Heat-insulated pipe used in a heating system and in drinking water and effluent lines comprises an inner pipe, a heat insulating layer surrounding the inner pipe, a film surrounding the heat insulating layer and a corrugated outer pipe

摘要

Heat-insulated pipe comprises an inner pipe (1), a heat insulating layer (2) made from partially open-cell polyurethane foam having a breaking elongation of more than 15% surrounding the inner pipe, a film (4) surrounding the heat insulating layer and a corrugated outer pipe (5) made from a thermoplastic material. An elastically deformable intermediate layer (3) made from a soft plastic foam is arranged between the heat insulating layer and the film and is adhered to the film. The outer pipe has a corrugation with a corrugation depth of 5/D to 12/D and a corrugation distance of 10/D to 25/D, in which D is the outer diameter of the outer pipe.