PVC is ideally suited for telecommunication and power conduits due to its high impact strength, smooth internal bore and large range of diameters. Flexibility and corrosion resistance characteristics of PVC conduits makes them ideal for a wide range of installation conditions.
High density polyethylene (HDPE) is ideal for pipe lining and cable encasing, which makes it perfect for communications cables. Although polypropylene pipes are used mainly for plumbing and sewerage applications, they can also be effectively used as conduits.
Sydney Airport: Under the surface of the runway is more than 50km of Vinidex electrical conduit. The majority of this ducting was left open for future use to avoid tearing up the runway when the need for cabling arises. Carrying four or five different cables, the maze of conduit links, power sub-stations and lighting and telecommunications equipment used to aid aircraft takeoff and landing.
Two types of ducting were required by the Federal Airports Corporation - reinforced concrete encased ducts for cables under the runway and taxiways, and direct buried ducts where four to six pipes are put together and buried in the sand off the runway pavements. Hornibrook - Dredco Runway Consortium used a range of Vinidex electrical pipes and fittings, including custom fittings fabricated for specific installation needs. 20km of 50mm and 100mm class 12 ducting and 100mm HD conduit were supplied, along with the 30km of 100mm Corflo double-wall PVC pipe.
Remote Mine Hydro: As one of Papua New Guinea’s most inaccessible mining operations, the Tolukuma gold and silver mine presents a truly unique logistics challenge. To overcome the high cost of electricity generation, Dome Resources NL embarked on the development of a 2.0 Megawatt hydroelectric power station adjacent to the mine site. One area in which the company was able to make significant transport savings was in the selection of pipe materials for the hydro plant’s headrace pipeline from the nearby Auga River. The construction of the hydro plant required a purpose-built diversion, with the headrace pipeline located on the steep hillside using HOBAS GRP (Glass Reinforced Plastic) pipes from Australian manufacturers Iplex Pipelines. Stretching a total of some 1.3 kilometres, the pipeline utilises a combination of 1000mm and 1200mm HOBAS pipes to supply the plant’s three turbines.
With the hydroelectric plant now providing the mine’s electricity requirements, both the pipeline and the plant continue to perform well, delivering substantial reductions in both operating costs and environmental impact at the Tolukuma site.
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