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Quality Standard for Steel Castings and Forgings for Valves, Flanges, Fittings, and Other Piping Components
Liquid Penetrant Examination Method

This MSS Standard Practice, SP-93, was originally adopted in 1982 for the purpose of providing a uniform method of Liquid Penetrant Examination. It was specifically developed for the valve/piping industry but may be used in any application where this type of examination is suitable.
This 2008 edition includes minor revisions and was reformatted to conform to MSS practices.
This Standard Practice provides methods and acceptance standards for liquid penetrant examination of steel castings and forgings for valves, flanges, fittings and other piping components. It is applicable to examination of repairs as well as to initial examination of castings and forgings.
The methods of Section 4 provide uniform procedures which will produce satisfactory and consistent results upon which the Acceptance Standards of Table 1 may be used.
This Standard Practice includes the examination of pressure containing castings and forgings.


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