Hazard and Operability (HAZOP) analysis is a systematic procedure for determining the abnormal causes of process deviations from normal behavior and their adverse consequences in a chemical plant. A computer-aided HAZOP analysis software platform based on Signed Directed Graph (SDG) called SDG-HAZOP has been developed recently. While HAZOP analysis is generally applied only to continuous process plants, it can be generalized to include batch process systems as well, as shown in this paper. The main thrust of this paper, however, is to propose an efficient methodology utilizing SDG for the HAZOP analysis in batch process. This approach has been applied to an industrial case. The results show that it is more accurate and more comprehensive when compared with the conventional methods.
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