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This paper discusses the variations in inspection results which can be obtained through the use of mixing variables within the allowable specification requirements. The need to standardize field indicators also is discussed. The ability to reproduce inspections, for example, during audits, without more rigid standardization is questioned. The base specification for the above discussion will be Military Standard on Nondestructive Testing Requirements for Metals (MIL-STD 271, D and E). Also, a brief dissertation concerning the lack of magnetic particle/liquid penetrant testing requirements as applied to commercial shipbuilding is given. Finally, the paper discusses magnetic particle/liquid penetrant acceptance standards and the lack of statistical or engineering data, or both, to support their existence.
nondestructive tests, standards, magnetic particle tests, penetrants, shipbuilding
Newport News Shipbuilding and Drydock Co., Newport News, Va.