The standard is a critical quality specification used in the valve, flange, and fitting industry. Developed by the Manufacturers Standardization Society (MSS) of the Valve and Fittings Industry, this standard establishes a visual and tactile methodology for evaluating surface irregularities on steel castings.
The is a copyrighted publication. You cannot: mss sp55 standard pdf work
The most frequent error in is relying on a scanned copy from 1990. MSS standards are regularly reaffirmed. Always check the copyright page of your PDF. If it is older than 10 years, cross-reference with the MSS website. The standard is a critical quality specification used