PVC-O PIPE | MACHINERY
A 34km water pipeline in New Zealand is one recent example of how PVC-O pipe is becoming more prevalent in infrastructure applications
Pressure situations: advances in PVC-O
PVC-O pipe is typically used to transport water under pressure, due to its high pressure rating – and was recently chosen for a major pipeline in New Zealand. At last year’s Ozpipe event, Jay Roy, quality manager at Iplex Pipelines in New Zealand, explained how the company contributed to the Hamnak pipeline – which he said is the country’s “longest PVC-O water transmission pipeline”. The 34km line, which was installed in 2017 and
2018, uses DN200, DN150 and DN100 sized pipe to deliver drinking water to over 1300 people in the Waitaki district. However, the system is flexible enough to handle a 45% increase in demand over 40 years, he said. The previous pipeline was partially non-compli- ant with water regulations, and there were cases of E. coli contamination. In addition, there were frequent supply restrictions, and the system was subject to frequent failure. PVC-O was chosen for the majority of the pipeline because it is lighter than conventional PVC
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and PE100 pipes of similar diameters and pressure classes, so is quicker and easier to install. However, sections of the pipeline under existing waterways and roadways were installed by Horizontal Direc- tional Drilling (HDD) using PE100 pipe in sizes DN180 & DN250 with a pressure class of PN16. The contractor chose to use PVC-O in its tender submission to achieve a cost advantage in con- struction, said Roy. For instance, an open-cut installation method was specified for much of the tender, which meant no obvious benefits to using PE100 – which would be optimal for trenchless installations. Also, simple in-trench jointing of PVC-O with factory fitted composite seals helped towards fast installation: lay-rates of up to 200m per day were achieved with minimum disruption to landowners, he said. “PVC-O provided the best outcome for the
project in terms of cost-effectiveness, hydraulic- capacity and constructability – including quick reinstatement and minimal disruption to landown- ers,” said Roy.
Main image: Iplex says the 34km Hamnak project is New Zealand’s “longest PVC-O water transmis- sion pipeline”
� October 2020 | PIPE & PROFILE EXTRUSION 23
IMAGE: IPLEX PIPELINES NZ
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