An Optimization Approach for Safety Instrumented System Design
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An optimization approach for Safety Instrumented System (SIS) design minimizing structure-dependant Life-Cycle Costs (LCC) is presented in this paper. It provides a systematic procedure to determine the most cost efficient SIS configuration for an equal degree of functional safety. The approach determines the optimal SIS architectures for sensor and final element subsystems, the optimal component sets (including heterogeneous redundancies), and the optimal distribution of Probability of Failure on Demand (PFD) among the subsystems. Downtime costs caused by proof tests and spurious trips of SIS are considered.
Keywords: RAMS 2011 Proceedings - Systems Engineering - Design Reliability