Abstract: A seamless composite metal tube comprises an inner layer (1) consisting of copper or a copper alloy, an outer layer (5) consisting of aluminium or an aluminium alloy, and at least three different intermediate intermetallic layers (2, 3, 4) each consisting of copper and aluminium, wherein the concentration of copper decreases from the inner layer (1) to the outer layer (5) in the radial direction of the tube.

Abstract: The present invention relates to a method of manufacturing a seamless multilayer composite pipe, an apparatus for manufacturing a seamless multilayer composite pipe, and a seamless multilayer composite pipe. The method of manufacturing a seamless multilayer composite pipe comprises the steps of a) providing a seamless metal pipe with at least one continuous layer covering its inner surface, and b) passing the seamless metal pipe through a unit in order to reduce the diameter of the seamless metal pipe by cold working. An apparatus for manufacturing a seamless multilayer composite pipe comprises a unit for providing a seamless metal pipe with at least one continuous layer covering its inner surface, and a unit for reducing the diameter of the seamless metal pipe by cold working.

Abstract: A seamless composite metal tube comprises an inner layer (1) consisting of copper or a copper alloy, an outer layer (5) consisting of aluminium or an aluminium alloy, and at least three different intermediate intermetallic layers (2, 3, 4) each consisting of copper and aluminium, wherein the concentration of copper decreases from the inner layer (1) to the outer layer (5) in the radial direction of the tube.

Abstract: The invention relates to a multilayer tube assembly and a method for producing the same. In particular, the present invention relates to a multilayer tube assembly, which may be used in sanitary and heating installations. The multilayer tube assembly according to the present invention comprises a seamless copper 1 tube provided on its external surface with an oxide layer 2 having a thickness of 0.1 ?m to 1 ?m; at least one intermediate 3 adhesive layer on said oxide layer 2 consisting basically of LLD-PB and containing 1 wt.-% to 2 wt.-% of an additive metal deactivator; and at least one outer polymeric layer 4 provided on said intermediate adhesive layer 3 and consisting mainly of a high-molecular polymeric material and 2 wt.-% to 4 wt.-% of an additive flame retardant.

Abstract: An insert (4) is provided for connecting standardized fittings (2) normally used for connecting standardized pipes with multilayer pipes (3). The insert (4) being slightly elastically deformable is adapted to be inserted into a fitting (2) and adapted to receive a pipe (3), wherein an outer circumferential face of the insert is substantially smooth for sealing between the fitting (2) and the insert (4) and an inner circumferential face of the insert (4) is provided with a sealing portion (4a, 4a1, 4a2) for sealing between the insert (4) and the pipe (3) and a holding portion (4d) for holding the pipe (3) in position.