Abstract

This paper presents the results of three comparative studies. In each study the failure rate of one specific valve at one specific facility is estimated from field failure data (FFD). Each estimate is compared to the failure rate predicted for that valve by the Calibrated FMEDA™ technique. The predicted failure rates consider the failure rate variations due to valve application, to fluid service, and to each specific facility’s Site Safety Index (SSI) which accounts for various aspects of safety culture. The results show that the predictions are quite good, i.e., all predictions lie within a 70% confidence interval constructed from each valve’s FFD and near the estimated mean failure rate for each valve.

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