EXPERIMENTAL RESEARCH OF BURN RATE AND TERMS OF EXTINGUISHING OF STANDARDIZED FIRE SOURCE OF CLASS B BY CONSISTENT APPLICATION OF GRANULAR FOAM GLASS AND GEL-FORMING EXTINGUISHANT

The disadvantages of extinguishing agents of combustible liquids are analyzed. It is shown that the low efficiency of application of standard foams for extinguishing has necessitated the development of effective fluorine synthetic foam agents forming an insulating film of aqueous solution. The attention is on the fact that the toxicity of these foaming agents is a necessity to search for fundamentally new agents for extinguishing fires of class B. The perspective of search for floating non-combustible systems as a carrier for surface fire-extinguishing agents or directly for extinguishing is shown. It is proposed to use hard-granular materials of low density to extinguish fires of flammable and combustible liquids. The results of the experiment on extinguishing the standardized fire source of class B with the extinguishing system based on granular foam glass with additional influence of components of gel forming systems are presented. It is established that the application of a layer of foam glass to the surface of burning gasoline reduces its combustion rate. It is shown that there is a significant difference in the mass burn rate between the laboratory and the model experiment, which may be explained by the different height of the freeboard. In the range of thickness of the layer of foam glass 0 - 6 cm this decrease is small. During the subsequent growth of the thickness of the layer over 6 cm there is a rapid decrease in the mass burn rate of gasoline. Foam glass with a granule size of 1–1.5 cm. slows down the burn rate of gasoline to the greatest extent. To ensure the combustion termination with a slight supply of components of the gel forming systems is possible with a thickness of a layer of foam glass of 10 cm for a fraction of 1–1.5 cm and a thickness of 12 cm for fractions 1.5–2.5 cm and 2.5–4 cm. To achieve absence of re-ignition when burning flame of a torch above a surface of a foam glass is possible at application of a layer of a gel at a superficial consumption 0,5–0,8 g / sm2 for a fraction of 1–1,5 cm and 1–1,2 g/sm2 for fractions of 1.5–2.5 cm. For a fraction of 2.5–4 cm behind the studied thicknesses of the foam glass layer, the effect of the absence of re-ignition cannot be achieved