NDDS Services

Sewer Renovation

Before deciding on the best renovation solution for a given drain or sewer, our CCTV engineers use sophisticated, remotely-controlled camera units to survey the pipe. This is an integral part of the sewer renovation service, and allows us to prepare a report detailing the nature of the problem, and the remedial action we recommend to effect full sewer rehabilitation. In larger diameter pipes, we may carry out man-entry surveys with personnel trained in confined space working.

Renovation by relining

Wherever possible, our sewer renovation specialists use relining also known as ‘no-dig’ or ‘trenchless’ technology — to rehabilitate sewers and drains ranging from 225mm to 2500mm in diameter. For localised repairs to specific sections of drain, we may use a technique known as patching which is suitable for pipes with diameters from 100mm up to 1250mm.


Once the project is underway, our expert team will manage the process right through from design stage to standards approved and certified by PDL (Pipeline Development Limited).d with minimum disruCCTV Drain Survey

NDDS advanced drain CCTV survey technology is the best and most cost effective way to inspect drains and sewers. If you already have a drainage problem or are just keen to avoid one in the future, a  NDDS CCTV drain or sewer survey is a quick and accurate way to get an instant, detailed look at the condition of your underground drains.

We use remotely-controlled, specialist camera systems and software to carry out a CCTV drains survey. These drain inspection cameras relay images to a mobile van unit, so that a technician can assess the structural condition and integrity of the drain or sewer. And, there’s absolutely no disruption to your property or the environment — it’s simple.

The technology isn’t simple though. In fact, it’s the world’s most sophisticated CCTV survey equipment. Our camera units allow us to get the best results from any CCTV drain or sewer survey and the specialist software means that you see the results for yourself on DVD, all supported by a full technical report.ption to the area and the environment.

Pitch Fibre Pipes

Pitch Fibre Pipes were popular between the 1950’s until 1970’s as they were cheaper than their clay options. these pipes have a life expectancy of 30-40 years. Most have now reached their life end they are causing problems.

Rigid Liners are used to repair clay pipe work within the sewage industry and are designed and tested to last for 50years, the same Liners can be used provide a solution to pitch-fibre pipe problemsTrenchless explained

‘Trenchless’, ‘no-dig’ or ‘relining’ is simply the fastest and most cost-effective way to repair a damaged drain or sewer, and causes the least disruption. As a result, it is also considered to be the most environmentally and financially favourable solution. Also known as CIPP (Cured-In-Place Pipe), it is the established form of repair for dilapidated infrastructure assets. The technique involves inserting a liner impregnated with a special resin into the sewer or drain. As the liner is inserted into the pipe, it is turned inside out and forced through using water or air pressure. The material then bonds to the inside of the pipe and the resin cures or hardens, effectively creating a new pipe within the pipe and restoring the integrity of the drain or sewer.


Each lining project is a bespoke design. Decisions about the type of liner, resin, curing method and re-opening works are planned meticulously according to the specific criteria involved: diameter, length, type of pipe, overpumping requirements, access points, condition of drain, timescales, working area, cost, etc.

From big to small

Trenchless sewer replacement can be carried out on pipes from just 100mm diameter up to 2.5-metre culverts and, depending on access and logistical considerations, in single lengths or in a series of shorter, overlapping liners. These patch liners can be installed in pipes as small as 100mm diameter or as big as 1.2 metres.

Full relines

When renovating a full length of sewer by trenchless methods, the lining material is a concentric composite felt tube. Each one is commissioned individually for its project and delivered to our production facility, where the outer skin is manually impregnated using a specified resin. Once the liner has been installed (by inversion) into the pipe, the resin is cured either by heat (hot water or steam) or by ambient temperatures. That done, robotic cutting equipment is employed to open up any lateral connections before the pipe is re-commissioned.

And the very latest in trenchless technology: Ultra Violet

NDDS UV liner is an innovative and bespoke fibre-glass product and installation technique. It’s fast: using UV (ultra violet) light, the lining will cure in less than 1-metre per minute.  And it’s durable: once cured the UV lining has a design life of 120 years.


Spot or patch liners are the perfect solution to localised cracks, fractures, root ingress, open or displaced joints or holes. These liners are generally made from a fibre-glass matrix and positioned using an inflatable packer. It’s a quick and cost-effective way to repair smaller, troublesome areas which could, potentially, become major issues if left untreated.

Built to last

Our lining material is tested for 1,000 hours to ensure the material exceeds WRc criteria. It provides a 50-year design life with a safety factor of <2, effectively giving one hundred years’ life expectancy. Installations are tested and verified by PDL (Pipeline Developments Limited).

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