Fire Safety Science Digital Archive

The Ministry of Supply asked the Joint Fire Research Organization for advice on the method of applying chlorobromomethane to petrol fires. Experiments were made with petrol fires ranging between 11 in. diameter and 10 ft. square and also on aircraft fires. Comparisons were made with chlorobromomethane applied as plain jets, cone sprays, and different types of flat sprays, and comparisons were also made between chlorobromomethane and carbon tetrachloride. Flat sprays were superior to plain jets or cone sprays, and the lateral spread of the spray was the controlling factor in the efficiency of the nozzle, provided that the rate of delivery per unit of area was above a minimum value, which in these trials was about 0.01 gal/sq ft/min Some measurements were made of the decomposition products in the atmosphere near to the fire.