Compressed project schedules, limited staff accessibility and engineering cost procedures drive the need to integrate HAZOP and SIL/LOPA studies. Furthermore, the IEC 61511 promotes the benefits of a tight relationship between the two.
LOPA compares the risk of a process without safeguards to that with safeguards. The delta Risk is evaluated using tools (matrices) based on “ALARP” to suggest how much mitigation (quantified using IPLs and SILs) is required.
