Pozharovzryvobezopasnost/Fire and Explosion Safety最新文献

{"title":"Experimental determination of glazing efficiency in case of indoor explosions caused by accidents","authors":"A. Komarov, D. Korolchenko, N. Gromov","doi":"10.22227/0869-7493.2022.31.06.78-90","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.06.78-90","url":null,"abstract":"Introduction. The authors present the results of testing single and double glazing, used as explosion relief structures (ERS) to ensure the explosion resistance of buildings and structures in case of indoor explosions caused by accidents. The criterion of comparative effectiveness of ERS is the value of maximum pressure inside the premises caused by an emergency deflagration explosion and the response of an explosion relief structure. The lower the maximum pressure under otherwise equal conditions (the volume of the room, the area of the relief opening, the type of the explosive mixture), the higher the ERS effectiveness.Goal and objectives. The purpose of this study is to experimentally determine the effectiveness of glazing used as an explosion relief structure in case of emergency deflagration explosions inside buildings. It is necessary to solve the following tasks to attain the pre-set goal:experimentally determine the relief pressure of ERS, or single and double glazing during an indoor deflagration explosion;determine the maximum pressure inside the explosion chamber using glazing as ERS;conduct the comparative (also numerical) analysis of the results of experimental studies to confirm the accuracy of the ERS relief pressure value;compare the results of experimental studies with the calculated values of the ERS relief pressure obtained using the methods recommended in the regulatory documents.Research methods. In the course of ERS testing, an explosion chamber, having the operating volume of 8 m3 and the relief opening area of 1.3 m2 was used. Hence, the specific area of the ERS was 0.16 m2 per 1 m3, which is 3.2 times higher than that recommended in the regulatory documents. Therefore, any pressure, exceeding the threshold values (5–7 kPa) inside the explosion chamber, unambiguously shows the ERS inefficiency. Results and their discussion. The results of testing the 4 mm single glazing and the area of 1 m2 (meeting the requirements of paragraph 6.2.30 of SP (Construction Regulations) 56.13330.2021) show that such glazing is ineffective as the ERS. Excessive relief pressure and maximum pressure in a room with an extra area of the relief opening have high values: Prel = 11 kPa; Pmax = 12 kPa. Such loadings are destructive for industrial buildings and structures.High values of relief and maximum pressures (14.7 and 17.7 kPa) in a chamber (17.7 and 20.5 kPa) allow drawing a conclusion about the inefficiency of double glazing as ERS.In the course of testing both single and double glazing, considerable glass fragment dispersion (up to 30 m deep and up to 13 m wide) was observed, which could result in the injury of people near the building during  an accident.Conclusions. Experiments have shown that the assumed (calculated) glazing deflagration pressures, recommended by a number of regulatory documents and research publications, may differ significantly from the actual values, which may cause building collapses as a result of indoor explosions.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122218286","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":"Operability evaluation of electrical wires and cables subjected to simultaneous fire and current loadings","authors":"S. Puzach, O. Lebedchenko, V. Zykov, T. Chistyakov","doi":"10.22227/0869-7493.2022.31.06.56-67","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.06.56-67","url":null,"abstract":"Introduction. Intumescent coatings are used as a means of protection from heat flows, and their mission is to preserve the operability of wires and cables under fire conditions coupled with simultaneous current loading. However, the effect of insulation destruction on the operability of cables has not been studied for the case of a real fire regime.Goals and objectives. The purpose of the article is to evaluate the experimental operability of electrical wires and cables subjected to simultaneous effects of fire and current loadings.To achieve this purpose, an experimental testing unit was applied to conduct the experimental testing of wires and cables manufactured by various producers. At the same time, the temperature effect of the heated environment on electrical parameters of wires and cables, such as resistivity, inductance and capacitance, was evaluated.Theoretical background. In real fire conditions, dependence of indoor temperature, affecting the heating of cable insulation, differs essentially from the same dependencies in cases of various standard fire conditions. Therefore, the insulation destruction process may occur before the coating intumescence starts.Results and discussion. An experimental testing unit has been developed. This unit allows for the gradual cable heating with a pre-set temperature measurement interval and cable electrical characteristics. Dependencies of resistivity, inductance and capacitance of standard electrical cables on the temperature of the air surrounding the cable are obtained. It’s been discovered that the gradual heating of an electrical conductor or cable eventually leads to a short circuit between its conductive cores and further electric current transmission in electrical wires and cables. It is shown that phases and amplitudes of an input electrical signal can drastically change before the short circuit.Сonclusions. The simultaneous effect of fire and current loadings on standard electrical wires and cables causes a short circuit in the temperature range, in which no intumescence of flame retardant coatings is initiated on the insulation surface. Therefore, these coatings can ineffectively maintain the operability of electrical wires and cables.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126408342","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":"Simulation of nomograms showing the heating of steel structures with flame retardant coatings of different thicknesses (in the water)","authors":"D. Korolchenko, T. Eremina, S. Puzach, F. Portnov","doi":"10.22227/0869-7493.2022.31.06.30-46","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.06.30-46","url":null,"abstract":"Introduction. High temperatures cause deformation of steel structures which also lose stability and the bearing capacity, resulting in the collapse of structures with the subsequent collapse of the building. It is understood that intumescent paints are often used to increase the fire-resistance limits of steel structures up to R 90 and R 120. However the fire protection effectiveness of intumescent paints has not been sufficiently studied for the case of the long-term operation, and the application of this type of fire protection treatment of bearing steel structures requires justification. To ensure the building stability, coupled with the required fire resistance limit of structures, one should study the engineering factors affecting the fire resistance of steel structures that have intumescent paint coatings.Purpose of the research work. Development of approaches to simulation of nomograms demonstrating the heating of steel structures with flame retardant coatings of different thicknesses. The research work solved the following tasks:block diagrams of the research undertaking were developed to find the fundamental relationships between the dynamics of change in the structure of fire protection materials under thermal effects and the fire resistance limit of a building structure based on the choice of the functional criterion;mathematical models demonstrating dependence between the thickness of the dry layer of fire-retardant material were developed; the required fire resistance limit and thermo-physical characteristics of fire-resistant materials based on the experimental studies of the properties and effectiveness of fire-resistant materials were identified;nomograms showing dependences between the thickness of the dry layer of flame retardant materials and the flame retardant efficiency of flame retardants were made.Research methods. Hot Disk TPS 1500 thermal constant analyzer was used to analyze the thermo-physical characteristics of flame retardant materials. Thermal analysis was used to study the properties of flame retardants, as well as physical and chemical transformations occurring inside them under the programmed exposure to temperature effects and with the use of specialized thermal analysis equipment. The study of the fire protection efficiency for steel structures was conducted in accordance with GOST R (Russian State Standard) 53295–2009 “Fire protection means for steel structures. General requirements. The method of fire protection efficiency determination”.Results and their discussion. As a result of the research, an approach to prediction of the fire resistance of building structures was developed in the form of a research flowchart, used to choose the functional criteria. Experimental studies were conducted to identify mathematical dependences between the fire resistance and the indicators, which serve as functional criteria. In particular, when assessing the fire resistance of steel structures, a prediction is made on the ba","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122646232","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 the influence of climatic conditions on the heating of an outer wall of a liquified hydrocarbon gas tank","authors":"A. Parfenenko, A. Timofeev","doi":"10.22227/0869-7493.2022.31.06.68-77","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.06.68-77","url":null,"abstract":"Introduction. The article contains a theoretical study on the influence of climatic conditions in various regions of the Russian Federation on the heating of a side wall of a liquified hydrocarbon gas (LHG) tank if the firе runs through the whole vehicle, located at a gas station. Objectives of the study:analysis of the fire safety legislative framework applicable to gas station design;analysis of sources of domestic and foreign experimental studies on the fire impact of flames on an LHG tank;numerical simulation of the vehicle combustion in cold and warm seasons, taking into account the highest wind velocity in the Russian Federation;numerical simulations, conducted for a warm season to identify the critical surface temperature of a side wall of an LHG tank, and the design wind velocity corresponding to the air temperature in a Russian region.Materials and methods. The method of mathematical statistics is used to process maximum values of the air temperature and wind velocity for each Russian region and obtain the empirical values of the wind velocity and air temperature in the Russian regions. Calculations were made using the method of mathematical modelling of fire in warm periods to identify the critical surface temperature of a side wall of an LHG tank and the design wind velocity corresponding to the air temperature in the regions of Russia.Results. A dependence between the wind velocity and the air temperature in the Russian regions, as well as a dependence between the critical surface temperature of a side wall of an LHG tank and climatic conditions of the Russian regions was identified.Conclusions. The results, obtained by the researches, can be used to design the fire separation distance between the site designated for a fuel tanker truck (the parking lot for a vehicle before its fueling), an LHG tank and a gas station. ","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123679457","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":"Dependence of polyethylene combustion dynamics in a 1 m3 chamber on particle size","authors":"N. Poletaev","doi":"10.22227/0869-7493.2022.31.06.6-12","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.06.6-12","url":null,"abstract":"Introduction. The results of a standard study on the explosion hazard of polyethylene air suspensions (PES) can contribute to the theory of turbulent combustion. For example, analysis of polydispersity data and values of the PES lean combustion limit in a 1 m3 chamber helped to identify the maximum size of explosive particles d*m,t ≈ 100 µm (Poletaev, 2014). In this work, a relationship was obtained between the dynamics of PES combustion in a 1 m3 chamber and the average particle size of the suspension, which is understood as the average particle size of its explosive fraction d*50.Initial data. Well-known findings of a study on the explosion of 28 polyethylene specimens in a 1 m3 chamber were used. Continuous functions of specimen particles distribution by size, necessary for calculating d*50, were represented using the Rosin-Rammler distribution.Combustion dynamics. The dynamics of PES turbulent combustion in a 1 m3 chamber is described by the maximum rate of air suspension burnout Ub. Ub was calculated according to the formula (Kumar, 1992) intended for gas-air mixtures by substituting PES explosion parameters into this formula.Results and its discussion. The graph, describing the dependence of the complex d*50Ub on d*50, is provided. The averaged value of the complex (≈ 45 µm · (m/s)) is constant in the range 40 µm < d*50 < 90 µm. The latter is typical for the product of the particle size and the normal velocity of laminar flame in liquid aerosols (Myers, 1986), which indicates similarity between the effect of particle dispersion and dynamics of turbulent and laminar combustion of the aforementioned heterogeneous mixtures.Conclusions. The dispersive capacity of an explosive polydisperse polyethylene specimen is determined by the average particle size of the explosive fraction of the specimen d*50. The similarity of combustion patterns indicates the proximity of propagation mechanisms typical for turbulent flame, typical for PES, and laminar flame, typical for liquid aerosols.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127310292","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":"Using air-filled foam to contain and liquidate the flaming combustion of liquefied natural gas spills","authors":"M. Aleshkov, V. Molchanov, S. A. Makarov, D. Ioschenko, A. Tretyakov, V. V. Bareshkin, R. B. Bituyev","doi":"10.22227/0869-7493.2022.31.05.67-82","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.05.67-82","url":null,"abstract":"Introduction. Using air-filled foam to contain and liquidate the flaming combustion of liquefied natural gas spills is one of the most optimal methods of preventing the escalation of emergencies. However, the amount of data available today is insufficient to standardize the basic parameters of air-filled foam injection.The purpose of this research project is to justify the application of air-filled foam to contain and liquidate the flaming combustion of liquefied natural gas and identify the basic parameters of injection. The following objectives are to be attained towards this end:  assessment of the fire and explosion safety of liquefied natural gas and analysis of extinguishing means applicable to spills;  experimental determination of the insulating ability of foams, having different expansion factors, if applied to the surface of cryogenic fluid;  experimental determination of the fire-fighting efficiency of the foam used to liquidate the flaming combustion of liquefied natural gas;  experimental verification of expediency of the joint application of high expansion air-filled foam and extinguishing powders.Results and discussion. Having discussed the findings of the in-house experiments and analyzed the international and domestic tests conducted for this purpose, the authors assume that the application of the foam, whose expansion factor equals 300 to 500 units, can effectively contain and liquidate the flaming combustion of liquefied natural gas. The flaming combustion cannot be liquidated, if lower expansion factor foams are applied. The application rate of the high-expansion air-filled foam, exceeding 0.08 kg/(m2·s), is required to reduce the intensity of flaming combustion. Flaming combustion can be efficiently liquidated if the application rate of high-expansion air-filled foam is set at 0.17 ± 0.01 kg/(m2·s). Fire-extinguishing powders can only be efficiently applied to liquidate the flaming combustion of liquefied natural gas, if its surface is covered in foam.Conclusions. The authors have used their in-house experimental data, analyzed the literary sources and wellknown properties of the fire-extinguishing foam to justify the basic parameters of foam application aimed at the containment and liquidation of the flaming combustion of liquefied natural gas.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126756062","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":"Using the screening layer of granulated foam glass to reduce the evaporation of hydrocarbon liquids","authors":"E. Shiryaev, V. Nazarov","doi":"10.22227/0869-7493.2022.31.05.14-25","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.05.14-25","url":null,"abstract":"Introduction. The open surface of evaporation of hydrocarbon liquids during their storage in tanks (reservoirs) and in case of emergency spills are the fire hazards characterized by the mass rate of evaporation. The main way to reduce the fire hazard of hydrocarbon liquids is to isolate the evaporation surface of hydrocarbon liquids using various coatings, such as pontoons or floating roofs in tanks (reservoirs), and in case of emergency spills air-filled foam can be used, etc. An effective way to reduce the evaporation of hydrocarbon liquids is to isolate the evaporation surface using light slightly hygroscopic granular materials capable of being retained on the liquid surface by the Archimedean force. The authors address the analytical-experimental evaluation of a decrease in the mass rate of evaporation of hydrocarbon liquids when a layer of granulated foam glass shields the spill surface.Calculation methodology and results. A mathematical model has been developed to describe a reduction in the evaporation rate of hydrocarbon liquids through a “dry” layer of granulated foam glass, similar to the Bouguer – Lambert – Beer law. A method of experimental evaluation of the mass evaporation rate of hydrocarbon liquids through a shielding layer of granulated foam glass of different height has been developed. Screening coefficients for a number of hydrocarbon liquids and the averaged screening coefficient were identified using the results of an experimental research into parameters of evaporation of flammable liquids (acetone, gasoline AI-92, hexane, ethanol, kerosene, diesel fuel) through a “dry” layer of granulated foam glass of the Termoisol brand (fraction 5–7 mm) obtained using the methodology developed by the authors. Dependences between the rates of liquid evaporation through different thicknesses of a “dry” layer of granulated foam glass on the pressure of saturated vapours have been established. The area height, limited by the bottom concentration limit of the vapour flame, spreading during the evaporation of tested liquids from the free surface that may also have a shielding layer of Termoizol granulated foam glass is estimated analytically and experimentally.Conclusions. The developed mathematical model and the method of experimental estimation of the mass evaporation rate of hydrocarbon liquids allows to identify the evaporation rate of hydrocarbon liquids of different classes, and it can be used to study the parameters of evaporation shielded by materials having different granulo metric compositions.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122795093","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":"Aspects of implementation of automatic fire containment systems","authors":"L. Tanklevskiy, A. Tarantsev, A. Bondar, I. D. Balabanov","doi":"10.22227/0869-7493.2022.31.05.43-53","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.05.43-53","url":null,"abstract":"Introduction. The authors specify the areas of application of automatic fire-prevention systems and the objects that they protect; they also substantiate the main principles of their design and development. Rational hydraulic sprinkler arrangement patterns are designed for automatic water fire-containment systems to be installed in large and small premises, depending on the thermal loading of structures.Goal and objectives. Development of recommendations on the use of automatic fire-containment systems and the objects that they protect.Materials and methods. Fire development patterns were subjected to theoretical and experimental research conducted during variable intensity water supply.Results and their discussion. As a result of this research, general engineering requirements for automatic water fire-containment systems and their testing methods were first developed.Conclusions. The first edition of GOST (All-Russian State Standard) “Automatic water fire-containment systems. General engineering requirements. Testing methods” were addressed to the organizations concerned with this area of knowledge; their opinions and suggestions were contributed to another approved edition of this GOST (All-Russian State Standard).","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122973934","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":"Building structures of thermal power plants: analysis of fire resistance limits","authors":"S. Puzach, T. Eremina, F. Portnov","doi":"10.22227/0869-7493.2022.31.05.33-42","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.05.33-42","url":null,"abstract":"Introduction. The author analyzes real-life fire resistance limits of metal structures for one building of a thermal power plant. Experimental and computational methods were applied to identify the fire resistance limits of building structures. The temperature setting of the research, conducted to solve the problem, was the same as that of a real fire.Research goal and objectives. The purpose of the analysis is to identify the fire resistance limits of structures comprising the building of a thermal power plant using the method of heat-mass exchange analysis that takes account of conditions of a real fire. The following objectives are to be attained in compliance with the pre-set goal:to analyze the principal provisions of technical norms and regulations in terms of the fire safety of building structures of thermal power plants;to justify the principal provisions for the method of heat-mass exchange analysis, taking into account real-life fire conditions;to justify the need to improve the real-life fire resistance limits by fire-proofing agents with account taken of the most dangerous scenario of the real fire development.Methods of research. The heat-transfer equation is analyzed to identify the distribution of temperatures inside a building structure for a one-dimensional case. The field-based method of analysis is applied to solve this problem. This method is generally applied to premises having complex geometric configuration, if one geometric dimension exceeds the others.Results and their discussion. The authors have analyzed the most dangerous fire scenario characterized by the most dangerous impact on metal structures, such as the furnace oil fire spill in a boiler room.The authors also address the most dangerous fire propagation scenario in terms of the heating of bearing metal structures: the combustion of furnace oil spills in a boiler room. The computations have proven that in case of the selected fire development scenario maximal temperatures of bearing metal structures are much lower than the critical temperature of 500 °С fifteen minutes after the onset of fire.Conclusions. Having analyzed the fire resistance computations of thermal power plant structures, including their metal constructions, the have found that in case of emergency, resistance to the most dangerous manifestations of fire exceeds the required R15 value. No fireproofing of bearing metal structures in the boiler room is needed.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129463443","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":"Using synchronous thermal analysis to study characteristic features of a developing fire","authors":"O. Bezzaponnaya","doi":"10.22227/0869-7493.2022.31.05.26-32","DOIUrl":"https://doi.org/10.22227/0869-7493.2022.31.05.26-32","url":null,"abstract":"Introduction. The purpose of the work is to estimate the temperature of impact on the material under study using the results of synchronous thermal analysis. This task is solved to achieve the pre-set purposes: studying the process of the thermal-oxidative destruction of the material under study, developing thermal impact assessment criteria, and deriving equations to determine the temperature of impact.Materials and methods. Specimens of ROTBAND gypsum finishing putty, frequently used for the interior decoration of walls of buildings and premises, have been studied. Before testing, putty samples were subjected to the preliminary thermal impact of 200, 300, 400, 500, 600, 700, and 800 °С for 30 min. The tests were carried out using the method of synchronous thermal analysis (Netzsch STА 449 F5 Jupiter) in corundum crucibles at a heating rate of 20 °С/min and with an air flow rate of 75 ml/min.Research results and discussion. Mass loss at a temperature of 200 °C and ash residue at a temperature of 900 °C can be expediently used as the criteria for assessing the temperature of impact on the gypsum putty using thermal analysis methods. Equations are obtained to calculate the temperature of impact on the gypsum putty composition according to the thermos-analytical characteristics of putty specimens. Conclusions. The study demonstrates that synchronous thermal analysis can be applied to determine the temperature of impact on the material under study, which is vital for the analysis of a developing indoor fire.","PeriodicalId":169739,"journal":{"name":"Pozharovzryvobezopasnost/Fire and Explosion Safety","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134621304","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}