AGE REPAIR AND CARBON
resin, which is placed and inflated within the original damaged host pipe. This then produces a new pipe within the host pipe after the resin cures, meaning that the area is once more fully watertight. When the damage is even more severe, and a pipe has collapsed or become otherwise deformed, it can be re-rounded by a special tool which is mechanically drawn through the pipe, expanding the pipe back to its original shape as it progresses. Once the correct shape has been reinstated, a CIPP lining is then inserted and, using water pressure or air, applied to the inside of the old pipe, providing a permanent repair. Where the affected area is more localised, a patch repair is often more appropriate. The patch, which we prepare on site to match the size of the specific area in question, consists of a glass fibre mat impregnated with resin which has a time delay catalyst. The patch is then wrapped around an inflatable pipe packer which is used to transport the patch from above ground to the affected area.
Nick Reilly, Business Development Director, UKDN-Waterflow
Once we have used a CCTV camera to check that everything is properly aligned, we then position the packer within the pipe in order to ensure that the patch adequately covers and repairs the broken section.
The packer is then inflated with air, which applies pressure against the patch on the pipe wall in order to bond it in place. In this way, the patch is held in position until the resin has cured and it is effectively glued against the wall. Only then is the packer deflated and removed, leaving the watertight patch in place over the damaged section and the pipe back in full working order.
BOTTOM LINE The carbon savings generated by
using no-dig technology are undoubtedly impressive, but the benefits of the method do not end there. Perhaps most significantly, it can save organisations significant amounts of
money – the reduced labour and energy costs for no dig techniques means that a cost saving of up to 75 per cent is achievable. Moreover, because there is no need for invasive action the risk to assets is enormously reduced. It is also far less disruptive
operationally. Noise levels are greatly reduced compared to excavation work, and there will be no need to reinstate flowerbeds, paving or even roads afterwards.
Of course, in some situations, excavation is unavoidable, but a good drainage engineer will seek to minimise disruption for their customers, and will always explore all options before concluding that digging up the area to get to the pipe is the only possible solution Undoubtedly, where practical, a no-dig solution will have the best outcome not only for the customer, but for the environment, too.
www.waterflow.co.uk
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www.solarpowerukevents.orgPUBLIC SECTOR SUSTAINABILITY • VOLUME 2 ISSUE 4 17
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