Plastic article or earthenware shaping or treating: apparatus – With transportation device for relocating molding apparatus...
Patent
1994-03-11
1996-06-11
Davis, Robert
Plastic article or earthenware shaping or treating: apparatus
With transportation device for relocating molding apparatus...
425335, 425367, 425397, B29C 5300
Patent
active
055250491
ABSTRACT:
An apparatus and method for deforming polymeric pipe to have a reduced diameter for insertion into new or damaged pipelines in situ. A further method for converting existing pipelines in situ to dual-containment pipelines. The apparatus includes a plurality of adjustable rollers and conveyor systems in a portable unit which accommodates variable pipe specifications. As a polymeric pipe is conveyed through the apparatus, a deforming means applies a gradually increasing pressure along the length of the pipe to collapse the pipe and form a longitudinal depression therein while preventing rotation of the pipe. The deformed pipe exits the apparatus after being shaped into a cylindrical form with a reduced diameter. When lining pipe, the deformed pipe is inserted into an existing pipeline and returned to its original cylindrical form. When converting to dual-containment pipelines, the deformed pipe will have a plurality of spacers attached thereon such that when the pipe is inserted and reformed it will be axially aligned within the existing pipeline providing an annular space between the existing pipe and the inserted pipe.
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"Typical Specification for PLEXCO EHMW PE3408 High Density Polyethylene Pipe and Fittings", Plexco, Bensenville, IL, pp. 1-2, (No date).
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