Mss Sp-55 - Standard Pdf

"The 2011 edition is obsolete." Fact: As of 2024-2025, MSS SP-55-2011 (reaffirmed 2017) is the active edition. MSS has not published a 2020 or 2024 revision.

| Standard | Relationship | | --- | --- | | | Radiographic & visual standard. Use SP-54 for internal soundness, SP-55 for surface only. | | ASME B16.34 | Mentions SP-55 for valve casting quality. | | ASTM A802 | Similar standard for steel castings surface acceptance, but less valve-specific. | | ISO 11971 | International version (visual of steel castings). Not identical to SP-55. | | NADCAP AC7114 | For aerospace castings; references SP-55 style criteria. | mss sp-55 standard pdf

This comprehensive article covers the history, scope, acceptance criteria, and practical application of MSS SP-55, while guiding you on how to access the official document. MSS SP-55 stands for the Manufacturers Standardization Society of the Valve and Fittings Industry Standard Practice 55 . Its full title is: "Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components – Visual Method for Evaluation of Surface Irregularities." "The 2011 edition is obsolete