GB218340A - Method of and apparatus for fire-extinguishing - Google Patents

Abstract

218,340. McElroy, R. L., and Shepherd, J. E. Jan. 5, 1923, Fire-extinguishing by solutions and liquid mixtures and by foam; chemicals and substances.- Gas and foam generating chemicals, such as sodium bicarbonate and aluminium sulphate, with or without a cementitious material, such as cement, lime, plaster of Paris, &c., mixed with sand or other refractory granular material, are supplied by gravity and an air or gas blast to a stream of water, with or without carbon tetrachloride &c., in which stream they are carried in suspension on to the fire. The dry salts, cement, sand, &c. are stored in containers A, and are delivered by rotating agitators through apertures, fitted with adjustable slides, into hoppers 11, which are provided with rotating feed-drums having delivery pockets on their peripheries. The feeding-devices &c. are driven from a motor M. Compressed air is delivered from a compressor 52 to a reservoir 45, and thence through pipes 44, 43 to perforated rings in the hoppers 11. The chemicals &c. are thus carried by an air blast through pipes 12, 13 to a discharge nozzle 15, to which are delivered, by air pressure, water from a tank 18 and carbon tetrachloride from a tank 20. The cementitious material and other substances are adapted to adhere to a burning surface.