Hazardous process industry sites must carry out periodic functional safety assessment (FSA) of safety instrumented systems. But why?
Many hazardous process industry sites have viewed Functional Safety Assessment (FSA) as a project activity to be completed when a new safety instrumented system (SIS) gets installed, and of course, that is absolutely correct. Some have also registered that FSA is required for modifications, and a few have acknowledged that it must even be completed for minor changes to an SIS.
But what about existing, or "legacy" systems where apparently nothing is being changed and no SIS equipment is being modified? The system didn't fail last time it was needed, so surely it will be perfectly good next time?
My Father used to say this a lot. "There's no such thing as a free lunch". I never got the meaning as a child...all my lunches seemed to be free? Sadly, he passed away when I was in my teens, so I guess I never really understood the real meaning until later on in life.
Of course, I think I understand now. If you are offered anything for FREE then there is usually a "catch" of some sort. The catch might be an associated sales pitch, or a later charge for something you don't really want or need, but forgot to cancel because someone has your card details. I've been a victim of this myself, so would not inflict this approach on others.