Articles & Case Studies

DrainsAid complete their largest diameter lining installation to date for Yorkshire Water

Posted: Thursday 9th April 2015

Wakefield based sewer and drain rehabilitation specialists DrainsAid recently completed their largest diameter lining installation to date for Yorkshire Water.

Working on behalf of long-established partner Yorkshire Water and as part of the Yorkshire Water Pollution Prevention Project, DrainsAid were tasked to find a solution for the rehabilitation of a sewer at a woodland area of Heathfield Grove in Bradford, Yorkshire.

The 700mm U shaped brick sewer in Bradford had begun to deteriorate which led to several tree root intrusions throughout the pipe.

Following a CCTV survey, Yorkshire Water identified that the roots could potentially lead to a blockage within the sewer, which if not treated correctly, could create potential for pollution to escape to the nearby woodland area. Always quick to respond to any potential problems, Yorkshire Water contacted DrainsAid to find a fast and effective solution.

Fast, effective solution

“As the problem was located in a heavily wooded area, access to the site was limited, and there was no access to the downstream manhole other than by walking,” explained Ben McCluskey, Project Manager at DrainsAid.

“To combat this, we utilised a nearby road and built a bespoke scaffolding platform over a retaining wall to create an access point to the sewer.”

Using their experience and expert knowledge of sewer renovation, DrainsAid decided that the best solution to the problem would be to completely reline the full length of the sewer to prevent any further root infestations and to protect the sewer from any further long term damage.

Before the DrainsAid team could reline the sewer, they had to remove the roots that were currently intruding into the drainage system. Using a Hachler Robotic cutter which is capable of cutting in, up to 1 Meter Diameter pipes, the team were able to remove the roots, and use a JHL Recycling Jetvac Unit in conjunction with a remote reel jetting hose to clean the sewer. This removed all debris and cleared the sewer ready to be relined.

Due to the length and size of the sewer, DrainsAid used a 700mm Hot Cured , CIPP internal pipe liner, which was lifted into position by a crane and inverted through the access point created by the scaffolding platform.

Using a CIPP Lining meant that the work could be performed with the least disruption to roads and the local area. DrainsAid inverted a 246m x 700mm CIPP liner into the damaged pipe through the manhole. Through carrying out the lining DrainsAid applied a Hot Cure solution to fully reline the sewer, preventing any further root ingress.


By using the Hot Cure CIPP Liner, the full sewer length has now been rehabilitated through one continuous installation and root infestation has been removed and will be prevented in the future. The liner provides continuous cover throughout the pipe from manhole to manhole, meaning that no roots can penetrate the system.

“Due to the restrictions put on the area from the highways authority, we had a limited amount of time to complete the project, and worked quickly to ensure roads were not disrupted,” Ben McCluskey continued.

“The DrainsAid team worked tirelessly to ensure that the project was completed on time and to the highest standard. The team deserve praise for the quality and speed of the challenging - though successful - installation process, due to the unusually large diameter of the sewer and limited site access. This was our largest ever relining project and the sewer is now durable and protected against deterioration.”

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