Safety Integrity Level VERification - ISA 2001

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One of the activities that should be performed according to the international functional safety standards is the SIL verification for a Safety Instrumented Systems. The first step in such a SIL verification or reliability analysis is the selection of a reliability analysis technique. Secondly input data should be gathered. These first two steps can be major hurdles to be taken. This calls for automated tools that can easily perform these reliability analyses. Furthermore the results of a reliability analysis should not only express the PFDavg value of a specific Safety Instrumented Function, but also focus on availability numbers, as end users often also require these numbers. In addition to the PFDavg value from which a Safety Integrity Level is derived, there are also requirements based on the architectural constraints concept that need to be considered. Along with other issues like variable proof test intervals for different parts of the Safety Instrumented Function there is a need for automated tools that can help during a SIL verification assessment.

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