The hazard and operability (HAZOP)analysis information consists of content information and structure information.A scenario object model (SOM)based on ontology was proposed

which could be used to represent contents and structures of hazard evaluation information.It could solve the problems including information hidden and information loss

existing in traditional HAZOP methods.Computer-aided automatic hazard evaluation and transfer

auditing and sharing of safety information were realized on graphical SOM.According to industrial practice

graphical SOM could lay the foundation for the standardization of hazard information

and be helpful to achieve high quality and efficiency of process hazard analysis.