Fire extinguishers – Fluid systems – Gas-pressure discharge
Patent
1995-08-31
1997-05-27
Hoge, Gary C.
Fire extinguishers
Fluid systems
Gas-pressure discharge
169 15, A62C 3502
Patent
active
056323387
ABSTRACT:
A low pressure, self-contained fire suppression system comprising a source of pressurized gas, a water reservoir tank containing water, a foam concentrate tank containing foam concentrate, and a water driven volumetric metering pump. The source of gas under pressure communicates with the water reservoir tank to provide a source of water under pressure. A conduit communicates the pressurized water tank with a first inlet port of the metering pump. The foam concentrate tank communicates with the metering pump via a second inlet port. Concentrate is supplied to the metering pump at a predetermined volumetric flow rate in response to water flowing through the metering pump. The source of pressurized gas also communicates via a conduit with the outlet port of said metering pump to thereby introduce gas under pressure to the water/foam concentrate mixture as it exits the metering pump. The water, foam concentrate and gas mixture is passed through a conduit, such as a hose, wherein a foam is generated. The foam passes to a valve and nozzle assembly where the foam can be directed to a fire or structure to be protected from an advancing fire. The source of pressurized gas communicating with the water reservoir and the outlet port of the metering pump is adjusted to maintain the pressure of the water and the gas going to the outlet port of the metering pump at substantially the same pressure of between about 30 and about 70 psig. The system requires no connection to external power or water to generate fire suppression foam.
REFERENCES:
patent: 3337195 (1967-08-01), Farison
patent: 3750754 (1973-08-01), Stults
patent: 3822217 (1974-07-01), Rogers
patent: 3977474 (1976-08-01), Goegli
Engineering Analysis of Threshold Compressed Air Foam Systems, U.S. Dept. of Agriculture, Oct. 1987, pp. 2 & 3 especially.
Diaphragm Pressure Tanks, Water Ace Pump Co., Feb. 1993.
Volumetric Metering Pumps, Dosatran International.
Hoge Gary C.
Howard Robert E.
The Hunter Group Corporation
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