Abstract
Abstract An important feature of the industrial non-routine operation processes is the time sequence constraint among its steps. Therefore, the main hazard source could be the risk originating from the out-of-sequence scenarios. The traditional job safety analysis (JSA) method does not take account of time sequence constraint and should be adapted to address this problem. A graphical model based on Petri net is defined and further integrated into JSA. A non-routine operation process can be divided into steps according to JSA and then be represented as the basic unit of the revised Petri net. Through the graphical model, abnormal time sequence scenarios and their corresponding abnormal events can be identified. The united method can address time sequence and provide an intuitive and logical risk assessment procedures. The results can also provide effective guidance for workers and supervisors in the non-routine operations process.
Published Version
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