Influence of total head of foam on optimum intensity and minimum particular expense solution size of foamer

Abstract

The issues addressed included questions and prospects for use of the hydrocarbonic and fluorinated film-forming foamers for fire suppression of emergency passages and the fires of oil products in tanks at supply of foam from long distance. The results of the experiment show that hydrocarbonic foams with increase in falling height cause strong decrease in efficiency of fire suppression. The blow of foam about a surface conducts to partial immersions in oil product that leads to foam pollution by fuel. It is shown that using hydrocarbonic foamers with growth of total head from 5 to 15 cm a particular expense size and optimum intensity 2 times increase. While the fluorinated foams show increase inefficiency of fire suppression by increase in total head which is explained by superficial activity - aqueous solutions of film-forming foamers have positive value of spreading coefficient. The higher the drainage is, the stronger the foam and hydrocarbon surface hit that leads to the accelerated release of solution from foamy films more strongly and promotes fast foam spreading. Experiments confirm expert's opinion about low efficiency of the foams, received their hydrocarbonic foamers when giving with compact streams on long distance. Therefore, replacing of fluorinated film-forming foamers with hydrocarbonic ones, which decay after application well, is premature.