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Leak Detection

Acoustic Detection

On occasions pipes are very well insulated or buried deep in structural materials and using a specialist acoustic listening device for detection is very helpful subject to back ground noise, when a pressurised water pipe is damaged the water leaks out into the surrounding ground which causes the pipe and surrounding material to vibrate at the exit point. By using sophisticated ground microphones we can trace and pinpoint the exact location of the leak.

Tracer Gas

This is a slightly more involved process but used daily due to its excellent results. Water is drained from the suspected system and a tracer gas is introduced under pressure to a convenient point on the system. The gas is made up of 95% nitrogen and 5% hydrogen. Hydrogen being the smallest and lightest molecule will escape from the pipe at the point of the leak and make its way to the surface (even through porous floor screeds) where it can be detected by a sensitive gas detector. The advantages of this particular mixture of gas are that it is non-flammable, non-toxic, non-corrosive and does not damage the environment in any way.



Sherborne Drainage Limited offer a comprehensive range of drainage repair services to assist with everything from repeat blocked drains to collapsed pipe work. We take great pride in providing a solution for any drain problem quickly and efficiently then undertaking the necessary repair again quickly and efficiently to minimise any disruption to the drainage service.

Sherborne Drainage undertake a thorough assessment of the problem, including CCTV investigation to ensure we understand the full extent of the damage or blockage. We will then can then continue with the most appropriate and cost effective service to fix your drains, and return them to full working order.


Our staff are street works accredited and trained in confined spaces, enabling us to work within deep excavations and sewers within the public highway. We work directly for the water authority and local authorities which ensures speedy transition from application to completed works.

Our services include:

1. Complete all applications on your behalf.
2. Obtain Highway Licences for;
3. Road opening permits.
4. Section 50 licences.
5. Road closure permits.
6. Completed works certificates.
7. Method statement and risk assessments specific to the task.
8. Traffic management including diversion plans.
9. Construction work, including;
10. Open cut traditional method.
11. Timbered heading trenchless tunnelling.
12. We take on the jobs that others won’t consider.


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