Determination of Sample Size in Service Inspection

[+] Author and Article Information
S. Qin, G. E. O. Widera

Department of Mechanical and Industrial Engineering, Marquette University, 1515 W. Wisconsin Avenue, Milwaukee, WI 53233

J. Pressure Vessel Technol 119(1), 57-60 (Feb 01, 1997) (4 pages) doi:10.1115/1.2842267 History: Received May 18, 1994; Revised March 26, 1996; Online February 11, 2008


When performing inservice inspection on a large volume of identical components, it becomes an almost impossible task to inspect all those in which defects may exist, even if their failure probabilities are known. As a result, an appropriate sample size needs to be determined when setting up an inspection program. In this paper, a probabilistic analysis method is employed to solve this problem. It is assumed that the characteristic data of components has a certain distribution which can be taken as known when the mean and standard deviations of serviceable and defective sets of components are estimated. The sample size can then be determined within an acceptable assigned error range. In this way, both false rejection and acceptance can be avoided with a high degree of confidence.

Copyright © 1997 by The American Society of Mechanical Engineers
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