Chapter VII

Safety Instrumentation Functions and System (Including Fire and Gas System)


Knowledge of safety instrumented systems (SISs) based on IEC 61508, discussed in the previous chapter, has been elaborated here for distinction among the terms SIS, safety instrument function (SIF), and safety integrity level (SIL), used interchangeably. Competency structure of SIS calls for a detailed discussion of reliability theory and relationship between the same and SIS. Bathtub curve and Weibull distributions are applied for SIS reliability calculations. There are various types of failure; random, systematic, and common cause failures in various instrumentation systems need special attention. Also, discussions on special requirements for sensors, ...

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