Circular Pipe Liners

Renewal of underground deteriorated pipelines using trenchless methods has become increasingly essential because it offers a no-dig, cost-effective and non-disruptive way of renewing the pipeline.

Circular pipe liners are used to renew sewer or drain pipelines and culverts of circular cross section.  The Interflow range of circular pipe liners  are formed by taking a continuous strip of plastic and spirally winding it inside the deteriorated host pipe, locking or welding the edges of the strip together to form a water-tight pipe within a pipe. The plastic strip or "profile" is smooth on one side and ribbed on the other. This allows it to provide a smooth liner with maximum strength-to-weight ratio. These liners are structural meaning they can be designed to take all loads, typically assuming the deteriorated host pipe has no remaining strength.

Interflow installs 3 types of spiral wound liners; Expanda, Rotaloc, and Ribline depending on pipe diameter and loading conditions. Pipe diameters from 150mm to 3000mm can be lined.