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About This Item

 

Full Description

1. SCOPE

1.1 This 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.

1.2 These specified markings serve to identify the manufacturer, the rating designation, materials of construction and special service limitations imposed by the manufacturer. They are used for product identification and to assist in proper application.
 

Document History

  1. MSS SP-25-2018


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

    • Most Recent
  2. MSS SP-25-2013


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

    • Historical Version
  3. MSS SP-25-2008

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    viewing


    Standard Marking System for Valves, Fittings, Flanges and Unions

    • Historical Version
  4. MSS SP-25-1998


    Standard Marking System for Valves, Fittings, Flanges and Unions

    • Historical Version