Pipes and tubular conduits – Distinct layers – Bonded to each other
Patent
1983-12-19
1987-02-03
Anderson, Philip
Pipes and tubular conduits
Distinct layers
Bonded to each other
138 97, 138137, 156 78, 15624412, 15624413, 15624414, 156287, 264 455, 264 466, 264 469, 264514, 264516, 264565, 264173, 264178R, 2642093, 4251335, 425817C, B29C 6722, B29C 4706, F16L 5518, E21D 1100
Patent
active
046403132
ABSTRACT:
Pipelines for transporting sewage, water, slurries, liquid and gaseous hydrocarbons, and like materials are interlined with a composite tubular lining having an inner skin layer and a foamed layer contiguous with the inner skin layer. The foamed layer is either contiguous also, along its opposite surface, with the inner wall of the pipe or may be spaced therefrom by an outer skin layer of the composite lining. The lining may be applied either before the pipeline is placed into service or afterward, whether in situ or removed for maintenance or repair. For application in situ the lining is preferably more flexible than will suffice for insertion into new pipes. The lining itself is formed by extruding polymeric tubing for the inner layer and stabilizing it dimensionally, somewhat smaller than the pipe to be lined, then applying contiguously to the layer so formed a layer of foamable polymeric material, and optionally applying to the outer surface of the foamable layer a dimensionally expansible outer skin layer. The lining is inserted into the pipe to be lined, juxtaposed circumferentially to or near the inner wall of the pipe, then the foamable layer is foamed to expand the lining against the pipe wall, thereby lining the pipe.
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Whittington's Dictionary of Plastics, by Lloyd R. Whittington Stamford, Conn., Technomic, .COPYRGT. 1968, preface; pp. 22 and 169.
Anderson Philip
McClure Charles A.
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