A Graphical Approach for Representing Hazard Scenarios

Rafael Batres, Department of Production Systems Engineering, Toyohashi University of Technology, Hibarigaoka 1-1 Tempakucho Toyohashi 441-8580, Toyohashi, Japan, Tetsuo Fuchino, Department of Chemical Engineering, Tokyo Institute of Technology, 2-12-1 Oookayama Meguro-ku Tokyo 152-8552, Tokyo, Japan, and Yukiyasu Shimada, Chemical Safety Research Group, National Institute of Occupational Safety and Health, 1-4-6 Umezono Kiyose Tokyo 204-0024, Tokyo, Japan.


This paper describes “hazard scenario graph” or HSG which is a visual representation technique for performing hazard identification. HSGs explicitly represent all the intermediate and final consequences in the scenario. HSG is based on ontologies and knowledge representation techniques with which knowledge extraction is possible. The method explicitly represents causality, substances, equipment, physical and chemical transformations, plant operations and personnel, facilitating the integration with other engineering tools such as CAD systems.