Yorkshire Water asked DrainsAid to rehabilitate a sewer along the River Colne, Huddersfield, using a Hot CIPP Liner.
Tree roots had penetrated the pipe, restricted the flow and caused cracks and longitudinal fractures, allowing exfiltration which created a risk of river pollution. The pipe was in an awkward location at the bottom of a steep bank and across a river, which was difficult to access.
DrainsAid planned to erect two temporary bridges to allow our operatives and materials to easily access both manholes. Following that, we erected a scaffold tower, which was needed to hold the head of water and sufficient pressure on the new liner.
A double stitched, pre-liner was first placed in the sewer to act as a protective membrane. A 60 tonne crane was used to lift the 375mm diameter CIPP Liner up the scaffold tower and lower it down into the manhole. Over 7,000 litres of water were pumped into the line. The pressure inverted the liner, pulling it down along the sewer and into position.
Once the liner was in position, the water was circulated through a boiler to raise the temperature and begin the hot curing process. After six hours the liner had cured to form a solid, high strength pipe with a life expectancy of up to 70 years.