Abstract: A heat-exchanger for gases of greatly varying temperatures, especially for use in gas turbines, which essentially consists of a collective space, for example, of a pipe-shaped collective space for the cold gas and of a metal recuperator which is formed by a large number of preferably U-shaped pipes which are welded or brazed into the collective chamber, whereby the hotter gases flow through between the pipes of the recuperator to give off some of their heat to the compressor air flowing through these pipes; one or several protective sheet metal members are arranged within the area of the connecting places between the pipes of the recuperator and the collective chamber which protect the welded or brazed joints against the hot gases.

Abstract: A cross-current pipe heat-exchanger for gases, especially for a gas turbine installation, with at least one collective space for the heat-absorbing gas and a bundle of pipes adjoining a wall of the collective space and formed of a large number of individual pipes fastened in the wall and conductively connected with the collective space; the gas stream which gives off heat thereby flows transversely through the pipe bundle; a number of pipes in the pipe bundle arranged on the inlet side are constructed relatively thick-walled, at least within the area of their fastening in the wall; preferably these thick-walled pipes have a wall thickness of about 50 to 100% of the wall thickness of the wall portion forming the adjacent collective space.

Abstract: An exhaust gas catalyst mounting, especially for motor vehicles, which so clamps a catalyst body in an exhaust line that it is protected against exhaust gas oscillations and/or vehicle vibrations; the mounting of the catalyst body inside the exhaust line being elastic in both the radial and axial directions.