Coating apparatus – Projection or spray type – Work-supported and guided carriage
Patent
1989-11-17
1991-03-05
Wityshyn, Michael G.
Coating apparatus
Projection or spray type
Work-supported and guided carriage
118317, 118DIG10, B05B 1306, B05C 708
Patent
active
049969404
ABSTRACT:
Apparatus and method for impregnating and sealing and simultaneously improving the tensile strength of pipeline or conduit buried in the ground. The structure consists of a pair of axially spaced, deformable blocking and sealing devices whose interval is appropriately maintained. One of the blocking devices or "pigs" conveys conduit for introducing air under pressure greater than surrounding hydrostatic pressure on the conduit exterior to the space between the blocking devices to force out water or contaminants and also means for introducing two parts of a compound to impregnate, seal and bond to the interior conduit surface. The structure is also provided with a camera chip on the "pig" which contains the structure for conveying the air and the parts of the compound for observation by remote camera of the operation. The compound is a fast drying compound enabling relatively continuous operation by winching the structure along the conduit. The method to be practiced involves first selectively sealing off a section of conduit, then driving out the contaminating material by increasing the pressure within the sealed off section, and then spray in conical form the compound material and catalyst to quick dry and then axially moving on downstream in the conduit. Fibre or sand may be added to the compound for strength and plugs may be used to seal lateral apertures.
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Swartwout, III Willis B.
Wityshyn Michael G.
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