6. Our advice
6.1 Prefer to show a barrier in its entirety, rather than presenting its component parts separately.
In the case presented below, we consider on the one hand the dreaded event Gas leak on a pipeline with a frequency of occurrence of 10 - 2 /year, and on the other hand a Safety Instrumented System (SIS) composed of :
a gas detector with a PFD equal to 10 - 1 /sollicitation;
a treatment plant with a PFD equal to 10 - 2 /sollicitation;
an automatic isolation valve with a PFD equal to 10 - 1 ...
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Bibliography
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Bibliography
Yves Mortureux — Fault, cause and event trees — SE 4050
Yves Mortureux — Dependability: risk management methods — BM 5008
Olivier Iddie — The bow tie: a method for quantifying major risk — SE 4055
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