Brugg Rohr Ag Holding

Roberto Rudi

Christian Dambowy

Alfred Oeschger

Robert Schneider

Roland Demuth

Anja Boli

The invention relates to a corrugated, thermally insulated conduit for fluids, e.g. for district heating networks, wherein at least one medium pipe () made of plastic or metal is surrounded by a thermal insulation layer (), consisting of a polyurethane foam for example. The corrugation () of the outer jacket () made of plastic is formed such that both the corrugation valleys () and the corrugation peaks () are round, particularly circular. In addition, the corrugation is dimensioned such that the corrugation depth T lies in a range of 4.5 mm to 8 mm for a conduit outer diameter range of 63 mm to 202 mm. This shaping and dimensioning of the conduit results in very good flexibility and thus the ability to roll up the pipe for the transport thereof.

Thermally insulated corrugated conduit

A flexible heat-insulated conduit is described, made up of at least one medium-carrying internal tube, an external tube surrounding the at least one internal tube, and a heat-insulating layer based on polyurethane foam or polyisocyanurate foam and located between the at least one internal tube and the external tube, in which 0.1 to 7.5% by weight of hollow spheres are added into the foam, the hollow spheres comprising a casing made of a thermoplastic and being filled with a medium that brings about an inflation of the casing at an elevated temperature.

Flexible heat-insulated conduit and method of making same

A jacket () for flexible heat-insulated conduits, in particular district heat transport lines, comprising a foamed or inflated polyethylene-based thermoplastic with a modulus of elasticity between 90 and 300 MPa and a density between 0.560 and 0.850 g/cm.

Jacket for heat-insulated conduits and method for making same

A heat-insulated conduit having at least one internal tube (), a heat-insulating layer (), an intermediate layer (), a film () and a corrugated external tube ().

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Schinznach-Dorf, Switzerland

Roberto Rudi