Apparatus and method for controlling the introduction of chemica

Details Apparatus and method for controlling the introduction of chemica Apparatus and method for controlling the introduction of chemica

1988-09-08

1992-12-29

Focarino, Margaret A.

Fire extinguishers

Fluid systems

Plural source, mixing in transit

169 13, 169 44, A62C 502

Patent

active

051743833

ABSTRACT:
Fire-fighting apparatus and the method of using of same in which water from a supply source is adapted to be pumped at high pressure and predetermined flow rates through a fire hose and in which metered quantities of a chemical foamant are injected into the fire hose and mixed with the water stream to increase the effectiveness of the mixture as a fire extinguishant. A special purpose computer module is configured to monitor the flow rate of the water through the hose, the level of chemical foamant in a supply reservoir and the speed of the positive displacement pump used to inject the foamant. The computer then determines an appropriate speed for the pump and provides a closed-loop control signal to the pump's drive motor to maintain a desired chemical injection rate.

REFERENCES:
patent: 4324294 (1982-04-01), McLoughlin et al.
patent: 4474680 (1984-10-01), Kroll
patent: 4526234 (1985-07-01), Little
patent: 4554939 (1985-11-01), Kern
patent: 4830589 (1989-05-01), Pareja

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