MSS Standards for individual purchase

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  • Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves

    Standard [CURRENT] 2025

    MSS SP-100:2025

    Qualification Requirements for Elastomer Diaphragms for Nuclear Service Diaphragm Valves

    This Standard Practice delineates a method for qualification of elastomer diaphragms, in accordance with methodology and documentation as described in Appendix QR-B of ASME QME-1, that are ...

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

    Standard [CURRENT] 2025

    MSS SP-106:2025

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

    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 ...

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  • Quality Standard for Steel Castings Used in Standard Class Steel Valves - Sampling Method for Evaluating Casting Quality

    Standard [CURRENT] 2025

    MSS SP-147:2025

    Quality Standard for Steel Castings Used in Standard Class Steel Valves - Sampling Method for Evaluating Casting Quality

    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 ...

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  • Cable Suspension of Pipe - Materials, Selection, Application, and Installation

    Standard [CURRENT] 2025

    MSS SP-163:2025

    Cable Suspension of Pipe - Materials, Selection, Application, and Installation

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

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

    Standard [CURRENT] 2025

    MSS SP-55:2025

    Quality Standard for Iron and 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/A216M, A217/A217M, A351/A351M, A352/A352M, A389/A389M, A487/A487M, and A744/A744M and provide a series ...

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  • Guidelines for Manual Operation of Valves

    Standard [CURRENT] 2025

    MSS SP-91:2025

    Guidelines for Manual Operation of Valves

    The purpose of this Standard Practice is to provide valve users with information for use in evaluating the manual operation of valves. This Standard Practice provides guidelines for the operation ...

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  • Metallic Manually Operated Fuel Gas Distribution Valves

    Standard [CURRENT] 2025

    MSS SP-131:2025

    Metallic Manually Operated Fuel Gas Distribution Valves

    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 ...

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  • Design Requirements for Actuator-to-Valve Mounting Components

    Standard [CURRENT] 2025

    MSS SP-162:2025

    Design Requirements for Actuator-to-Valve Mounting Components

    This Standard Practice provides requirements for actuator to valve mounting components, including design constraints, allowable stresses, marking, and performance criteria.

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

    Standard [CURRENT] 2024

    MSS SP-93:2024

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

    This Standard Practice provides methods and acceptance standards for liquid penetrant examination of steel castings and forgings for valves, flanges, fittings and other piping components. It is ...

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  • Flexible Graphite Packing Sealing for Rising Stem Valves

    Standard [CURRENT] 2024

    MSS SP-120:2024

    Flexible Graphite Packing Sealing for Rising Stem Valves

    This Standard Practice is applicable to isolation valves that use flexible graphite compression packing stem sealing to achieve reduced or low emissions. This Standard Practice also encompasses ...

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