MSS SP-55-2025

Current Revision
Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components–Visual Method for Evaluation of Surface Irregularities

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This Standard Practice is intended to supplement requirements of the ASTM Standard Specifications identified in Section 2, by providing a collection of reference photographs typical of the various surface irregularities common to iron and steel pressure castings, which illustrate generally acceptable and generally rejectable quality.

Table 1 of Section 7 is provided to show MSS interpretation as to the relationship between this Standard Practice and the levels of surface quality illustrated by the comparators and the associated photographs of the Castings Technology International (CTI), “Comparators for the Definition of Surface Quality of Steel Castings”. SP-55 continues to be maintained under the consensus of MSS Technical Committee 304, Quality Standards.
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