Switching Markov chains for a holistic modeling of SIS unavailability

Walid Mechri (1) , Christophe Simon (2) , Kamel Ben Othman (3)

1 LARA Tunis
2 CRAN - Centre de Recherche en Automatique de Nancy
3 ENIT - Ecole Nationale d'Ingénieurs de Tunis

This paper proposes a holistic approach to model the Safety Instrumented Systems (SIS). The model is based on Switching Markov Chain and integrates several parameters like Common Cause Failure, Imperfect Proof testing, partial proof testing, etc. The basic concepts of Switching Markov Chain applied to reliability analysis are introduced and a model to compute the unavailability for a case study is presented. The proposed Switching Markov Chain allows us to assess the effect of each parameter on the SIS performance. The proposed method ensures the relevance of the results.

Mots clés: Safety systems; Probability of failure on demand; Proof test; Common cause failure; Diagnostic coverage; Markov chains

Domaines: Automatique / Robotique

Walid Mechri, Christophe Simon, Kamel Ben Othman. Switching Markov chains for a holistic modeling of SIS unavailability. Reliability Engineering and System Safety, 2015, 133, pp.212-222. ⟨10.1016/j.ress.2014.09.005⟩. ⟨hal-01071409⟩