The use of plastics pipes in potable water supply applications has been growing rapidly. Both PVC and Polyethylene pipe have major advantages over competitive materials and as polymer technology keeps improving the choice of plastics pipes for water supply infrastructure projects keeps increasing.
Plastics pipes have design life in excess of 100 years during which they provide excellent performance and trouble free service life. They are corrosion resistant and because of their relatively light weight are easy to handle, transport and install.
Plastics pipes are flexible and fatigue resistant and can withstand repetitive pressure surges. Plastics pipes provide a smooth biological growth free bore through the life of the product eliminating flow restrictions common to other materials.
Australia’s largest PE sewerage line. SA Water early in 2007 commissioned what is so far the largest diameter PE sewerage lining project yet undertaken in Australia. B.J. Jarrad P/L was the prime contractor, Sydney based CLM Trenchless looked after the sewerage lining and Iplex Pipelines supplied the PN12.5, DN630, PE100 pipe.
The remote Koonibba Community in South Australia is enjoying a reliable water supply delivered from Ceduna by a new 70km pipeline of Vinidex PVC pressure pipe. Oriented-PVC pipe is manufactured by altering the molecular structure of PVC to give the product greater strength, allowing thinner pipe walls and greater water carrying capacity.
The new line, comprising mostly 200mm and 150mm Series 2 PVC and OPVC pressure pipes, begins at Ceduna, replacing a 2 inch pipeline that was unable to deliver sufficient water to meet the needs of the community. There are two pumping stations, one at Denial Bay and one at the off-take to Koonibba. Water is stored in a 450 kilolitre tank on a hill at Koonibba then gravity-fed to the settlement. Another 450 kilolitre tank is located to the west of Koonibba at Bill Hill.
Manufacturing and delivering a 10km pipeline for New Zealand’s Stratford Power Project required precise logistics and international coordination. Vinidex supplied almost 10 kilometres of precision manufactured 450mm high density polyethylene pipe to New Zealand to deliver water to the new gas-fired power station from the Patea River, 10km east of the power plant at Stratford.
The 450mm (outside diameter) pipeline was manufactured in Australia. When commissioned, the pipeline will deliver a constant, controllable flow of pumped water at a flow rate of 140 L/s and in pressure ratings of PN18, PN12 and PN9 in three stepped-down stages of 4100m, 2050m and 3500m. Jointing of the pipeline was by on site butt welding technology to provide a permanent homogeneous joint. The pipe was butt welded above ground in a continuous line, before sections were laid in a two metre deep trench. The trench took a direct line from the water source at the Patea River to the project site, through 10 kilometres of undulating open farmland.
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