Optimal design of Safety Instrumented Systems: a graph reliability approach
Résumé
A Safety Instrumented System (SIS) is designed for the purpose of mitigating a risk or bringing the process to a safe state in the case of a process failure. However, in the field there is a considerable lack of understanding how to apply the ANSI/ISA S84.01-1996 and IEC 61508 safety standards in order to design SIS to meet the required Safety Integrity Level (SIL). Since no existing study has analyzed the optimal design of SIS with undefined structure and components choice constraints, this paper presents an optimization approach using reliability graph and genetic algorithm to identify the choice of components and design configuration in a SIS. An example which illustrates the use of the proposed approach to achieve a SIL 1 under cost and components choice constraints is proposed.
Origine : Fichiers produits par l'(les) auteur(s)