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PFDavg calculation based on minimal cut set with safety condition
Author(s)
Date Issued
January 1, 2017
Type
Conference Paper
Abstract
Average probability of dangerous failure on demand or PFDavg plays a pivotal role in reliability of SIS. However, in the previous studies, PFDavg verification for redundant schemes has a limitation to apply with conditional safety function and the studies result calculates the estimated PFDavg value that is not a practical value due to the error of conditional analysis. Hence, this research presents PFDavg calculation which complies with IEC 61508-6 and covers safety condition by using minimal cut set. Since this set is specified from realistic requirement of safety instrumented function, the proposed new method can be applied with various redundant architectures. In conclusion, this developed method provides the solution for the conditional safety function problems and gives more accuracy PFDavg value than the other methods.
Citation
Lecture Notes in Engineering and Computer Science, 1, 286-289, 2017