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Hybrid applications of IEC61511 – Laurie Blackmore
Assessment methods:
(1)
True cost benefit analysis - Need to know cost of SIL
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Cost of SIL1 can vary by a factor of more than 100 !
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Cost increase of SIL1 to SIL2 could be minimal (not x 10)
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Cost increase of SIL1 to SIL3 could be only a factor of 2 (not x 100)
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IEC OOM approach not suitable – use alternative analysis for true cost/benefit
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Asset Assessment Issues