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Hybrid applications of IEC61511 – Laurie Blackmore
A common feature of all these hybrid schemes:
SIS is larger and more complex than an IEC61511 design based
on SIF‘s at SIL1+
For a typical offshore production facility:
Scheme 1 & 2 – Maybe 10% bigger than just API and
maybe 3 to 4 times bigger than IEC61511
Scheme 3 – Maybe 30% bigger than just API and
maybe 4 to 5 times bigger than IEC61511
There is a similar effect on an IEC61511 implementation if asset protection
is included in the SIS – it becomes a hybrid
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Size and Complexity