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Modélisation des systèmes instrumentés de sécurité

Abstract : Safety Instrumented Systems (SIS) have to be assessed in order to determine the probability of dangerous failure. These SIS are important safety devices in high-risk level process industries and need to be highly reliable. Preventive maintenance and periodic tests are tools for maintaining such SIS at a low probability of failure. The assessment of SIS incorporates modelling and calculation. The research identifies modelling topics and the limits of the mathematical methods used. We have analysed the influence of test coverage and repair capability to calculate the probability of dangerous failure. We have shown that models based on Markov graphs can only be used if confusion is avoided between the repair time and the interval between periodic tests. We have also demonstrated that the reliability and safety of a redundant system constituted of two detectors, two programmable logic controllers (PLC) and two actuators depend on the desynchronisation of periodic tests for each channel. The optimisation of safety levels is a function of the interval between tests and the desynchronisation between periodic tests. INERIS carries out research in partnership with industry (manufacturers and users) and develops assessment of dynamic reliability. The aim is to define methods for analysing complex systems composed of sensor networks, communication field bus and PLC.
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  • HAL Id : ineris-01869089, version 1

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Dominique Charpentier, Jean-Michel Dranguet. Modélisation des systèmes instrumentés de sécurité. Rapport Scientifique INERIS, 2007, 2006-2007, pp.56-57. ⟨ineris-01869089⟩

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