Fire Safety Science Digital Archive

The conventional fire extinguishing gas-agent system has configuration in which the gas-agent comes out of a cylindrical container having vertically settled shape. However, in this research a horizontally installed container of piping shape having a cylinder of the same shape with a cylinder valve and a discharge nozzle was used, and the relationship between orifice size of nozzle and discharge rate of gas-agent was investigated through various experiments including the measurement of discharge rate under different ambient-temperature conditions. In such experiments, HCFC Blend A was used without super-pressurization by nitrogen. From this research, it was observed that legal discharge duration of 10 seconds can be met if the relatively large size of the valve and the nozzle orifice were properly selected. This research outcomes proves that a new method will be more effective, more economical and safer than the conventional method.