MSS Standards for individual purchase

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  • High Pressure Butterfly Valves with Offset Design

    Standard [CURRENT] 2021

    MSS SP-68:2021

    High Pressure Butterfly Valves with Offset Design

    This Standard Practice covers design requirements, test performance, marking requirements, and nomenclature for butterfly valves designed for high pressure performance, having a seat plane offset ...

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  • High Pressure Knife Gate Valves

    Standard [CURRENT] 2021

    MSS SP-135:2021

    High Pressure Knife Gate Valves

    This Standard Practice covers the construction requirements for lug- and wafer-type knife gate valves made from ASME Code materials and meeting the applicable gate valve requirements of ASME B16.34.

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

    Standard [CURRENT] 2021

    MSS SP-81:2021

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

    Standard Practice (SP)-81 has been serving the industry for over 46 years; covering all stainless-steel or stainless-steel-lined, cast, or fabricated bonnetless, knife gate valves with flanged ...

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

    Standard [CURRENT] 2021

    MSS SP-140:2021

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

    This Standard Practice establishes general requirements for valves and fittings for use in silicone-free service requiring an increased level of cleanliness. Specific requirements include: a) ...

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  • Copper-Nickel Fittings

    Standard [CURRENT] 2021

    MSS SP-129:2021

    Copper-Nickel Fittings

    This Standard Practice establishes requirements for copper-nickel fittings from Nominal Pipe Size (NPS) 1/4 through NPS 12 (or as noted), for use with pipe manufactured to one of the following ...

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  • Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings

    Standard [CURRENT] 2021

    MSS SP-51:2021

    Class 150LW Corrosion Resistant Flanges and Cast Flanged Fittings

    This Standard Practice specifies a series of cast austenitic stainless-steel flanged fittings and austenitic stainless-steel flanges of reduced weight with mating dimensions for assembly with ASME ...

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  • Valve User Guide

    Standard [CURRENT] 2021

    MSS SP-92:2021

    Valve User Guide

    This Guide presents information which should be helpful to users desiring to avoid the most obvious causes of problems with valves. The material is divided into five main sections: "References" ...

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

    Standard [CURRENT] 2021

    MSS SP-53:2021

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

    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 ...

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  • Diaphragm Valves

    Standard [CURRENT] 2021

    MSS SP-88:2021

    Diaphragm Valves

    This Standard Practice applies to valves for general liquid and gas service that effect valve closure by means of a resilient diaphragm sealing against a weir or a diaphragm acting in conjunction ...

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  • Recommended Rules and Guidelines for SI (Metric) Data in MSS Standards

    Standard [CURRENT] 2021

    MSS SP-86:2021

    Recommended Rules and Guidelines for SI (Metric) Data in MSS Standards

    This Standard Practice provides recommended rules and guidelines for determining SI (metric) units and numbers, when necessitated, for use in bi-dimensioned new or revised MSS standards, or in the ...

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