METHOD FOR FITTING AN INNER TUBE IN AN EXISTING PIPELINE USING AIR VENTING MEANS, AND PIPELINE WITH INNER TUBE OF THERMOPLASTICS

摘要

the coating is a pipe (1) with an inner tube (2) in the old in a thermoplastic medium pressure, the inner tube forming the coating (2), and then the cooling medium under pressure.in order to prevent the swelling of the air located between the inside of the pipe (1) and the outside of the inner tube (2), the low longitudinal ribs are placed externally (2a) of the inner tube (2). during swelling, the inner tube (2) to form a sealing flange (20) extending from the front end of the pipe (1).device for inflating the inner tube (2) and comprising a coupling element (17) that can be connected to the pipe (1) to withstand the pressure and is provided with a connector (16) for introducing a pressure medium into the inner tube (2).