HDPE-Pipes with protective coating Multilayer Systems Yield New Possibilities

摘要

Using a number of examples, multilayer pipe systems have been presented that correspond to the following structure: 1. A core through which the medium flows 1.1 A contact layer between the medium and the pipe wall e.g.1.1.1 Frictional reduction for fibreglass safety pipes 1.1.2 Light reflection for the use of mobile cameras in sewer pipes. 1.2 An inner protective coating e.g.1.2.1 Corrosion resistance against aggressive media 1.2.2 Abrasion resistance against the transport of solids 1.2.3 Protection against high-pressure rinsing. 1.3 A sealing layer for the medium e.g. 1.3.1 Convection barrier suitable for drinking water applications 1.3.2 Diffusion barrier for petroleum or gas. 1.4 An initial load-bearing layer e.g.1.4.1 With special properties to prevent crack propagation 1.4. A layer to increase the pipe wall thickness e.g. 1.4.1 Rises 1.4.2 Foam-filled material 1.4.3 Solid-filled material. 1.5 A second load-bearing layer e.g.1.5.1 Imparted with special stability properties through Kevlar. 1.6 A functional layer e.g.1.6.1 For localisation of a buried pipe 1.6.2 For monitoring the pipe for damage and leakage. 1.7 A sealing layer against the surrounding soil e.g. 1.7.1 To prevent the ingress of roots 1.7.2 Against the diffusion of contaminants into drinking water pipes 1.7.3 Against electrical interference 1.7.4 Thermal insulation. 1.8 An outer protective coating e.g.1.8.1 Outer corrosion resistance 1.8.2 Protection against external damage. 1.9 A contact layer between the medium and the surrounding soil e.g.1.9.1 Reduction of friction during installation 1.9.2 Adaptation to specific geometries. 2. The actual soil surrounding the pipe. Today, a maximum of six such layers are usually used in one pipe system simultaneously. However, a combination of various layers is possible. As plastic pipes are continuously manufactured in endless fashion, extensive production facilities will be required.