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Provides one possible technique for calculating PFDavg values for Safety Instrumented Functions (SIF) installed in accordance with ANSI/ISA-84.01-1996. Presents the engineer(s) performing design for a SIF with a relatively simple technique generally following the simplified equation approach for assessing the capability of the designed SIF. Offers the engineer steps to follow in estimating a mathematical value for PFDavg for typical configurations of SIF designed according to ANSI/ISA-84.01-1996. Does not cover modeling of external communication or operator interfaces. ISA-TR84.00.02, Parts 1-5, is intended to be used with a thorough understanding of ANSI/ISA-84.01-1996.
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