Evaluation of the required SIL level of Safety Instrumented Functions (SIF) – SIL level allocation : What is the LOPA method?

What is the LOPA method?
Evaluation of the required SIL level of Safety Instrumented Functions (SIF) – SIL level allocation

Author : Olivier IDDIR

Review date: November 14, 2016 | Lire en français

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3. What is the LOPA method?

3.1 Principle

Applying the LOPA method (see LOPA method for hazard studies [FIC 0538] ) to define the required SIL is similar to using the criticality matrix.

The first step is to assess the criticality of the scenario (i.e. to evaluate its probability and severity) without considering the existence of the RIS whose required SIL is to be evaluated. To do this, the analysis can be carried out using the table proposed in standard IEC6 1511-3 (see Analysis table for implementing...

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What is the LOPA method?