TAKING THE CONTROL SYSTEM FOR GRANTED - ENSURING THE INTEGRITY OF SUB-SIL INSTRUMENTED FUNCTIONS11

摘要

Most organisations are routinely claiming the maximum permitted contribution for non-safety (sub-SIL 1) Instrumented Functions during their SIL determination reviews. Similarly, claims for the reliability of the Basic Process Control System (BPCS) also impact on the calculation of safety requirements. Often these claims are made in terms of alarm system performance, operator response and control system availability. This paper will examine a cost-effective, qualitative methodology for demonstrating the risk reduction performance claim, both for new and legacy installations.