Apparatus and method for controlling the introduction of chemical foamant into water stream in fire-fighting equipment
US5174383A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1988 |
| Grant date | Dec 29, 1992 |
| Priority date | — |
| Expiry date | Sep 8, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S261/26
- WIPO fieldControl
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.