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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Bibliography
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Bibliography
Olivier Iddir – Principle for assessing the probability of failure of risk control measures. [SE 4 057] - Safety and risk management (2009).
Olivier Iddir – The LOPA method: Principles. [SE 4 075] - Safety and risk management (2012).
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