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MSS: Manufacturers Standardization Society of the Valve and Fittings Industry, Inc.

MSS, the Manufacturers Standardization Society of the Valve and Fittings Industry is a non-profit standards developing organization that is devoted to the development of the industry. Standards written by MSS address valves, valve actuators, valve modification, pipe fittings, pipe hangers, pipe supports, flanges, and associated seals. These materials and associated guidelines are used in almost every industry, and are found in facilities for waste management, nuclear energy, and oil refining. Standards from MSS are available both individually, directly through the ANSI webstore, and as part of a Standards Subscription. If you or your organization are interested in easy, managed, online access to standards that can be shared, a Standards Subscription may be what you need - please contact us at: StandardsSubscriptions@ansi.org or 1-212-642-4980 or Request Proposal Price.

Below are MSS's best-selling standards. To find additional standards, please use the search bar above.

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ANSI/MSS SP-58-2018

Pipe Hangers and Supports - Materials, Design, Manufacture, Selection, Application, and Installation

This Standard Practice establishes an industry accepted basis for Manufacturers, Engineers, Erectors, Purchasers, Inspectors, Draftsmen, and others involved in the Materials, Design, Manufacture, Selection, Application, Inspection, and Installation of pipe hangers and supports and their components for piping systems of all service temperatures.


ANSI/MSS SP-55-2011

Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components - Visual Method for Evaluation of Surface Irregularities

This Standard Practice is intended to supplement the requirements of ASTM Specifications A216/A 216M, A217/A217M, A351/A351M, A352/A352M, A3891A389M, A487/A487M, and A744/A744M and to provide a series of reference photographs typical of the various surface irregularities common to steel pressure castings and illustrations of generally acceptable and generally rejectable quality. Table 1 of Section 5 is provided to show MSS interpretation as to the relationship between this Standard Practice and the levels of surface quality illustrated by the comparators and the photographs of the Steel Casting Research and Trade Association (SCRA TA) Comparators for the Definition of Surface Quality of Steel Castings.
For additional nondestructive examinations defining quality of steel castings, this Standard Practice may be supplemented by the following Standard Practices; SP-53 "Magnetic Particle Examination Method", SP-54 "Radiographic Examination Method", SP-93 "Liquid Penetrant Examination Method", SP-94 "Ultrasonic Examination Method", and SP-112 "Visual and Tactile Method".


ANSI/MSS SP-25-2013

Standard Marking System for Valves, Fittings, Flanges, and Unions

This standard marking system applies to valves, fittings, flanges, and unions used in piping connections which include (but are not limited to) flanged, soldered, brazed, threaded, or welded joints.


MSS SP-81-2017

Stainless-Steel or Stainless-Steel-Lined, Bonnetless, Knife Gate Valves with Flanged Ends

This Standard Practice covers all stainless-steel or stainless-steel-lined, cast, or fabricated bonnetless, knife gate valves with flanged ends from size NPS 2 (DN 50) through NPS 36 (DN 900).


ANSI/MSS SP-114-2018

Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000

This Standard Practice for corrosion resistant pipe fittings threaded and socket-welding, Class 150 and 1000, establishes requirements for the following: a) Pressure-temperature ratings; b) Size and method of designating openings of reducing fittings; c) Marking; d) Minimum requirements for materials; e) Dimensions and tolerances; f) Threading; g) Testing.


ANSI/MSS SP-114-2018

Corrosion Resistant Pipe Fittings Threaded and Socket Welding Class 150 and 1000

This Standard Practice for corrosion resistant pipe fittings threaded and socket-welding, Class 150 and 1000, establishes requirements for the following: a) Pressure-temperature ratings; b) Size and method of designating openings of reducing fittings; c) Marking; d) Minimum requirements for materials; e) Dimensions and tolerances; f) Threading; g) Testing.


MSS SP-127-2014a

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

This Standard Practice establishes the material, design, fabrication, and inspection criteria to be used in the manufacture, selection, and application of standard types of bracing assemblies. This Standard Practice presents recommended guidelines for providing stability in piping systems for protection against seismic, wind, and other dynamic forces. This Standard Practice is intended for use on piping systems where formal engineered bracing design may not have been performed. Note that local and/or national building codes or regulations may supersede or augment these requirements. This Standard Practice applies to rigidly connected metallic pipe only (welded, flanged, mechanical-jointed, etc.). For other types of pipe and pipe connections, contact the applicable pipe manufacturer for information.


MSS SP-53-2012

Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components

This Standard Practice provides methods and acceptance standards for magnetic particle examination of ferritic steel valves, flanges, fittings, and other piping components by use of dry magnetic powder or wet magnetic particles. It is applicable to the examination of repairs and the initial examination of castings and forgings.


MSS SP-6-2017

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

Pertains to the finish of gasket contact faces of pipe flanges and connecting end flanges of valves and fittings.


MSS SP-70-2011

Gray Iron Gate Valves Flanged and Threaded Ends

This Standard Practice covers gray iron gate valves with flanged or threaded ends


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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