Study on safety capacity and layout of chemical industrial park based on overall regional risk analysis

As chemical industry parks developed fast in recent decades, the risks of chemical plants had been increased dramatically and major accidents had taken place frequently. In order to implement inherent safety, avoid and reduce accidents loss, the concept of safety capacity of chemical industry park was proposed. At the same time, suitable layout design was used to prevent the domino effect and decrease the overall regional risk. In the present paper, the definition of safety capacity was studied. Based on risk capacity calculation model which used individual risk, societal risk and potential loss of life as indicators, influence factors of safety capacity (such as safety management, safety technique and emergency system) were took into consideration and an adaptable safety capacity calculation model was constructed. The new calculation model was applied to evaluate both overall and existing safety capacity of a partially completed chemical industry park and predict the scales of chemical plants which may settle down in the future. On this basis, for the purpose of preventing major accidents and external domino effect accidents, regional risks of different layout design options were analyzed and the best suitable layout design was determined. The paper proposed a new safety capacity calculation model and a case study was presented to illustrate the applicability of this methodology in planning and layout design of the chemical industrial park.