The Spiral Wound lining technology is being employed successfully all over the world for the rehabilitation of challenging circular and custom shapes and is proving its reliability even under extreme conditions. This trenchless technology is based on the principle of spiral winding an extruded plastic profile from PVC or HDPE into a liner. The profiles with high ring stiffness and low weight can be steel-reinforced if needed.

Directly in the host pipe the single profile strips will be joined together by using a special winding machine and will form a liner. Depending on the system, the host pipe will be rehabilitated with a close fit liner or a liner with a backfilling of a high performance grout. The result is a loadbearing, homogeneous and watertight pipe system.

The spiral wound lining method is applicable for extraordinary large diameter and/ or unique shaped pipelines. Installation can be carried out without excavation and without interrupting the flow in the line, so that in most cases, there is no need for bypass pumping.