1. What is a risk graph?
1.1 The principle
The risk graph is used to define the required SIL level based on the evaluation of four parameters:
the impact of the risk on personnel or the environment (C) ;
frequency of exposure to risk (F) ;
the possibility of avoiding the hazard (P);
the probability of hazard occurrence (W).
The "Calibration examples" table shows assessment criteria for the four parameters (C, F, P and W). These criteria are closely based on those presented in IEC 61508-5.
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What is a risk graph?
What is the criticality matrix?
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