Functional Safety 2016

SRS for an inhibit SIF

• Local opening of SDVs must not be possible

• Bypasses – ideally prohibit. But consider if circumstances when a bypass is

needed, and design logic accordingly (e.g. when the line is required to be used

for other purposes)

• Design of DP across valve - particular issue of plugging in pigged lines.

Importance of trace heating. Ensure realistic reliability data used for line prone

to plugging.

• Recommend to develop a standard SRS format specific to your applications.