This paper presents the methods of detection and diagnosis of failures, that is, detectingthe existence and causes of failure that can be applied in systems that operate in realtime. The proposed system allows automatic and semi-automatic security management,and provides general average or minimizes the consequences of disasters. In addition, itdefines the conditions, i.e. the intervals of parameter values, under which causes of failureare created. Based on these parameters, optimal design of protection is possible and itenables the efficient management of the system.Suggested fi re safety system in the process of atmospheric rectification of oil offers thepossibility to choose an optimal diagnostic algorithm and its practical and economic usage.A new approach should be applied in order to reduce fire hazards in the process ofatmospheric rectification of oil. Fire safety system should be inseparable from thetechnological process, and vise versa.The procedure recommended for fault detection and diagnosis consists of two phases.The first phase involves the assessment of the process state, while the second involves theidentification of the values of processing parameters and their correlation with the processmodel parameters.
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