State-Based Modelling in Hazard Identification
The signed directed graph (SDG) is the most commonly used type of model for automated hazard identification in chemical plants. Although SDG models are efficient in simulating the plant, they have some weaknesses, which are discussed here in relation to typical process industry examples. Ways to tackle these problems are suggested, and the view is taken that a state-based formalism is needed, to take account of the discrete components in the system, their connection together, and their behaviour over time. A strong representation for operations and actions is also needed, to make the models appropriate for modelling batch processes.
KeywordsModel-Based Reasoning Qualitative Modelling Simulation
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- 1.S.A. McCoy, S.J. Wakeman, F.D. Larkin, M.L. Jefferson, P.W.H. Chung, A.G. Rushton, F.P. Lees, and P.M. Heino. HAZID, a computer aid for hazard identification. Trans IChemE, Part B (Process Safety and Environmental Protection), 77:317–353, November 1999. (Papers 1 to 3 in a series of 5).Google Scholar
- 2.S.A. McCoy, S.J. Wakeman, F.D. Larkin, P.W.H. Chung, A.G. Rushton, and F.P. Lees. HAZID, a computer aid for hazard identification. Trans IChemE, Part B (Process Safety and Environmental Protection), 78:91–142, March 2000. (Papers 4 and 5 in a series of 5).Google Scholar