DOUBLE-WALL PIPE WITH A HEAT INSULATING LAYER AND A PLASTIC OUTER PIPE THEREOF

摘要

A double-wall pipe includes a media-conveying inner tube, and a multilayer plastics outer tube with a gas permeation barrier layer. The plastics outer tube includes a significant proportion of polyethylene (PE). The gas permeation barrier layer consists of a compact extruded polyethylene terephthalate (PET) layer having a material thickness of from 0.8 mm to 2 mm or comprises a closed-cell foam made from PET having a material thickness of between 10 mm and 100 mm. A heat insulating layer is arranged in an annular gap between the inner tube and the plastics outer tube.

主权项

1. A double-wall pipe comprising:
a media-conveying inner tube, a multilayer plastics outer tube with a gas permeation barrier layer, the plastics outer tube comprising a significant proportion of polyethylene (PE), the gas permeation barrier layer consisting of a compact extruded polyethylene terephthalate (PET) layer having a material thickness of from 0.8 mm to 2 mm or comprising a closed-cell foam made from PET having a material thickness of between 10 mm and 100 mm, and a heat insulating layer arranged in an annular gap between the inner tube and the plastics outer tube.