Two significant technical challenges had to be overcome in order to deliver a successful solution for this project; the development of a large diameter structural liner and a method to install exceptionally long, continuous liners between existing access chambers.

SPR^®PE technology, incorporating the Ribline^® spirally wound system by RIB LOC^®, is a unique steel reinforced spirally wound high density polyethylene liner with a high strength to weight ratio. This makes it possible to renew large diameter pipes cost-effectively. 

Liners are produced using a fixed machine positioned within existing access chambers. Given the unique requirements of this project, an innovative technique was developed to aid in the installation of extraordinarily long continuous liners. All liners were installed with live flow running constantly as the sewer had to remain in operation at all times.

Within this project SEKISUI Rib Loc Australia and Interflow safely delivered the world’s longest and largest continuous spirally wound liner. The liner was 706 m (2316 ft) long, 2400 mm (100 inch) in diameter and weighed 120 tons (265,000 lbs).

This partnership successfully provided the client with a solution to a challenging problem and in doing so has extended the boundaries of trenchless large diameter pipeline rehabilitation beyond the limits of what was previously considered possible.