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Effect of uncertainty of reliability data of instrumentation on risk assessment and prediction in process plant applications

D’Emilia Giulio, Natale Emanuela

Diagnostyka

2019

Vol. 20, No. 1

73--79

Some aspects are discussed concerning the uncertainty causes in risk assessment techniques of industrial interest. Particular attention has been paid to the evaluation of the effect of uncertainty of reliability data of devices and instruments to be used in process plants on the evaluation of the occurrence frequency of the top event. The influence of measuring equipment, whose contribution to the whole uncertainty appears in some cases very important, has been analysed with reference to both operative and environmental aspects.

Drawing Conclusions About Reliability Of Power Systems From Small Number Of Statistical Data

Liberacki R.

Journal of Polish CIMAC

2009

Vol. 4, no 2

191-197

Gathering reliability data is quite difficult. Potential sources of such data are: reliability guides and handbooks, data collecting during operation of technical devices, expert judgments. Practice shows that very often the statistical sample we have to our disposal is small and non – homogenous. The goal of the author was to verify, if it is possible to draw out useful in practice conclusions about reliability of technical items from small statistical sample and how to do it. In the article two potential ways to deal with the problem of small reliability data sample have been presented. First way is based on using mathematical statistics methods, the second way uses the fuzzy sets theorem methods.