![]() ![]() It should be noted that, for example, explosion will not occur with no reason, and before explosion, there may be leakage, gas dispersion, and then sometime flash fire, dike fire may occur and result in BLEVE and fireball. Heat radiation need not be considered since burning time is very short, may be shorter than one second. The risk is being involved in the flame, but not heat radiation.Risk from flash fire is limited to the area of the gas concentration within the explosion limit. Gas concentration is to be within the range of explosion limit.Pressure wave is not generated, so no mechanical damage by the impact.Rapid burning of the flammable gas cloud, but not to generate high pressure wave.įlammable gas is dispersing and traveling to an ignition source, if the concentration of the gas exceeds LEL (lower explosion limit), then burned rapidly. Heat radiation from the burning sphere is high intensity to damage to the surrounding facilities and persons. When amount of flammable vapor is discharged into the atmosphere in case of BLEVE etc., and ignited, the vapor is rapidly burned to become burning sphere floating in the air. ![]() Rapture of a pressure vessel causes rapid depressurizing and rapid boiling of the liquid to generate pressure wave. BLEVE (Boiling Liquid Expanding Vapor Explosion).Vapor cloud explosion in outdoor, strong pressure wave is generated to damage seriously. In addition, the possibility of flash fire and the extent of damage are studied by together with gas dispersion simulation. The software calculates pressure wave from BLEVE or VCE possibly occurring in chemical plants, etc., and diameter, height of the center of fireball following BLEVE with its generated heat radiation. Indoor explosion is simulated in numerical calculation. Please note this program is for explosion in open area (outdoor). Our software is based on the disaster prevention guidelines of the petrochemical complex in Japan (hereinafter referred to as “Combi-Guidelines”) and Guidelines for Vapor cloud explosion, pressure vessel burst, BLEVE, and flash fire hazard by American Institute of Chemical Engineers (AIChE). Simulation method is different for each disaster, but our program can deal with everyone. Concerning explosion, there are several kinds of disasters depending on the cause of outbreak as described below. Disasters involved in refineries and chemical plant handling hazardous materials are mainly fire, gas dispersion and explosion. ![]()
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