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Modern chemical plants including petroleum refinery and gas industries have evolved into more complex and specialized. In these industrial complexes, it is important to maintain acceptable safety level protecting from various potential disasters caused by fire, explosion and the leakage of toxic materials. Recently possibility and consequence of accidents are increasing in the industrial process. So there is a trade-off between the plant operation efficiency and safety level. In this study SIF(Safety instrument Functions) was incorporated into SIL(Safety Integrity Levels). As a result, the safety level was upgraded by designing resonable allocation of safety instruments.

A Study of Risk Reduction by SIL(Safety Integrity Level) Determination