May 21, 2026

MSS PUBLISHES ERRATA SHEET FOR

Testing of Valves for Cryogenic Hydrogen Service

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces the publication of an Errata Sheet for SP-166-2026, Testing of Valves for Cryogenic Hydrogen Service has been published by MSS.

The Errata Sheet includes a “normative” correction to Table 3. The Errata Sheet is meant for insertion into the current 2026 Edition. Future editions of this Standard Practice will include this corrected information.

SP-166 continues to be maintained under the consensus of MSS Technical Committee 410, Severe & Special Service Valves.

The Errata Sheet has been inserted into MSS SP-166-2026 and is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and can be downloaded (free of charge) at: https://msshq.org/page/AmendmentsErrataNotices.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-26_ErrataSheet- MSS-SP-166-2026_May2026_Final

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For the PDF version of this press release, please click here.

May 11, 2026

MSS PUBLISHES REVISED STANDARD FOR
Gray Iron Plug Valves, Flanged and Threaded Ends

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that MSS SP-78-2026, Gray Iron Plug Valves, Flanged and Threaded Ends has been revised and published by MSS.

This Standard Practice covers:

a)              Gray iron plug valves with flanged or threaded ends.

b)             Valves in sizes and pressure-temperature ratings specified herein for general purpose service.

c)              Includes directly or by reference, stipulations on chemical and mechanical properties of materials and on dimensions of end connections in common use.

SP-78 continues to be maintained under the consensus of MSS Technical Committee 106, Cast Iron Valves.

The Standard Practice, MSS SP-78-2026 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-26_SP-78-2026_May2026_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES NEW STANDARD FOR
Testing of Valves for Cryogenic Hydrogen Service

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that MSS SP-166-2026, Testing of Valves for Cryogenic Hydrogen Service has been published by MSS.

This Standard Practice was developed to meet the specific demands of testing valves for cryogenic hydrogen service, taking these challenges into consideration.  A task group was assembled consisting of subject matter experts in cryogenic hydrogen processing, operations, valve design, manufacturing, and valve testing.  The goal of the task group was to develop a Standard Practice that is based on sound experience and best practices, as well as established practical methods.  This Standard Practice sets challenging but achievable acceptance criteria that ensure the safe and efficient functioning of valves when they are put into service.

This Standard Practice focuses on testing valves for pressure boundary integrity as well as leakage through the valve closure components.  It includes qualification testing requirements, to ensure sound basic design and function of a valve type, as well as production testing to validate that valves put into service meet the requirements of the underlying design type.  Also included in this Standard Practice is the production testing of the valve vacuum jacket, to validate its reliability in service.

This first edition of the Standard Practice seeks to address the most important testing demands for cryogenic hydrogen valves.  This is a broad field, and it will continue to evolve.  Future revisions of this Standard Practice will evolve as well to address the demands of these applications as they arise.

SP-166 continues to be maintained under the consensus of MSS Technical Committee 410, Severe and Special Service Valves.

The Standard Practice, MSS SP-166-2026 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-26_SP-166-2026_May2026_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES REVISED STANDARD FOR
Non-Ferrous Threaded and Solder-Joint Unions for Use with Copper Water Tube

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that MSS SP-123-2026, Non-Ferrous Threaded and Solder-Joint Unions for Use with Copper Water Tube has been revised and published by MSS.

This Standard Practice covers copper and copper alloy unions with metal-to-metal seating, in nominal sizes 1/4 through 4, with solder-joint or threaded end connections, and for use with copper water tube that is compliant with ASTM B88.  Included in this Standard Practice are:

a)    Pressure-temperature ratings

b)    Abbreviations for end connections

c)     Description and terminology of parts

d)    Materials

e)    Size and method of designating openings of fittings

f)     Design elements

g)    Dimensions and tolerances

h)    Testing

i)     Marking

SP-123 continues to be maintained under the consensus of MSS Technical Committee 201, Non-Ferrous Fittings and Flanges.

The Standard Practice, MSS SP-123-2026 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-26_SP-123-2026_Mar2026_Final

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For the PDF version of this press release, please click here.

March 9, 2026

MSS PUBLISHES REVISED STANDARD FOR
Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that MSS SP-43-2026, Wrought and Fabricated Butt-Welding Fittings for Low Pressure, Corrosion Resistant Applications has been revised and published by MSS.

1.1    This Standard Practice provides requirements for wrought and fabricated butt-welding fittings intended for low pressure, corrosion resistant applications.  The requirements covered include pressure ratings, size, marking, materials, metal thickness, dimensions, testing, and tolerances.

1.2    This Standard Practice covers fittings made for use with Schedule 5S or 10S pipe, for all Nominal Pipe Sizes (NPS) listed in ASME B36.19; except that short pattern stub ends suitable for use with Schedule 40S piping are also included.

SP-43 continues to be maintained under the consensus of MSS Technical Committee 113, Wrought Welding Fittings.

The Standard Practice, MSS SP-43-2026 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-26_SP-43-2026_Mar2026_Final

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For the PDF version of this press release, please click here.

March 5, 2026

MSS INITIATES PINS FOR AMERICAN NATIONAL STANDARD FOR 
Corrosion Resistant Pipe Fittings, Threaded and Socket Welding, Class and 1000

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that a Project Initiation has been created with ANSI for MSS SP-114-2026, Corrosion Resistant Pipe Fittings, Threaded and Socket Welding, Class and 1000.

This document established a standard for corrosion resistant pipe fittings, threaded and socket-welding.  Class 150 and Class 1000, produced for a number of years by various manufacturers to somewhat different dimensions although basically similar in principle.

SP-114 continues to be maintained under the consensus of MSS Technical Committee 108, Ferrous Threaded Fittings.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-26_SP-114 PINS Announcement

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For the PDF version of this press release, please click here.

February 10, 2026

MSS PUBLISHES REVISED AMERICAN NATIONAL STANDARD FOR 
STEEL PIPELINE FLANGES

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that ANSI/MSS SP-44-2026, Steel Pipeline Flanges has been approved by the American National Standards Institute (ANSI) as a revised American National Standard (ANS) and published by MSS.

This Standard Practice covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for steel pipeline flanges.  The welding neck type flanges shall be forged steel, and the blind flanges may be made from either forged steel or from steel plate. SP-44 continues to be maintained under the consensus of MSS Technical Committee 110, Steel Flanges & Flanged Fittings.

The revised ANSI-approved American National Standard edition, ANSI/MSS SP-44-2026 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-26_SP-44-2026_Feb26_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES ERRATA SHEET FOR MSS SP-160-2024
Valves for Hydrogen Fluoride Alkylation Service

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces the publication of an Errata Sheet for SP-160-2024, Valves for Hydrogen Fluoride Alkylation Service has been published by MSS.

The Errata Sheet includes a “normative” correction to Section 6.2.5. The Errata Sheet is meant for insertion into the current 2024 Edition. Future editions of this Standard Practice will include this corrected information.

SP-160 continues to be maintained under the consensus of MSS Technical Committee 410, Severe & Special Service Valves.

The Errata Sheet has been inserted into MSS SP-160-2024 and is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and can be downloaded (free of charge) at: https://msshq.org/page/AmendmentsErrataNotices.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-26_ErrataSheet- MSS-SP-160-2024_Feb2026_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES ERRATA SHEET FOR
Cast Copper Alloy Flanges and Flanged Fittings: Class 125, 150 and 300

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces the publication of an Errata Sheet for SP-106-2025, Cast Copper Alloy Flanges and Flanged Fittings: Class 125, 150 and 300  has been published by MSS.

The Errata Sheet includes an “editorial” correction to Section 6.2.1. The Errata Sheet is meant for insertion into the current 2025 Edition. Future editions of this Standard Practice will include this corrected information.

SP-106 continues to be maintained under the consensus of MSS Technical Committee 201, Non-Ferrous Fittings & Flanges.

The Errata Sheet has been inserted into MSS SP-106-2025 and is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and can be downloaded (free of charge) at: https://msshq.org/page/AmendmentsErrataNotices.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-26_ErrataSheet- MSS-SP-106-2025_Jan2026_Final

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For the PDF version of this press release, please click here.

December 12, 2025

MSS PUBLISHES REVISED STANDARD FOR
Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components — Radiographic Examination Method

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that MSS SP-54-2025, Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components — Radiographic Examination Method  has been revised and published by MSS.

1.1    This Standard Practice provides methods and acceptance standards for the film method of radiographic examination of steel castings for valves, flanges, fittings, and other piping components.

This Standard Practice is applicable to the initial examination of castings and toward the examination of casting repairs.

1.2    The methods contained in this Standard Practice provide uniform procedures that will produce satisfactory and consistent results upon which the acceptance standards of Sections 5 and 6 may be used.

1.3    This examination guide may be used on a voluntary basis or when specified in an inquiry, contract, or order, and when mutually agreed upon by the manufacturer and the purchaser.

1.4    It is difficult to rigidly interpret radiographs to a set of acceptance standards.  Consequently, there is a need for close cooperation between the manufacturer and the purchaser in applying radiographic acceptance standards.

SP-54 continues to be maintained under the consensus of MSS Technical Committee 304, Quality Standards.

The Standard Practice, MSS SP-54-2025 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-54-2025_Dec2025_Final

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 For the PDF version of this press release, please click here.

December 11, 2025

MSS PUBLISHES REVISED STANDARD FOR
Quality Standard for Steel Castings Used in Standard Class Steel Valves — Sampling Method for Evaluating Casting Quality

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that MSS SP-147-2025, Quality Standard for Steel Castings Used in Standard Class Steel Valves — Sampling Method for Evaluating Casting Quality has been revised and published by MSS.

This Standard Practice provides minimum guidance for the quality of pressure containing steel castings used in the manufacture of standard class, cast valves compliant with ASME B16.34.  It covers castings made by both the sand and investment casting methods.  Acceptance standards, which provide for a minimum quality level for Standard Class cast steel valve castings, are detailed within this document.

SP-147 continues to be maintained under the consensus of MSS Technical Committee 304, Quality Standards.

The Standard Practice, MSS SP-147-2025 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-147-2025_Dec2025_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES NEW STANDARD FOR
Protection of Valves, Fittings, and Actuators from Damage during Surface Preparation and Application of Coatings

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that MSS SP-164-2025, Protection of Valves, Fittings, and Actuators from Damage during Surface Preparation and Application of Coatings has been published by MSS.

1.1   This Standard Practice outlines the general requirements for protecting sensitive external components and surface areas of valves, fittings, and actuators from damage during surface preparation and application of protective coatings.

1.2   The purpose of this Standard Practice is to ensure that assembled valves, fittings, and actuators are not rendered unfit for service or inoperable as a result of poor protective measures being undertaken before and during abrasive blast cleaning and coating operations.  This Standard Practice does not apply to the cleaning of component parts prior to initial manufacturing and assembly.

SP-164 continues to be maintained under the consensus of MSS Technical Committee 304, Quality Standards.

The Standard Practice, MSS SP-164-2025 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-164-2025_Dec2025_Final

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For the PDF version of this press release, please click here.

November 18, 2025

MSS PUBLISHES REVISED AMERICAN NATIONAL STANDARD FOR 
VALVES FOR CRYOGENIC SERVICE, INCLUDING REQUIREMENTS FOR BODY/BONNET EXTENSIONS

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that ANSI/MSS SP-134-2025, Valves For Cryogenic Service, Including Requirements For Body/Bonnet Extensions has been approved by the American National Standards Institute (ANSI) as a revised American National Standard (ANS) and published by MSS.

This Standard Practice covers additional requirements for material, design, dimensions, fabrication, non-destructive examination, and pressure testing of metallic valves intended for service at cryogenic temperatures.  Unplanned non-cryogenic events, such as auto-refrigeration during gas blow-down events where low temperatures may result, are outside the scope of this document.  This Standard Practice applies to cryogenic gate, globe, butterfly, ball, and check valves, and may be used in conjunction with other valve-specific standards; including the following identified in this Standard Practice as a parent standard:

ASME B16.34, Valves – Flanged, Threaded, and Welding End

API Std 594, Check Valves: Flanged, Lug, Wafer and Butt-welding

API Spec 6D, Specification for Valves

API Std 600, Steel Gate Valves – Flanged and Butt-welding Ends, Bolted Bonnets

API Std 602, Gate, Globe, and Check Valves for Sizes DN 100 (NPS 4) and Smaller for the Petroleum and Natural Gas Industries

API Std 603, Corrosion-resistant, Bolted Bonnet Gate Valves – Flanged and Butt-welding Ends

API Std 608, Metal Ball Valves – Flanged, Threaded and Welding Ends

API Std 609, Butterfly Valves: Double-flanged, Lug- and Wafer-type, and Butt-welding Ends

API Std 623, Steel Globe Valves- Flanged and Butt-welding Ends, Bolted Bonnets-

SP-134 continues to be maintained under the consensus of MSS Technical Committee 114, Steel Valves.

The revised ANSI-approved American National Standard edition, ANSI/MSS SP-134-2025 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-134-2025_Nov2025_Final

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For the PDF version of this press release, please click here.

November 12, 2025

MSS PUBLISHES REVISED STANDARD FOR
Valves for Use in Hydrogen Peroxide Service

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-150-2025, Valves for Use in Hydrogen Peroxide Service has been revised and published by MSS.

This Standard Practice contains requirements for material, design, fabrication, pressure testing, marking, and preparation for shipment of valves for use in hydrogen peroxide (H₂O₂) service.

SP-150 continues to be maintained under the consensus of MSS Technical Committee 407, Butterfly Valves (primary) and MSS Technical Committee 304, Quality Standards (secondary).

The Standard Practice, MSS SP-150-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-150-2025_Nov25_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES NEW STANDARD FOR
Cable Suspension of Pipe – Materials, Selection, Application, and Installation

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-163-2025, Cable Suspension of Pipe – Materials, Selection, Application, and Installation has been published by MSS.

1.1   This Standard Practice establishes the selection, specification, installation, materials, and testing of fixings and suspension systems for cable used to suspend pipe.

1.2   This Standard Practice establishes the allowable load values for cable suspensions when used to suspend pipe.

1.3   This Standard Practice presents the recommended practice for the suspension of pipe with cable for typically dry, indoor applications only.

1.4   This Standard Practice presents the recommended practice for the selection and application of cable with pipe operating (service) temperatures between -20 °F (-29 °C) and 200 °F (93 °C).

1.5   This Standard Practice establishes recommended procedures for the installation of up to NPS 6 (DN 150) pipe with loads not to exceed 715 lbf (3.19 kN) per suspension point.

1.6   This Standard Practice excludes any pipe which would typically be hung and supported via engineered supports.

SP-163 is maintained under the consensus of MSS Technical Committee 403, Pipe Hangers and Supports.

The Standard Practice, MSS SP-163-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-163-2025_Nov25_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES REVISED STANDARD FOR
Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-100-2025, Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves has been revised and published by MSS.

This Standard Practice delineates a method for qualification of Elastomer Diaphragms, in accordance with methodology and documentation as described in ASME QME-1, Appendix QR-B that are intended for use in Class 2 and 3 diaphragm valves applicable to ASME Boiler and Pressure Vessel Code (BPVC), Section III, Division 1 – Subsection NCD: Class 2 and Class 3 Components.   In addition, this Standard Practice establishes methods for production verification and for the development of service limits for Elastomer Diaphragms.

SP-100 continues to be maintained under the consensus of MSS Technical Committee 406, Diaphragm Valves.

The Standard Practice, MSS SP-100-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-100-2025_Nov25_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES REVISED STANDARD FOR
Cast Copper Alloy Flanges and Flanged Fittings: Class 125, 150 and 300

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-106-2025, Cast Copper Alloy Flanges and Flanged Fittings: Class 125, 150 and 300 has been revised and published by MSS.

1.1            This Standard Practice establishes requirements for cast copper alloy flanges and flanged fittings having dimensions, ratings, and materials not included in ASME B16.24.  Specifically, this Standard Practice encompasses the following:

1.1.1        Solder joint flanges, when made of ASTM B62, Copper Alloy UNS No. C83600, or ASTM B584, Copper Alloy UNS Nos. C83600, C83800, C84400, C87500, and C89836 for rating Class 125 and Class 150.

1.1.2        Threaded flanges and blind flanges, when made of ASTM B584, Copper Alloy UNS Nos. C83600, C83800, and C84400 for rating Class 150 and Class 300.

1.1.3        Flanged fittings, when made of ASTM B584, Copper Alloy UNS Nos. C83600, C83800, C84400, C87500, and C89836 for rating Class 150.

General Note:  With the exception of those products exempted in the Safe Drinking Water Act of the United States, the wetted surfaces of products intended for use in potable water piping systems shall have a weighted average lead (Pb) content less than or equal to 0.25 percent when evaluated in accordance with NSF/ANSI/CAN 372.  See Table 7, Note (e) for solder related requirements.

SP-106 continues to be maintained under the consensus of MSS Technical Committee 201, Non-Ferrous Fittings & Flanges.

The Standard Practice, MSS SP-106-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-106-2025_Oct25_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES REVISED STANDARD FOR
Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-137-2025, Quality Standard for Positive Material Identification of Metal Valves, Flanges, Fittings, and Other Piping Components has been revised and published by MSS.

1.1         This Standard Practice provides methods and acceptance standards for Positive Material Identification (PMI) of metal flanges, fittings, valves, pressure boundary parts of valves, and other piping components.

1.2         The instrumentation used for PMI testing covered by this Standard Practice shall be optical spectroscopy, X-ray fluorescence, or laser induced breakdown spectroscopy.

1.3         This Standard Practice is applicable to the identification process, at point of final inspection or in-process inspection during manufacturing.

1.4         This Standard Practice describes requirements for semi-quantitative analysis used for material grade identification only.  This procedure may not be suitable for certifying the accuracy of material test reports. SP-137 continues to be maintained under the consensus of MSS Technical Committee 304, Quality Standards.

The Standard Practice, MSS SP-137-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-137-2025_Oct25_Final

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For the PDF version of this press release, please click here.

September 11, 2025

MSSPUBLISHESREVISED AMERICAN NATIONAL STANDARD FOR 
PIPE HANGERS AND SUPPORTS | MATERIALS, DESIGN, MANUFACTURE, SELECTION, APPLICATION, AND INSTALLATION

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that ANSI/MSS SP-58-2025, Pipe Hangers and Supports | Materials, Design, Manufacture, Selection, Application, and Installation has been approved by the American National Standards Institute (ANSI) as a revised American National Standard (ANS) and published by MSS.

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. SP-58 continues to be maintained under the consensus of MSS Technical Committee 403, Pipe Hangers & Supports.

The revised ANSI-approved American National Standard edition, ANSI/MSS SP-58-2025 is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-58-2025_Sept2025_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES NEW STANDARD FOR
Large Diameter Slip-On and Lap-Joint Flanges

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-165-2025, Large Diameter Slip-On and Lap-Joint Flanges has been published by MSS.

This Standard Practice covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for forged steel slip-on and lap-joint flanges from NPS 26 through NPS 60.

SP-165 continues to be maintained under the consensus of MSS Technical Committee 110, Steel Flanges & Flanged Fittings.

The Standard Practice, MSS SP-165-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-165-2025_Sept25_Final

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For the PDF version of this press release, please click here.

August 11, 2025

MSS PUBLISHES REVISED STANDARD FOR
Service-Line Valves and Fittings for Drinking Water Systems

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-116-2025, Service-Line Valves and Fittings for Drinking Water Systems has been revised and published by MSS.

This Standard Practice covers valves and fittings in sizes NPS 1/2 through NPS 2, for use in drinking water system service-lines between the main and the meter.

Included are:

a)           Buried valves and fittings that are designed to be in direct contact with the soil (corporation valves, service saddle clamps, and curb valves).

b)          Non-buried valves and fittings that are designed for installation within an enclosure such as a meter box or building structure (meter valves, check valves, meter fittings, and meter setters).

c)           Fittings include various types of couplings and adapters.

Not Included:

a)           Reduced pressure backflow preventers.

SP-116 continues to be maintained under the consensus of MSS Technical Committee 112, Water Works Valves & Fittings.

The Standard Practice, MSS SP-116-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-116-2025_Aug25_Final

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For the PDF version of this press release, please click here.

July 28, 2025

MSS PUBLISHES REVISED STANDARD FOR 
In-Line, Spring-Loaded, Center Guided Check Valves
(Carbon, Alloy Steel, Stainless Steel, and Nickel Alloys)

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-126-2025, In-Line, Spring-Loaded, Center Guided Check Valves (Carbon, Alloy Steel, Stainless Steel, and Nickel Alloys) has been revised and published by MSS.

This Standard Practice covers in-line, center-guided, internally spring-loaded type check valves made of steel, or other alloys listed in ASME B16.34, Table 1.  These valves have the feature of limiting flow to one direction only, are installed in any orientation (horizontal, vertical, or angled), and are intended for use with clean media (i.e., gases and liquids that contain no solids). SP-126 continues to be maintained under the consensus of MSS Technical Committee 114, Steel Valves.

The Standard Practice, MSS SP-126-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-126-2025_Jul25_Final

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For the PDF version of this press release, please click here.

July 1, 2025

MSS PUBLISHES REVISED STANDARD FOR

High-Strength, Wrought, Butt-Welding Fittings

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-75-2025, High-Strength, Wrought, Butt-Welding Fittings has been revised and published by MSS.

This Standard Practice covers factory-made, seamless and electric welded carbon and low-alloy steel, butt-welding fittings for use in high pressure gas and oil transmission and distribution systems; including pipelines, compressor stations, metering and regulating stations, and mains.  SP-75 continues to be maintained under the consensus of MSS Technical Committee 113, Wrought Welding Fittings.

The Standard Practice, MSS SP-75-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-75-2025_Jul25_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES REVISED STANDARD FOR
Metallic Manually Operated Fuel Gas Distribution Valves

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces that SP-131-2025, Metallic Manually Operated Fuel Gas Distribution Valves has been revised and published by MSS.

This Standard Practice covers Metallic Fuel Gas Distribution Valves designed for operation at a maximum of 285 psig, at operating temperatures ranging from -20 °F to 150 °F, and sizes from NPS 1/2 to NPS 12. SP-131 continues to be maintained under the consensus of MSS Technical Committee 501, Fuel Gas Valves, Fittings & Piping Components.

The Standard Practice, MSS SP-131-2025, is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and in book format.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_SP-131-2025_Jun25_Final

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For the PDF version of this press release, please click here.

MSS PUBLISHES ERRATA SHEET FOR
Part-Turn Valve Actuator Attachment | FA Flange and Driving Component Dimensions and Performance Characteristics

Alexandria, VA – The Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry announces the publication of an Errata Sheet for SP-101-2024, Part-Turn Valve Actuator Attachment | FA Flange and Driving Component Dimensions and Performance Characteristics has been published by MSS.

The Errata Sheet includes a “normative” correction to Section 9.3 Figure 3. The Errata Sheet is meant for insertion into the current 2024 Edition. Future editions of this Standard Practice will include this corrected information.

SP-101 continues to be maintained under the consensus of MSS Technical Committees 408, Valve Actuators.

The Errata Sheet has been inserted into MSS SP-101-2024 and is now available from authorized U.S. and global distributors. It has been published in an electronic version (PDF) and can be downloaded (free of charge) at: https://msshq.org/page/AmendmentsErrataNotices.

About MSS

The Manufacturers Standardization Society of the Valve and Fittings Industry, Inc. is a non-profit technical association organized for development and improvement of industry, national and international codes and standards for Valves, Valve Actuators, Valve Modifications, Actuator Mounting Kits, Pipe or Tube Fittings, Flanges, Pipe or Tube Hangers and Supports, and Associated Seals, Springs, Spring Washers, and Fasteners. Since its establishment in 1924, MSS has been dedicated to developing voluntary standards for national and global application, in cooperation with other standardizing bodies and regulatory authorities.

MSS is an American National Standards Institute (ANSI)-accredited standards developer.

The Technical Voice of the Industry®

www.msshq.org

For media inquiries: Contact MSS at (703) 281-6613 or standards@msshq.org.

Release File: MSS-PR-25_ErrataSheet- MSS-SP-101-2024_May2025_Final

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For the PDF version of this press release, please click here.