Abstract: A sealing inner sleeve for inserting into pipes, includes two frustoconical or substantially cylindrically bent-round sleeves formed of steel sheets, wherein the free ends of the steel sheets of the sleeves overlap in their circumferential directions and an arresting device is arranged in each of these overlapping regions and wherein the two sleeves are arranged at a distance from one another in a deformable jacket tube.

Abstract: Heat exchanger element for installation in sewage pipelines, the top side of which heat exchanger element has a heat-conducting exchange surface with heat exchanger chambers arranged on it, the heat exchanger element has in cross section a run-in gutter and run-off surfaces contiguous to the latter on both sides, and, in the region of the run-in gutter and the run-off surfaces, lines for the forward run, return run and distribution of a heat exchanger medium are arranged, the floor point of the run-in gutter, the lower region of the lines and/or the free margins of the run-off surfaces being designed as bearings for arranging the heat exchanger element in the sewage pipeline.

Abstract: A heat exchanger assembly to be introduced into a sewage pipeline includes: at least one first heat exchanger adapted to thermally contact a heat source with sewage and at least one second heat exchanger adapted to thermally contact the sewage with a heat sink. The at least one second heat exchanger is arranged along the sewage flowing direction in the sewage pipeline and spaced from the at least one first heat exchanger, as well as to a method for transporting thermal energy.

Abstract: An inside sealing sleeve 1 comprised of an expandable steel band for insertion in leaking pipes in need of repair is provided with an arresting arrangement 4 which permits very small detent steps. For this purpose, the internal band end 2 is provided with a slot 5 having two rows of teeth 8, 9, while a tensioning pinion 10, a guide pinion 11 and a locking pinion 12 are rotatably seated on the external band end 3. A tensioning spring 17 engages the pivot axle of the locking pinion 12, it keeps the locking pinion 12 in engagement with the guide pinion 11 and pushes it into the gap 21 between locking pinion 10 and guide pinion 11.

Abstract: A resilient sealing sleeve supported by a mounting cart is directed to a leakage point in pipes in order to seal them. The sealing sleeve is raised to the top of the pipe by a raising and lowering device, and widened there in the circumferential direction by a widening device provided on the mounting cart. A stopping device on the sealing sleeve holds the sleeve in its widened position for the purpose of sealing the pipe.