Patent ID: 6044867
Filing Date: 2000-04-04
Classification: F16L

Abstract:
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; andtrimming the portion of the tube extending from the surface of the ring having the impermeable layer to form the top hat shape.