An article authored by exida's Steve Gandy entitled: Conforming to IEC 6511: Operations and Maintenance Requirements has been published in the Safety-Critical Systems Club newsletter.
It is hard to believe that the IEC 61511 standard has been in existence since 2003 and most companies operating in the process, chemical, and refining industries have adopted its practices. It is also significant that any plants with a Safety Instrumented System (SIS) will now be halfway through their useful life. It therefore seems opportune to ask how well companies have been recording the performance of their SISs, interims of failure, spurious trips, time to repair/restore, and proof testing results.