Novel Methodology for Inherent Safety Assessment in the Process Design Stage

Hazards are intrinsic to a material or its conditions of storage or use [Hendershot, D. C. Inherently safer chemical process design. J. Loss Prev. Process Ind. 1997, 10 (3), 151−157]. Inherently safer designs aim to avoid hazards by design, rather than by add-on measures. The importance of inherent safety has been increasingly stressed in chemical process industries in recent years. It is the most suitable safety approach, particularly in the process design stage. This paper describes a new comprehensive inherent safety index (CISI) for use in the early process design stage. The CISI assigns equipment safety scores to individual units in the process based on chemical, process, and connectivity scores. The chemical score considers the weighted severity score of each chemical in the unit as well as the reactivity score. The reactivity score is calculated separately for the mixture of chemicals in each unit. Since hazards can be compounded by the existence of highly interconnected units, the concept of the c...

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