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Norway to the Rescue!
17
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OLF-070 Guideline
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“Unconventional” IEC61508 tertiary guidance
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Semi prescriptive approach
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Standard SIFs identified, SILs allocated
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SIL allocated per what should be
achievable
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Implement per SIF architecture
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Achieve PFD
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Assumes ISO 10418 / API 14C
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Non standard SIFs per 61511
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SIL targeting process reduces