Method and system for extinguishing fire in an enclosed space

Details Method and system for extinguishing fire in an enclosed space Method and system for extinguishing fire in an enclosed space

A - Human Necessities

62

C

A62C 3/00 (2006.01) A62C 99/00 (2010.01) A62C 3/08 (2006.01)

Patent

CA 2357422

A system for suppressing fire in an enclosed space, e.g. an aircraft cabin or freight compartment, includes nitrogen tanks and/or generators to rapidly supply a limited quantity of nitro- gen with a high flow rate, and a membrane system to supply an essentially unlimited quantity of nitrogen at a lower supply rate for a long duration. The membrane system includes a selectively permeable membrane that separates nitrogen gas from ambient environmental air that is supplied into the membrane system. Once a fire is detected, nitrogen is supplied from the nitrogen gas tanks and/or generators at a high rate to rapidly increase the nitrogen concentration and establish a reduced oxygen concen- tration (e.g. 12 vol.%) in the enclosed space. Then, nitrogen is supplied from the membrane system at a reduced rate for a long duration to maintain the reduced oxygen concentration in the enclosed space until the fire is extinguished by oxygen starva- tion.

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