Scale effect of cup burner on flame-extinguishing concentrations

In an attempt to reduce the amount of chemical used in fire suppression testing of halon alternative agents, smaller cup burner systems than that of ISO were constructed, and the flame-extinguishing concentrations of Halon 1301 for three liquid fuels were measured. Reducing the cup diameter or the chimney diameter of the cup burner changed significantly not only the flame-extinguishing concentrations but also the flame behavior near extinction. Nevertheless, the reduced size cup burners with which the flame-extinguishing concentration was equal to that of the ISO cup burner were found. One cup burner can reduce the amount of extinguishing agent used in testing by 90%.