Integration of mathematical modelling and HAZOP study to quantify the consequences of the impact of deviations on the state parameters of hazard sources

The HAZOP procedure is a common brainstorming method used to identify deviations in the operation of potentially hazardous equipment, their causes and consequences. As a result of the HAZOP session, the possibility of an emergency depressurization of the equipment can be es-tablished. Despite the thoroughness and consistency of the HAZOP study, it is still a common practice to qualitatively assess the impact of deviations on subsequent processes in emergency equipment. This approach is the main reason for the high probability of errors, especially when studying complex technological systems. Modern research focuses on the fact that it is the combination of the quantitative approach and HAZOP that makes it possible to increase the ac-curacy of the expert opinion and to determine the further use of the information obtained to as-sess the potential consequences of emergency depressurization. For the HAZOP study of com-plex chemical and technological systems, there is a tendency to increasingly usage of dynamic modeling to identify numerical indicators of the impact of deviations in process parameters on the state of the emergency apparatus. However, there is a lack of a common methodological framework for the use of such models in the HAZOP session, which is due to the complexity of organizing the HAZOP session and the lack of influence of practical aspects of the real work of the expert group (HAZOP participants) on the integration of modeling into the HAZOP process. Based on the formalized model of information flows of a HAZOP study, the optimal place and procedure for applying the mathematical model of the emergency apparatus were determined. The developed block diagram of the HAZOP study algorithm with the integration of mathemat-ical modeling of the impact of deviations on the parameters of the hazard source provides both a quantitative and qualitative approach to HAZOP study, depending on the expert's decision.