October 2001

Special Report: Plant Safety and Reliability

Safety integrity level verification - A PFD average calculation is not enough

Architectural constraints must also be considered

The safety life cycle (SLC) is one of the fundamental concepts presented in ANSI/ISA 84.011 and IEC 615082 functional safety standards. The objective of the SLC is to optimize safety instrumented system (SIS) design by matching the design to the risk reduction requirements of the process. Both standards describe in detail the various SLC steps. The overall objective of the SLC can be summarized in three steps that are also illustrated in Fig. 1.         Fig. 1. Basic safety life cycle steps. Analyze t

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