Mistakes to avoid
Evaluation of the required SIL level of Safety Instrumented Functions (SIF) – SIL level allocation
Practical sheet REF: FIC0542 V1
Mistakes to avoid
Evaluation of the required SIL level of Safety Instrumented Functions (SIF) – SIL level allocation

Author : Olivier IDDIR

Publication date: July 10, 2014, Review date: November 14, 2016 | Lire en français

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5. Mistakes to avoid

5.1 Don't forget to add up the probabilities of scenarios involving the same RIS.

When several accident scenarios are going to call upon the same RIS (and are of the same severity), forgetting to cumulate their probabilities to deduce the level of SIL required for the RIS will result in an underestimation of the required SIL, which would lead to a risk reduction factor insufficient to guarantee an acceptable risk.

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