Control Engineering

Process Safety What are the Odds?
Within process plants, layers of protection (LOP) include relief valves, rupture disks, dikes, and a safety-instrumented system (SIS). SISs are specially engineered solutions that are continuously online and expected to instantaneously take action to mitigate any detected unsafe process events. But with weeks, months, or even years between unsafe events, what can be done to minimize the probabi...