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5. Common causes of failure
5.1 Preamble
Certain types of KooN redundancy can reduce the probability of RIS failure. On the other hand, it is necessary to take into account the possibility that certain causes may lead to the simultaneous failure of redundant equipment.
ISO 12489 introduces the notion of common cause of failure by pointing out that, while mathematically it is possible to consider that the probability of failure of "N" similar pieces of equipment with 1ooN redundancy is "p N " (p being the probability of failure of a piece of equipment), in practice it is not possible to "indefinitely" reduce the probability of failure of a system simply by increasing the number of redundant pieces of equipment. To illustrate this, the standard...
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Common causes of failure
Method for assessing the probability of failure of a RIS
Bibliography
Bibliography
Standards and norms
- Analysis techniques for dependability – Reliability diagram block and Boolean methods - IEC 61078 - Août 2006
- Sécurité fonctionnelle des systèmes électriques/électroniques/électroniques programmables relatifs à la sécurité - IEC 61508 - Avril 2010
- Analyse par arbre de panne - IEC 61025 - Décembre 2006
- Functional safety – Safety instrumented systems for process manufacturing - IEC 61511-1 - Février...
Organizations
French National Institute for Industrial Environment and Risks (INERIS) http://www.ineris.fr
Instrumentation Society of America (ISA) https://www.isa.org/http://www.isa-france.org
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