Functional Safety 2016

Slide 10

InstMC FS2016 V1.3

Nicol Instrument Engineering Limited

Clarifies on



Risk reduction >10,000 or average frequency of

dangerous failure <10-8 per hour.

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Reconsider risk parameters - can they be modified?

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If multiple layers (e.g., SIS or BPCS) use lower risk

reduction per layer.

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use a quantitative methodology to confirm that the safety

integrity requirements are achieved, and take into

consideration dependency and common cause between

layers.