Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Patent
1987-06-09
1991-01-01
Pal, Asok
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
134 36, 134 2213, 134167C, 134168C, B08B 904
Patent
active
049815245
ABSTRACT:
Coating with clinging foam the upper interior walls of a generally horizontal pipe. A high-pressure pump, connected to a source of water, 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 then, after working at foam to the desired expansion ratio, to the nozzle. A skid supports the nozzle and has a series of skid rods regularly spaced around it so that at any time two of the skid rods engage the bottom part of the wall of the pipe to be coated and hold the nozzle well above the liquid flow in the pipe's bottom. 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, while preventing expulsion toward the bottom portion.
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Airrigation Engineering Co., Inc.
Pal Asok
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