On ignition of combustible material in a gas explosion in the premise

Abstract

Introduction. There are known cases of fires after gas explosions in domestic residential premises, exacerbating an already dangerous situation. Determining the conditions for the occurrence of such fires, as well as the process of behaviour of combustible materials during the short-term thermal effect of a gas explosion, allows us to hope for the possibility of reducing fire risks through research and the development of appropriate measures. Methods Experimental studies were carried out in a cubic chamber with a volume of 10 m3 filled with a propane-air mixture. Explosion pressure and video inside the chamber were recorded. To assess the magnitude of the effects of flame and combustion products of a gas explosion on combustible material, specially developed indicators with a sensitive element – sheet of paper. Results. The images of sensitive elements of indicators with the level of brightness after exposure to a flame and combustion products of a gas explosion are presented. Frames from a video camera installed inside the camera are also presented. Discussion. The conditions for ignition of combustible materials are: low heat capacity, position in the volume of premise and the entry of outside air. Conclusions. It is established that combustible materials in the corners of premise are less affected by the flame and combustion products of a gas explosion. Combustible material ignites when external air enters after an explosion.