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.
–
Reconsider risk parameters - can they be modified?
–
If multiple layers (e.g., SIS or BPCS) use lower risk
reduction per layer.
–
use a quantitative methodology to confirm that the safety
integrity requirements are achieved, and take into
consideration dependency and common cause between
layers.