Method and apparatus for fabricating a flexible lining with flexible collar for lining lateral pipelines

  • US 6,044,867 A
  • Filed: 06/29/1999
  • Issued: 04/04/2000
  • Est. Priority Date: 11/26/1997
  • Status: Expired due to Term
First Claim
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1. A method of fabrication of a cured in place lateral seal in the shape of a top hat formed of a resin impregnable material having an impermeable layer bonded thereto, comprising:

  • providing a length of a pipe template having an opening for a lateral connection, the template and opening dimensioned to conform to the configuration of a main pipeline and the lateral to be sealed;

    preparing a ring member from a substantial planar piece of the resin impregnable liner material having an inner opening corresponding to the opening in the pipe template;

    placing the ring about the opening with the impermeable layer facing the pipe template;

    inserting a tubular portion of resin impregnable liner material with the resin absorbent material on the outside into the opening in the ring and template;

    placing an expandable plug through the opening in the template by passing it into the tubular portion;

    expanding the plug to urge the tubular portion against the opening in the ring;

    bonding the adjacent resin impregnable layers of the ring and tubular portion together;

    deflating and removing the plug;

    removing the assembled ring and tubular portion from the pipe template; and

    trimming the portion of the tube extending from the surface of the ring having the impermeable layer to form the top hat shape.

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