Since the standard was first issued in 2003, PSM-covered operating sites have been working hard to get to the point where all SIS functions are kept up to date with SIL Verification, SRS per function, and the regular proof testing.  Edition 2 now requires that historical performance of implemented SIS systems be fed back into PHA processes to validate assumptions which has cascading effects into SIS Design/SRS and to field instrumentation.  This is a complex, multi-disciplined process to manage even if there are no major changes to an existing process between safety and operability re-validations.

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