Australian Water Management Review Vol 2 2013 | Page 50

After a thorough review, ITS submitted an alternative tender to the original CIPP lining request, which was to slipline the existing pipelines with polyethylene pipe and grout fill the annulus. This alternative solution met all the design criteria with the added bonus of saving the client several hundred thousand when compared to CIPP lining cost. Following a successful tender proposal, NBWB engaged ITS to deliver the alternative option and work began on procuring materials and planning the installation for what was a very limited window of opportunity. The pipeline included several changes in both vertical and horizontal alignment and the scope of works included design and construction of access where the steel pipelines joined the existing concrete pipes from the pumps, removal and replacement of steel flaps at discharge end headwall, modification and reinstatement of existing stilling basins at discharge end, installation of rock mattress at the exposed end connection tapers and reinstatement of Sheep Station Creek batter. Works commenced on schedule and the 165 m installation went according to program and without incident. Excavations were used to gain access to the pipe at the low points at each end and the high point in the middle of the pipeline to inject the high flowing cementitous grout and stabilise the polyethylene. ITS also managed the groundwater during the works, which ensured protection of the creek quality and local flora and fauna. ITS successfully completed all works to the Rocks Pump Station rising mains without incident, under budget and three days ahead of schedule. The sliplining of the existing rising mains was the final phase associated with rejuvenating the existing pump station and NBWB have since reported a 30 per cent drop in power costs associated with pumping since the project was completed.

Cure for Oviform in Sydney
To provide a solution to the rehabilitation of very old, deep and large oviform stormwater and sewer pipes across Sydney, Kembla Watertech looked to the international experts. Kembla Watertech states the company now has one of the largest ranges of cured-in-place pipelining ( 4??&V?FVBFV6?????w???W7G&??F??2??6?VFW2G&F?F????V?f?&???W"4??Ub7W&VB4???B&V??f?&6VBf?'&Vv?724???V?&?vFW'FV6??Wr6?WF?v?W2F?f?6?????vW"??R????6RW????2F?R&W6V&6??BFWfV???V?B&?6W72?( ?vR??F????V?V?BF?R&?v?BFV6?????w?f?"F?R&?v?B??"?vRF???B?ffW"??R6??Rf?G2??&?6?F?????r???7FVB??W"&??V7B7Ffb????BF?R&W7B6??WF???f?"F?R??"?( ?vR6?F?F?Bv?F???R?bF?R?&vW7B&?vW2?b????rFV6?????w???W7G&?F?B?2&VV?Gf?6VBF?&?Vv??V'2?b&W6V&6??BFWfV???V?B?( ?( ?F?W&R&R?77VW2v?F?&V?&??FF??r?f?f?&??W2???V?&V6W6RF?W?&RV?FW&?VF???v???V?FVB&V2??BfW'?FVWV?FW&w&?V?B???vWfW"??W?&V?Vf?BF?W6??r4?f?"&V?&??FF????2F?BWfV??bF?R??7B?R?26?v?F?FVf?&?VB?F?R4?v???f?&?F?F?R&?f??R?bF?R?R??BF?R???rFW&?W&f?&??6R?2??B6??&??6VB?( ?&??&?G?f?"?V?&?vFW'FV6?v???R6??GV7F??r??v??&?6????v???7Bv?&??2F?????6R??6???V??G??BV?f?&???V?F???7G2??V?&?&??V7B??vW"??W&?v??F??6?B( ?4?????r?2vV?W&????6??F??V?W2F??B??v?B6??gB??"F??RB??v?B&V6W6R?bG&ff?2&W7G&?7F???2??W"&??V7BFV?????6W2F?R???6R??7G2??F?R??6?6???V??G?'????V?V?F??r6?W7F?2&'&?W'2&?V?B???7?WV??V?BF??V???6?&W6?FV?G2vWBv??B??v?N( ?26?VW?( ???R&VG?F?&RV??VB???v?&?W'2???6?FR?CB?W7G&??vFW"??vR?R?B&Rb?Rp???