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Title: Nondestructive Evaluation Of Engine And Compressor Components
Author: David L. Culbertson
Source: American Gas Association 1979
Year Published: 1979
Abstract: It hasnt been that long ago since mass produced parts for power engines, such as gears, valves, and piston pins, were just merely spot checked or examined. This was called sampling and was quite acceptable provided the risk for reliability was known. For example, if out of 1,000 parts only 30 of them were examined, this could lead to a 50 percent chance of accepting a lot of parts in which 20 perceni of the parts were defective, the wrong side, the wrong hardness, and etc. These odds may be acceptable to some, but if they are not, then how many samplings would be required to get belter results?

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