Cleaning and liquid contact with solids – Apparatus – For work having hollows or passages
Patent
1989-10-18
1990-07-31
Pal, Asok
Cleaning and liquid contact with solids
Apparatus
For work having hollows or passages
134 24, 134 36, 134168C, 134169C, 134172, B08B 904
Patent
active
049443208
ABSTRACT:
Coating with clinging foam the upper interior walls of a generally horizontal pipe. A high-pressure pump delivers jetting water to a nozzle through a normally reeled hose. The nozzle has a body divided by a pressure-actuated valve into two chambers, the first one having a series of high-pressure jet exits. The valve is normally open and, when the high pressure is off, leads into a second chamber having a foam outlet. Two pump and metering devices and a compressor then deliver water, chemical and air mixed into a damp sloppy foam to the hose and thence to the nozzle. A skid supports the nozzle and has a series of skid rods regularly spaced around it. A gravity-operated device at the outlet is connected to the foam outlet from the nozzle's second chamber and causes expulsion of the foam toward the walls of said pipe lying along a predetermined upper sector only. The high-pressure pump thus sends water into the nozzle to cause closure of the valve and exit of the water through the jet exits, to jet the nozzle along the pipe to a desired position, while unreeling the hose. Then, the high-pressure pump is de-activated, with consequent opening of said nozzle's valve, and the pumps and metering devices and compressor are actuated to supply the nozzle with a foamed mixture of water, foaming chemical and air. The hose is reeled in at a predetermined rate so that clinging foam is impinged in a metered amount against the upper portion of the pipe walls.
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Chance, Jr. Nathan H.
Edmiston Robert A.
Waite Diana H.
Airrigation Engineering Co., Inc.
Pal Asok
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