An approach to modeling the maintenance of stationary thermochemical gas analyzers at an oil refinery

Introduction. The authors draw attention to the importance of the pre-explosive concentration detectors to assure the fire safety (FS) of fire and explosion hazardous facilities at oil refineries. The problem of the principle of pla­cing detectors close to sources of potential leaks is identified. The subject of research is the process of the maintenance of stationary thermochemical gas analyzers and their detectors installed around open-air facilities (OAF). Theoretical fundamentals. The notion of the discipline of the maintenance of stationary thermochemical gas analyzers is addressed in this section. The authors justify the choice of this type of devices according to the classification based on physical methods of analysis. Maintenance as a process, focused on the fire and explosion safety at oil refineries, depends on environmental and meteorological parameters, as well as the parameters of the process equipment. The release of catalytic poisons in the process of oil refining at OAFs, which negatively affect the sensitive elements (SE) of thermochemical detectors, and weather conditions may reduce calibration adjustment intervals or cause an accelerated failure of sensitive elements. The impact of environmental factors makes it necessary to adjust the detector calibration dates with account taken of the standard ones specified in the engineering documentation. Research results. The work sets the goals in terms of the values of the function of groups of parameters that substantiate the implementation of measures focused on the maintenance of detectors in the condition required by the documentation. The maintenance evaluation criterion is expressed as a vector of objective functions that convey the dependencies between groups of climatic, personnel work performance, specific, and other parameters. The integral criterion of the maintenance efficiency is provided in the form of a rectangular matrix and a convolution that takes into account three vectors of objective functions. The discipline of the maintenance of gas analyzers is presented in the form of a discrete subprocess of the process of fire and explosion safety assurance. Conclusions. This research work addresses an approach to modeling the discipline of the maintenance of stationary thermochemical gas analyzers installed around the open-air facilities (OAF) of an oil refinery. In further studies it is necessary to analyze the spatial location of the gas analyzer detectors to determine their number depending on the perimeter of the oil refinery's open-air facilities.