Connection of double tubes with internally located conduit tube

摘要

A welding sleeve is placed around each of the ends of the cover tube and has a number of heating wires. A shrink tube is pushed on, covering the intermediate space, and is shrunk. the ends of the cover tube and the shrink tube are welded to one another by heating the welding sleeve. The hollow space surrounded by the shrink tube is filled with a heat-insulating foam material and the filling aperture is closed. This filling aperture (12) is provided between the ends of the welding sleeve (7), arranged around the cover tube (3), where there is an intermediate space (9).