In the news:
|Story and photos from Kapi-Mana News 8 July 2014 pg 39.|
|Story from Whitby Newsbrief August 2014 pg 11.|
|PCC first to use pipe renewal technology. Whitby Newsbrief, October 2013 pg 13.
Porirua City Council is the first council in New Zealand to use a state-of-the-art structural lining system to upgrade the city's aging pipes. The process involves relining old mains pipes with an internal structural liner that results in a high quality structural pipe inside the older pipe.
Much of the infrastructure was laid 60 years ago when Porirua was a little town.
"It's very different today and we need to think outside the square if we're to renew our infrastructure at reasonable cost and without too much disruption to residents and motorists," said Mayor Nick Leggett. "By using this technology our council can do a lot more, for less money, more quickly and with fewer disruptions and in the end we have a high quality renewed water infrastructure."
The council has been renewing the original water main that was laid in the 1950's from Arawhata Street on the eastern side of SH1 to Kenepuru Drive on the western side. The water main goes underneath SH1, the railway lines, the stop banks and the Porirua Stream. It comes out onto Kenepuru Drive where it helps feed the western side of the city.
"The internal relining of pipes has been used extensively throughout Europe and North America as one of the most acceptable and economical forms of water main renewals," said PCC Water and Drainage Engineer Desmond Scrimgeour.
"The conventional methods of 'dig and lay' are fast becoming redundant. There are ever increasing costs and long delays associated with the consents processes, cutting up of roads and carriageways, locating or possibly hitting other utilities, traffic and site management, and general disruption of services due to the time it takes to complete such projects," he said.
The benefits of internally relining old mains with a structural liner include savings in costs of up to 40 per cent cheaper than traditional methods; minimal requirements and costs associated with resource consents; no traffic management and disruption; less excavation; better use of existing infrastructure rather than having "abandoned" pipes; fewer disruptions to residents and commuters during work period; shorter work time; easier access; increased pressure and flow capacity; corrosion resistant, and no future maintenance required.