Guideline for follow-up of Safety Instrumented Systems (SIS) in the operating phase

This guideline describes a best practise for follow-up of safety instrumented systems (SIS) during operation of a process facility. It covers management of functional safety, operation, maintenance, monitoring, and management of change. Methods for updating failure rates and optimising test intervals are presented.

The document is an update of SINTEFs SIS follow-up guideline published in 2008 and 2021