Created by potrace 1.16, written by Peter Selinger 2001-2019

Pipe Crawler condition assessment of a reservoir transfer main

A water company client engaged WRc to undertake a condition assessment of the a reservoir raw water transfer main to understand its current condition prior to planned extension work.

More on Pipe Crawler Potable Water Crawler


a range of surveys requested by the client, including internal pipeline CCTV, NDT and soil resistivity testing to inspect asset condition and potential lifespan


a full end-to-end solution of the client's condition assessment requirements by leveraging our technology and survey partnerships


the water company client to plan remedial action to rectify defects discovered by our surveys, ensuring that safe and effective service can be resumed

A UK Water Company

This client delivers over 340 million litres of water daily via 15,000km of water mains to 800,000 homes and 70,000 businesses in a semi-rural region of the UK.


The Challenge

A water company client required a full condition assessment of an existing 7.5km 900mm Spun Iron raw water transfer main to understand its condition prior to works to extend it another 4km to an additional extraction source, which would increase the pressures in the main when in use.

The Solution

Following detailed planning by the WRc team, the client and their Tier 1 contractor, a robust inspection plan was developed which centred on the utilisation of WRc’s Long Range Potable Water Crawler system (Pipe Crawler), leveraging our partnership with NDT Group and utilising services from our sister company RSK Geosciences to provide a full end to end condition assessment solution.

By utilising the range of WRc’s Potable Water Crawler we were able to reduce the number of openings required to seven and completed all but 35m of the full length of the pipeline. Non-destructive testing (NDT) and soil resistivity testing was undertaken at each location during the installation of the under pressure tappings used for entry points.

The Outcome

The CCTV surveys found a number of a small piles of rock deposits, silt build up near a wash-out and an intrusion into the invert of the pipe from below. The NDT surveys found no signs of corrosion at any of the seven sites and the soil resistivity confirmed the pipe is laid in an aggressive soil environment.

WRc collated all the survey results together and produced a final report which concluded that the pipeline was still in excellent condition, will accommodate the additional pressure and will meet the manufacturers quoted lifespan. Following the replacement of the damaged pipe section and a flushing regime to remove the deposits and silt, the pipeline is ready to be extended and then resume service.

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Created by potrace 1.16, written by Peter Selinger 2001-2019

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