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Hybrid applications of IEC61511 – Laurie Blackmore
API RP14C is the regulatory design basis BUT the Operator has decided to pre-specify
intregrity levels without SIL assessment. Benefits include:
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Establish level of risk for each hazard
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Specify performance requirements
related to level of risk
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Design is based on SIL requirements
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Fault tolerance
where needed
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Personnel competencies
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Address software issues
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Address systematic issues
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More formalised validation
§
Prioritise testing resources
§
The manhours and potential schedule implications are reduced since only SIL
validation is required
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API design but with pre-specified integrity levels for safety functions