Calculation of time and team composition for thermochemical detectors calibration installed around open refinery plants

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.

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

Samarin

Kryuchkov

Strogonov

2022

Požarovzryvobezopasnostʹ

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The calculation of the regulated number of remote sensors of gas analyzers surrounding rectangular outdoor facilities at oil refineries

Samarin

Kryuchkov

Strogonov

2022

Požarovzryvobezopasnostʹ

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Introduction. The authors emphasize the importance of pre-explosive concentration sensors, that ensure the required fire safety (FS) at fire/explosion hazardous facilities of oil refineries. The authors substantiate the importance of maintenance procedures for first-level alarming devices that are part of automated process control systems (APCS) installed around outdoor facilities of refineries.Theoretical fundamentals. The authors argue that two counter-running subprocesses (destructive and creative (restorative)), that ensure fire safety, can describe a decrease in the efficiency of APCS subsystems in the FS monitoring, as well as their restoration at refinery facilities. The proper maintenance of gas detectors is presented as a discrete creative subprocess. The authors demonstrate a relation between the spatial location of sensors of stationary gas analyzers and the computability of their number, depending on the outdoor facility perimeter.Research results. To mathematically describe the maintenance procedure applied to stationary gas analyzers, the authors assess the dependence between the number of remote detectors, the perimeter of the rectangular outdoor unit, around which they are installed at a refinery, and the prescribed distance between the sensors.Conclusion. This assessment conveys the features of installation of gas detectors of any type depending on their classification based on physical methods of analysis. A conclusion is drawn that the perimeter data can help to calculate the number of rows for the installation of devices, the length of each row, the prescribed number of gas detectors in each row.

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Calculation of time and team composition for thermochemical detectors calibration installed around open refinery plants

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

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

The calculation of the regulated number of remote sensors of gas analyzers surrounding rectangular outdoor facilities at oil refineries

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