Patent ID: 6679293
Filing Date: 2004-01-20
Classification: B29C,F16L

Abstract:
A method for trenchless rehabilitation of an existing pipeline by pulling a flexible resin impregnated liner into the existing pipeline from a first access opening to a second access opening and everting a flexible inflation bladder into the pulled in liner to conform the liner to the existing pipeline and curing the resin in the liner, comprising:providing a supply of flexible resin impregnated liner; pulling a leading end of the flexible liner into the pipeline from one of the access openings to be the eversion access to the other access opening to be the receiving access with the ends of the liner extending beyond the ends of the pipeline; providing a supply of flexible inflation bladder stored in a bladder canister; introducing an eversion fluid under pressure into the interior of the bladder to evert the bladder into the liner to the receiving access; forming an opening in the bladder in the receiving access while maintaining pressure in the interior of the bladder and allowing the eversion fluid to flow-through the bladder and exit the receiving access; introducing a pressurized curing fluid into the interior of the bladder at the eversion access so that the curing fluid flows through the bladder and exits through the opening in the bladder; and allowing the resin in the liner to cure.