Functional Safety 2014

Standards employed

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API RP 14C implemented for Process Shutdown

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PSS system of 300-350 SIFs, over 1000 I/O

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Shutdowns are not prioritised; all treated the same

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SIL reviews conducted on a number of projects tell us only 10-15% of

these shutdowns are for personnel safety

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Fire and Gas and ESD systems are larger still, with up to 1500 I/O

The management of software integrity over such large safety systems

presents challenges, the same challenges as for IEC61511 designs, but

on a larger scale.

Neil Wakeling, August 2014