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Shebeko Y.N.,All Russian Scientific Research Institute for Fire Protection | Shebeko A.Y.,All Russian Scientific Research Institute for Fire Protection
Journal of Loss Prevention in the Process Industries | Year: 2015

The BLEVE (boiling liquid expanding vapor explosion) effect that involves the formation of a fireball occurs at the engulfment by fire of a tank with a highly flammable liquid or a liquid gas. Heating of the tank causes elevation of the liquid phase temperature and pressure inside the tank. A partial rupture of the dry tank walls is possible, with the formation of a rarefaction wave propagating into the liquid phase. An evaporation wave moves after the rarefaction wave and cause a rapid increase of pressure, exceeding the initial pressure before depressurization. Rapid violent destruction of the tank occurs. The mechanism of a BLEVE initiation is considered using Van der Waals isotherms. The following criterion for the possibility of a BLEVE was formulated. If the final state is located on an unstable part of the Van der Waals isotherm, a BLEVE takes place. Limiting values of the temperatures for overheating of certain highly flammable liquids and liquid gases (propane, n-butane, n-pentane, isopentane) were calculated using the proposed method, and were found to be in good agreement with experimental data available in the literature. © 2015 Elsevier Ltd. Source


Shebeko Y.,All Russian Scientific Research Institute for Fire Protection | Shebeko A.,All Russian Scientific Research Institute for Fire Protection
Science and Technology of Energetic Materials | Year: 2011

Conditions of fire and explosion safety at a determination of permissible parameters for an operation of industrial facilities are considered. Relationships were obtained which describe a dependence of safe values of the parameters at an established probability of an occurrence of an unfavorable event (that is hazardous event with fire or explosion characterizing by an inadmissible risk level). The proposed method was tested on the basis of calculations of a probability of a successful evacuation from buildings and constructions in the case of a fire and safety coefficients to fire and explosion hazard indexes of substances and materials. Source


Azatyan V.V.,Russian Academy of Sciences | Shebeko Yu.N.,All Russian Scientific Research Institute for Fire Protection | Shebeko A.Yu.,All Russian Scientific Research Institute for Fire Protection
Journal of Loss Prevention in the Process Industries | Year: 2010

The influence of additives of various chemical natures (CH4, N2, CO2, and steam) at a laminar burning velocity Su of hydrogen in air has been studied by numerical modelling of a flat flame propagation in a gaseous mixture. It was found that the additives of methane to hydrogen-air mixtures cause as a rule monotonic reduction in the Su value with the exception of very lean mixtures (fuel equivalence ratio φ{symbol} = 0.4), for which a dependence of the laminar burning velocity on the additive's concentration has a maximum. In the case of the chemically inert additives (N2, CO2, H2O) the laminar burning velocity of rich near-limit hydrogen-air flames drops monotonically with an increase in the additive's content, but no more than 1.5 times, and the adiabatic flame temperature changes slowly in this case. In the case of methane as the additive, the laminar burning velocity is diminished approximately 5 times with an increase in the adiabatic flame temperature from 1200 to 2100 K. Deviations from the known empirical rule of the approximate constancy of the laminar burning velocity for near-limit flames are shown. © 2009 Elsevier Ltd. All rights reserved. Source


Shebeko A.Y.,All Russian Scientific Research Institute for Fire Protection | Shebeko Y.N.,All Russian Scientific Research Institute for Fire Protection | Zuban A.V.,All Russian Scientific Research Institute for Fire Protection | Navzenya V.Y.,All Russian Scientific Research Institute for Fire Protection
Journal of Loss Prevention in the Process Industries | Year: 2013

An experimental investigation of an influence of trifluoromethane CHF3, pentafluoroethane C2HF5 and perfluorobutane C4F10 on near-limit hydrogen-nitrous oxide and methane-nitrous oxide premixed flames was performed. Flammability limits, a maximum explosion pressure ΔPmax, maximum rate of pressure rise (dP/dt)max, and a laminar burning velocity Su were determined. The flammability area in the case of N2O as an oxidizer is substantially wider than for the case of the oxidizer which is the mixture of oxygen and nitrogen with the O2 content 25% (vol.). The dependences of Su, ΔPmax and (dP/dt)max on concentration of the fluorinated hydrocarbons are characterizing by an availability of maxima which positions are close to the peak concentrations of the flammability regions. A qualitative interpretation of the results obtained is given. © 2013 Elsevier Ltd. Source


Shebeko A.Y.,All Russian Scientific Research Institute for Fire Protection | Shebeko Y.N.,All Russian Scientific Research Institute for Fire Protection | Zuban A.V.,All Russian Scientific Research Institute for Fire Protection | Golov N.V.,All Russian Scientific Research Institute for Fire Protection
Fire Safety Journal | Year: 2015

This article describes a method for testing the safety of construction materials with respect to mechanical sparks (spark safety). This method was tested on examples of various materials and flammable gases. Hydrogen, acetylene, petrol, methane and LPG were used as the flammable gases. Various types of steel, aluminium, and copper and aluminium alloys were used as the construction materials. On the basis of the experiment a criterion for spark safety was proposed. © 2015 Elsevier Ltd. All rights reserved. Source

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