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Sewer and drainage rehabilitation

The integrity of pipework systems is constantly challenged, pipelines may crack and joints may fail as a result of; ground loading, subsidence, root infiltration, corrosion, erosion or faulty installation. Excavation to replace failed drains, sewers and chambers invariably involves deep excavations and lengthy project completion times resulting in substantial disruption to the system, its users and the local community.

Do you have a gravity pipeline (sewer, drain or wastewater) that is damaged and requires some form of remediation? OnSite can offer several solutions.

OnSite's approach to repair and remediation is always to seek solutions which minimise the need for excavation. The Company utilises a number of technologies and is constantly researching the market place for new and innovative techniques. This approach enables greater flexibility and offers the asset owners more potential solutions for any given complexity of problem encountered.

Full length lining

Cured in Place Pipe (CIPP) rehabilitation is a technique for relining 'full length' pipes (manhole to manhole) insitu'. This results in a quick, simple and cost effective 'no dig' solution to costly pipe renewal with minimal disruption.

OnSite has extensive experience in delivering effective no-dig rehabilitation solutions on a range of foul, surface and process pipelines ina broad range of working environments including utility, industrial, transport and commercial. Utilising proven technology, OnSite provides no-dig solutions which match the needs of the user whilst solving the issues of any given working environment. OnSite offers several CIPP technologies:

OnSite has also been involved in the development of a new and innovative alternative relining technique:

Patch repairs

For discrete areas of damage which do not require full length relining, OnSite also offers cured in place patch repair options for even more cost effective solutions to localised damage.

Preparatory works

In advance of any re-lining:

  • A full jetting/cleaning operation will be performed to ensure the pipe is free of silt, debris and fibrous tree roots.
    • A CCTV survey inspection using a 360° pan and tilt CCTV camera will be undertaken to assess the condition of the pipeline as well as locating and plotting lateral connections.
    • Robotic cutting will be used to accurately remove any stubborn debris, larger tree roots or any intrusions which could adversely affect the lining installation.

Post-lining works

Once cured, the following operations are completed:

  • Robotic cutting to re-open lateral connections and restore flow.
  • A final CCTV camera survey of the re-lined pipeline to ensure that:
    • Full curing has taken place and to assure the client that the liner has been correctly installed and is free of any defects.
    • Lateral connections have been re-opened cleanly and will not cause rags to collect at the point where the lateral joins the newly lined sewer.

Equipment

Our relining vehicles are purpose built and are of recent manufacture thus ensuring reliability of service to our clients. All on-board equipment is powered by vehicle mounted generators. Augmenting the relining equipment, every unit carries a wide range of essential Health & Safety equipment for safe confined space entry.

Key points

OnSite

  • Unrivalled reputation in the UK for pipeline renovation of the highest quality
  • Thousands of kilometres of linings successfully installed
  • Various technologies available to solve specific customer problems

CIPP lining

  • Can line a variety of different pipe shapes and diameters 150 - 2200mm
  • Liner materials available for a variety of applications and working environments including temperature and chemical resistance
  • Cost effective - No costly, time consuming and disruptive excavations.
  • Environmentally friendly - No intrusive excavations or damage to existing surroundings.
  • Ambient cure resins available for small diameter installations
  • Liners are individually manufactured to suit the dimensions of the pipes to be lined, the lining thickness being determined by individual design requirements.
  • Liners are designed in accordance with the Water Research Centre (WRc) Sewerage Rehabilitation and are defined as Structural Type II Linings

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