Pozharovzryvobezopasnost/Fire and Explosion Safety最新文献

{"title":"Estimating the maximum size of explosive iron sulfide particles","authors":"N. Poletaev","doi":"10.22227/0869-7493.2022.31.03.5-11","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.03.5-11","url":null,"abstract":"Introduction. There are estimates of the maximum size dcr of explosive particles of the two types of sulfide ores. The estimates are based on a qualitative approach to the dispersion analysis of combustible ore specimens (Soundararajan, Amyotte & Pegg, 1996): 49 μm < dcr, PO < 63 μm for pyrrhotite (PO) and 85 μm < dcr, PY < 145 μm for pyrite (PY). The task was to refine these estimates using the quantitative method of the mentioned analysis, taking into account the lower explosive limit (LEL) of flame propagation in terms of ore suspensions. Experimental data processing method. Continuous functions F of particle size distribution d were constructed for the two polydisperse specimens of pyrrhotite (LELPO,1 = 475 g/m3 and LELPO,2 = 1,375 g/m3) and two polydisperse specimens of pyrite (LELPY,1 = 375 g/m3 and LELPY,2 = 500 g/m3). The obtained functions FPO,1(d), FPO,2(d), FPY,1(d) and FPY,2(d) were converted using Rosin – Rammler distributions, filling the gaps between the discrete data of the grain-size analysis of the specimens. dcr rating. The procedure for estimating dcr (Poletaev, 2014) was employed to find the values of dcr, PO and dcr, PY using the following equations: FPO,1(dcr, PO)/FPO,2(dcr, PO) = LELPO,2/LELPO,1 and FPY,1(dcr, PY)/FPY,2(dcr, PY) = LELPY,2/LELPY,1. The solutions were presented in the visual graphic format.Discussion of the results. Due to the low values of explosion parameters of pyrrhotite and pyrite in a 20‑liter chamber (maximum explosion pressure Pmax ≤ 350 kPa, index Kst ≤ 2 MPa ∙ m/s), the validity of classifying ores as explosive dusts was discussed. Low explosion values have proven that sulfur is the main fuel in the air suspension. The explosiveness of ores is proven empirically (Selle & Zehr, 1954) by estimating the combustion temperature, which exceeds 1,000 °С.Conclusions. The values of dcr for sulfide ores have been refined: for pyrrhotite, dcr = 40 μm; for pyrite dcr = 107 μm. In the air suspensions of ores, only sulfur is burnt out, which substantially reduces the explosiveness of ores.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125497591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Classification of hotels taking into account fire risks","authors":"V. Prisadkov, N. Konstantinova, S. Muslakova, A. Abashkin","doi":"10.22227/0869-7493.2022.31.03.75-83","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.03.75-83","url":null,"abstract":"Introduction. The current Russian Regulation on classification of hotels hardly takes into account their fire safety conditions. The system, adopted in the Regulation, provides for an expert scoring assessment of hotel parameters for their assignment to a certain category (star rating). The purpose of the article is to develop methods that allow determining the level of fire safety of hotels in points commensurate with the accepted rating system, for its further use in the course of assignment of appropriate categories to hotels. Theoretical fundamentals of scoring methods of assessment of fire safety of hotels. Three approaches to the calculation of «fire points» of hotels have been developed, based on the breakdown of hotels into classes and identification of the fire safety index of hotels within one class. The first scoring method is the Gretener method used for calculating the integral fire safety index. The first and third quartiles are identified for the hotel statistics. Hotels, whose index does not exceed the first quartile, belong to the subgroup featuring a high level of fire safety; those ranging from the first (inclusively) to the third quartile belong to the medium level. If the values of the fire hazard index of hotels are not smaller than the third quartile, they belong to the subgroup that has a low level of fire safety. The second method is based on the use of a «safety reserve» in terms of evacuation time. The third model of assessing the fire hazard of hotels includes the breakdown of hotels into groups, identification of the value of individual fire risk, ranking hotels by the fire risk that varies from the lowest to the highest.Results and their discussion. As for the classification of hotels, problems that accompany the consolidation of the physical approach to the fire hazard assessment with the expert method of scoring are solved by choosing the proportion between the points of the system and the «fire points» set by the adjustment coefficient. The fire points, assigned to the subgroups of hotels, are indicative and should be corrected within the framework of the proposed approach.Conclusions. The experimental application of the developed methods using the cases of real hotel facilities will allow choosing the optimal engineering method of taking into account the fire safety of hotels in the process of their classification.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114629889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving the safety of oil and gas facilities by improving flame retardants","authors":"E. Golovina, A. Kalach, O. Bezzaponnaya, A. S. Krutolapov, S. Sharapov","doi":"10.22227/0869-7493.2022.31.03.24-33","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.03.24-33","url":null,"abstract":"Introduction. One of the ways to reduce the fire hazard at industrial facilities is the application of intumescent coatings. It is known that intumescent compositions are multicomponent composite materials, whose effectiveness is due to complex chemical transformations of the components of the studied flame retardant exposed to high temperatures. In this regard, the problem of studying the physicochemical processes and thermophysical characteristics of flame retardant thermal expansion materials is in demand and relevant.The purpose of this article is to analyze the thermophysical properties of water- and acrylic compound-based intumescent flame retardants to improve the safety of oil and gas facilities.To accomplish this purpose, the following objectives were attained:studying acrylic dispersion-based intumescent flame retardant materials using methods of thermal analysis;analyzing aqueous dispersion-based intumescent flame retardant materials using methods of thermal analysis;making a comparative analysis of the thermo-oxidative degradation of the studied flame retardant materials.Methods. During the study, thermogravimetric analysis, differential thermogravimetric analysis, differential scanning calorimetry, and quadrupole mass spectrometry were chosen as the main methods.Results. As a result of the studies performed using methods of synchronous thermal analysis of water- and acrylic compound-based intumescent flame retardants, the similarity of ongoing physicochemical processes was identified, including the presence of four main stages of mass loss and a high exothermic effect. This high thermal effect has proven high flammability of the studied flame retardant materials.Conclusions. Following the analysis, the authors have concluded that intumescent flame retardants, containing acrylic vinyl acetate emulsion and aqueous dispersion, begin to lose their performance characteristics, necessary for a flame retardant material, when the temperature reaches approximately ~600 °C.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123770393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analyzing the fire performance of concrete columns and slabs under loading and using options, preventing explosive spalling to ensure the pre-set fire resistance","authors":"A. Garashchenko, S. Antonov, A. Danilov, V. Pavlov, N. Novikov","doi":"10.22227/0869-7493.2022.31.03.45-64","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.03.45-64","url":null,"abstract":"Introduction. The authors focus on preventing the explosive spalling of concrete and the fireproofing of reinforced concrete structures. The relevance of this issue is explained by the insufficient number of fire tests of such structures under loading and thermal engineering calculations, needed for an objective analysis of testing results.Goal and objectives. The authors analyze the results of a series of fire tests, involving concrete columns and slabs with and without polypropylene microfiber, if no fireproofing is applied, as well as the results of the same tests involving the same items fireproofed by plates or plaster.Methods. The fire resistance of full-scale specimens of concrete was evaluated according to a standardized testing in a fire furnace under loading. It encompasses additional thermocouple measurements used to make a thermal engineering analysis. The analysis entailed both one- and two-dimensional problem formulations, methods and programmes for the numerical computation of non-stationary temperature fields in fireproof structures.Results. New data, obtained in the course of the fire experiments, show the efficiency of the polypropylene microfiber used to prevent the explosive spalling of concrete. The fire resistance limit is R 120 and R 150 under constant static loading. The fire resistance limit of similar structures, fireproofed by PROSASK Firepanel plates or IGNIS LIGHT plaster, was demonstrated. The specimens show the efficiency of methods and programmes for the one- and two-dimensional numerical analysis of non-stationary temperature fields in fireproof structures. The calculation results are presented for various fireproofing options.Conclusions. The testing results and their thermal analysis represent important items of information necessary to ensure the fire safety and the pre-set fire resistance of concrete structures under loading. They can also be used to outline the development pattern of this experimental and theoretical research project. The efficiency of thermal engineering calculations as a tool for evaluating fire protection parameters and the fire resistance of concrete structures is demonstrated, also as an option to reduce the number of expensive fire tests.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125916851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analyzing the influence of the fire resistance of building structures on human safety in case of a fire","authors":"A. Pekhotikov, R. A. Ivashchuk, A. Gomozov, S. A. Luchkin","doi":"10.22227/0869-7493.2022.31.03.84-95","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.03.84-95","url":null,"abstract":"Introduction. Methodological provisions must be developed to evaluate the impact of the fire resistance factor of building structures on human safety during evacuation and rescue with account taken of the composition andfunctional characteristics of other fire safety systems to formulate modern regulatory requirements for the fire resistance of building structures under fire conditions, develop science-based solutions for the fire safety of buildings and structures in case of forced deviations from the fire resistance requirements set in regulatory documents, and justify the construction of buildings and structures, based on modern structural systems, having non-standard fire resistance limits, etc.The purpose of the article is to develop general methodological provisions and mathematical relationships that allow evaluating the impact of the fire resistance limits of building structures both on safe evacuation and safe rescue from buildings.Methods. Analytical and mathematical methods are used to evaluate the combined effect of changes in the fire hazard arising along the evacuation routes, in a room with a person waiting to be rescued by fire departments, as well as along the routes taken by fire departments carrying this person out, in combination with the evaluated time span needed for the structure to lose its fire resistance. The value of this time span is used to identify the time available for the safe evacuation and rescue of people.Results. Theoretical provisions have been developed to take into account the influence of the fire resistance factor of building constructions on the safety of people in a building in case of a fire.Conclusions. The research findings were contributed to the general methodological provisions and mathematical relationships needed to determine the quantitative relationships between the extent of fire resistance of a building, fire resistance limits of building structures, the time of arrival of fire departments, types of fire alarm and evacuation control systems, and the possibility of safe evacuation and rescue of people from a building.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129865488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical simulation of inert heating and pyrolysis of forest fuel under the influence of a forest fire front, if the process of sooting is taken into account","authors":"N. Baranovskiy, V. A. Vyatkina","doi":"10.22227/0869-7493.2022.31.03.34-44","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.03.34-44","url":null,"abstract":"Introduction. Large amounts of pollutants, including carbonaceous particles of soot, are released into the atmosphere during a forest fire. High concentrations of these particles in the air can lead to the development of cardiorespiratory diseases or death. It has been noticed that a certain number of soot particles is produced at the stage of forest fuel pyrolysis. In this regard, it is advisable to study the processes of pyrolysis and sooting to develop effective methods of their prediction and prevention.Goal of the study. The goal of this study is the mathematical simulation of heat transfer in an element of standard forest fuel (a birch leaf), taking into account the thermal decomposition of dry organic matter and sooting.Materials and methods. Within the framework of the work, scenario modeling of heat and mass transfer processes in an element of forest fuel (a birch leaf), subjected to the influence of a high-temperature environment, was conducted. A one-dimensional heat transfer equation and a kinetic equation, having respective initial and boundary conditions, were solved by means of numerical simulation. The finite difference method was employed to solve the resulting system of differential equations. The calculations were conducted using the RAD Studio software package. Graphical results were processed using the OriginPro software package.Results. Scenario modeling took into account the type of forest fire, the period of the fire hazard season, forest fuel properties, the degree of the forest fuel dispersion, and the initial moisture content in a forest fuel element. The authors have found that the major influence is made by the extent of dispersion and the type of forest fire. The similarity of qualitative characteristics of sooting has also been established for all types of forest fires.Conclusion. The proposed mathematical model can be used in conjunction with geoinformation systems to visualize the initial and output information in the process of assessment, monitoring and forecasting of forest fires and their environmental consequences.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117042910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Automatic and robotized firefighting systems at self-contained and low-maintenance facilities of the fuel and energy sector as an alternative to quick response teams","authors":"S. G. Nemchinov, S. Tsarichenko","doi":"10.22227/0869-7493.2022.31.02.63-70","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.02.63-70","url":null,"abstract":"Introduction. An important factor of the proper operation of the whole fuel and energy sector is the fire safety of its process facilities, designated for the transportation and distribution of electricity (power stations, transformer units), oil products and combustible gas (compressors and main pumps). These items of equipment are self-contained low-maintenance facilities located in remote areas.Scope of problems. The fire safety of self-contained low-maintenance fuel and energy facilities, including power stations, compressors and main pumps, entails the involvement of the field forces that cannot ensure reliable and effective fire protection at all times, given the economic inexpediency of their establishment at these facilities or their remoteness from the facilities. The authors propose using automatic fire safety systems composed of robotized fire extinguishing units and water film heat shields that may operate in the stand-alone mode.Research results. The authors have proven the ability of water film heat shields and stationary robotized fire extinguishing systems to ensure the fire safety of self-contained low-maintenance fuel and energy facilities. The proposed items of equipment should operate in the autonomous control mode that ensures timely and sufficiently effective fire protection by reducing the thermal impact of outdoor fires without the involvement of quick response teams.Conclusions. Given the need to ensure fire safety, the use of self-contained and low-maintenance fuel and energy facilities equipped with automatic fire extinguishing units that have robotized water monitors and water film heat shields is an effective alternative to quick response teams.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115865655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A study on mechanical properties of modern rolled structural metal at elevated temperatures","authors":"V. Golovanov, G. I. Kryuchkov, A. N. Strekalev, A. Komissarov, S. M. Tikhonov","doi":"10.22227/0869-7493.2022.31.02.52-62","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.02.52-62","url":null,"abstract":"Introduction. The purpose of this work is to obtain experimental data on the numerical dependence between the strength characteristics of the most widely used grades of rolled structural metal products (including those featuring high heat resistance) and a critical increase in temperature.Materials and methods. As the subject of research we used specimens of rolled metal of the following strength classes: С255 (steel St3sp), С345 (steel 09G2S), С390 (steel 14G2), and rolled metal that had high heat resistance properties S355P (steel 06MBF). Small cylindrical specimens of type B, with M10 thread on heads and the working diameter of 4 mm were used to conduct the static tension and compression tests of mechanical properties. The procedure encompassed the heating of the specimens to the pre-set testing temperature at the rate of not more than 10 °C/min, their 15-minute exposure, and testing for static uniaxial tension/compression.Results and discussion. The results of the experimental research on mechanical properties of different widely used grades of rolled structural steel, including heat resistant rolled metal, subjected to the fire impact, are presented in the article. The data are presented in the form of diagrams used to make a quantitative assessment of the effect of elevated temperature on the strength properties of rolled structural metal under the impact of fire. This information can be contributed to the design and operation of structural metal constructions to develop analytical methods of identifying the fire-resistance limits of constructions made of structural metal.Conclusion. The new data on the fire resistance of metal products allow for a more reasonable building design, higher safety and resistance of buildings and structures to the effect of fire. A wider area of application of the whole range of rolled products featuring higher heat resistance will reduce metal consumption and construction costs, boost competitiveness and attractiveness of steel structures and their application in the construction of buildings and structures of various purposes.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130737295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The fire safety of infrastructure facilities for hydrogen-powered vehicles","authors":"D. M. Gordienko, Y. Shebeko","doi":"10.22227/0869-7493.2022.31.02.41-51","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.02.41-51","url":null,"abstract":"Introduction. The article offers an analytical review of domestic and foreign publications on the fire safety of hydrogen refueling stations and garages for hydrogen-powered vehicles.General characteristics of the fire hazard of infrastructure facilities for hydrogen-powered vehicles. The authors offer the general characteristic of a specific fire hazard from facilities using compressed and liquid hydrogen.Hydrogen refueling stations. Refueling stations using compressed and liquid hydrogen were considered in the article. It was found that compressors are the most hazardous items installed at refueling stations; therefore, the value of potential risks, arising in the area of a refueling station, exceeds 10–4 year–1. Experiments, simulating accidents at hydrogen refueling stations, are described. According to the authors, the minimal distance between the compressor and facilities located outside the station area should exceed 50 m.Garages for hydrogen-powered vehicles. Features of the fire safety of garages for hydrogen-powered vehicles were analyzed. The authors have found that the overpressure inside a small garage (an individual garage) can reach 55 kPa in case of a jet flame caused by the release of hydrogen through the safety valves of fuel tanks. The overpressure of a hydrogen jet can reach 10 kPa in case of the unignited release of hydrogen. High pressure values that accompany the jet formation are triggered by the high normal burning velocity of hydrogen that boosts the velocity of heat release in the flame front, exceeding the same value for flares of hydrocarbon gases. Therefore, requirements, applicable to storage premises designated for vehicles powered by hydrocarbon fuel, may be erroneously extended to garages for hydrogen-powered vehicles (pursuant to NFPA 2).Conclusions. The results of this analysis can be contributed to regulatory documents to be developed in the area of fire safety of infrastructure facilities for hydrogen-powered vehicles.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127275074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The calculation of the regulated number of remote sensors of gas analyzers surrounding rectangular outdoor facilities at oil refineries","authors":"I. Samarin, A. V. Kryuchkov, A. Strogonov","doi":"10.22227/0869-7493.2022.31.02.33-40","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.02.33-40","url":null,"abstract":"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.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"297 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125249161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}