The Manufactures Standardization Society (MSS) says that Standard Practice, SP-44-2010, Steel Pipeline Flanges, has been approved by the American National Standards Institute (ANSI) as an American National Standard (ANS). In addition, the newly approved ANSI/MSS SP-44-2010 (incl. 2011 Errata) version has been published.

MSS SP-44 has become widely employed in the valve and piping industries and referenced in other industry and ANSI-approved standards. The approval of SP-44 as an ANS gives the industry a “national standard" for NPS 12 to NPS 60 flanges for high-yield strength materials that were not covered by current national standards.

The first edition of MSS SP-44 was published in 1952. It was developed under MSS Committee 110 and is today utilized in many industrial sectors; including paper, chemical, petroleum production and transport, petrochemical, nuclear power, hydroelectric power and those enterprises involved with fossil fuel power flanged piping joints, including valve and fitting systems. This Standard Practice addresses pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing. SP-44 is already incorporated by reference into the Code of Federal Regulations and contains construction details not covered by other standards; including P/T ratings of products made of high-yield strength materials (for example, for users that have flanged joints, flanged valves, and flanged fittings).

The new ANSI-approved American National Standard version, ANSI/MSS SP-44-2010 (incl. 2011 Errata Sheet), is now available; noting its content is substantively consistent with the superseded 2010 MSS-only edition. The comments received during the ANSI ballot, and other new revisions, will be considered by MSS Committee 110 and its Task Force during the current (2015-2016) revision cycle. Note the TF is to include external participation from the user and governmental communities. The result will be one unified and revised ANSI/MSS Standard Practice that benefits the industry as a whole and provides a basis for common practice by manufacturers, users, and the general public.

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