Method of installation of a flexible cured in place lateral seal in an existing main pipeline

  • US 6,068,725 A
  • Filed: 11/26/1997
  • Issued: 05/30/2000
  • Est. Priority Date: 11/26/1997
  • Status: Expired due to Term
First Claim
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1. A method of installation of a resin impregnated cured in place lateral seal for lining the connection between a main pipeline and a lateral pipeline, wherein the lateral seal includes a brim portion and a tubular portion, each having an impermeable layer on one side thereof, comprising:

  • placing a lateral seal which has been impregnated with a curable resin on a first inflatable bladder assembly having a lined recess with an inflatable arm which when inflated extends radially from the bladder, the impermeable layer of the brim portion facing the expandable bladder and the tubular portion of the seal inverted into the arm which is retracted into the recess in the bladder;

    releasably securing the bladder assembly with impregnated lateral seal onto a displaceable sled;

    inserting the bladder assembly with loaded seal and displaceable sled into a main pipeline from an access opening;

    locating the sled and bladder assembly at the lateral connection at a point remote to the access opening;

    positioning the resin impregnated brim portion against the interior of the main pipeline at the connection with the lateral pipeline;

    inflating the bladder to press the resin impregnated brim portion against the interior of the main pipeline and everting the arm of the bladder out through the opening in the brim portion to evert the tubular portion of the seal into the entrance to the lateral pipeline;

    continuing to apply pressure to the bladder to press the brim portion against the main pipeline and the tubular portion against the lateral pipeline;

    applying radiant energy from a source within the bladder assembly onto the resin impregnated seal to initiate the resin cure;

    allowing the resin to cure;

    placing a second impregnated lateral seal on a second bladder cartridge during the time the first seal is being positioned and cured;

    ceasing to apply radiant energy;

    deflating the bladder and extended arm in the first bladder assembly;

    removing the sled and first bladder assembly from the access opening;

    removing the first bladder assembly from the sled; and

    inserting the second bladder assembly with a second impregnated seal onto the sled for lining another connection between the main line and a lateral pipeline.

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