METHOD AND APPARATUS FOR THE LINING OF EXISTING PIPES

摘要

The method uses a support (1) incorporating a pipe clamp (2) at one end and an electrically heated swaging die at the other. The liner pipe, external diameter larger than the bore of the pipe to be lined, is made of plastics or other suitable material and drawn at ambient temperature through the swaging die and threaded through the pipe to be lined. The diameter of the liner pipe is reduced to and/or maintained at less than the inner diameter of the pipe to be lined by the tension applied by the drawing force.The drawing restrains the radial expansion of the outer surface of the liner pipe as it emerges from the swaging die.