Spring-Loaded, Center-Guided Check Valves

SP-126-2007

Steel In-Line Spring-Assisted Center Guided Check Valves

SP-127-2001

Bracing for Piping Systems Seismic-Wind-Dynamic Design, Selection, Application

SP-128-2012

Ductile Iron Gate Valves

SP-129-2003 (R 2007)

Copper-Nickel Socket Welding Fittings and Unions

SP-130-2003

Bellows Seals for Instrument Valves

SP-131-2010

Metallic Manually Operated Gas Distribution Valves

SP-132-2010

Compression Packing Systems for Instrument Valves

SP-133-2010

Excess Flow Valves for Low Pressure Fuel Gas Appliances

SP-134-2012

Valves for Cryogenic Service Including Requirements for Body/Bonnet Extensions

SP-135-2010

High Pressure Knife Gate Valves

SP-136-2007

Ductile Iron Swing Check Valves

SP-137-2007

Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components

SP-138-2009

Quality Standard Practice for Oxygen Cleaning of Valves & Fittings

SP-139-2010

Copper Alloy Gate, Globe, Angle, and Check Valves for Low Pressure/Low Temperature Plumbing Applications

SP-140-2012

Quality Standard Practice for Preparation of Valves and Fittings for Silicone-Free Service

SP-141-2012

Multi-Turn and Check Valve Modifications

SP-142-2012

Excess Flow Valves for Fuel Gas Service, NPS 1½ through 12

SP-143-2012

Live-Loaded Valve Stem Packing Systems

Reference(s): MSS

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