July 2002

Misc

What is an SIF?

Edward M. Marsza, Contributing Editor One of the biggest problems in implementing safety instrumented systems (SISs) is poor definition of the safety instrumented function (SIF). More t..

Edward M. Marsza, Contributing Editor One of the biggest problems in implementing safety instrumented systems (SISs) is poor definition of the safety instrumented function (SIF). More than any other SIS design issue, this problem is costing refiners money with little or no payback in terms of increased safety. Often, defining SIFs is left to control systems engineers who have little concept of the actual hazards that their SIFs are designed to prevent. As a result, definitions of SIFs are almost universally too broad. This ends up costing a significant amount of money for two reasons. First, noncritical I/O is l

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