Trunk Main Rehabilitation using a Kevlar Reinforced Composite Lining System
Mark Trembath, Andreas Gross
Abstract
The paper presents a flexible Kevlar® reinforced lining solution for the trenchless rehabilitation of critical water main infrastructure. The paper will show the composition of the lining material as well as the functionality of the specifically developed termination fittings. The lining material is characterized by high material strength, accommodating the operating pressures independently from the host pipe material. At the same time, the lining material has a low wall thickness of 6 – 8 mm for PN 16, reducing the cross-sectional losses significantly comparision to sliplining with HDPE SDR 11 PN 16. Due to the flexibility of the Kevlar® reinforced lining material, bends of up to 90 degree can be traversed and thus, long installation lengths of several hundred meters in one step a feasible. The paper will address needed cleaning and equipment requirements as well as the installation process. The paper will present a case study on the rehabilitation of a DN 225 Class 9 PVC trunk water main with a length of 460 m for the Lismore City Council using the Kevlar® reinforced lining system. The Council was confronted with multiple burst on this line. The following technical goals were to be realized with the proposed rehabilitation solution: upgrade the existing Class 9 PVC pipe to PN 16 and minimize the cross-sectional losses. In addition, a scour valve had to be reinstated. The paper will conclude with the advantages and limitations of this lining system.
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