Serving parts of North West London and the Home Counties.

Cathodic Protection Surveys and leakage

As part of our commitment to reducing customer bills, we're targeting water lost through leakage. This has been highlighted as a key area where we can make savings. 

To help reduce leakage through corrosion related bursts on our largest pipes, we are undertaking a large inspection project affecting 88km of pipes across our supply area. Part of this project will involve a survey into the current Cathodic Protection systems on trunk mains. This will be happening from September to November 2014.

 

What does the work involve?

 

The survey involves inserting 4 ground pegs (similar to tent pegs) into the soil and taking soil corrosivity readings. We then connect onto valve stems on our network to test the difference in electrical potential between pipe and soil. The current phase of surveys is for information gathering and we will not be carrying any remedial work at this stage.

 

  • The work will be carried out on our behalf by our contractor, BAC,
  • It will not affect water supplies
  • We will not be excavating and
  • No-one will need access to your home or premises, we may, however, need access to land to carry out the survey.

You can find out more about soil corrosion by clicking on this link Soil corrosion and Cathodic Protection

Where are you working?

We'll be surveying a lot of our network and moving from area to area, so it's not easy to give exact details but the following areas will be part of the programme:

  • YIEWSLEY, PERIVALE, ICKENHAM, HARROW 
  • DENHAM GREEN, UXBRIDGE, YIEWSLEY
  • BISHOP'S STORTFORD, FELTHAM, NORTHOLT, OTTERSHAW, PERIVALE, STANSTED MOUNTFITCHET, WINDLESHAM
  • HARLOW
  • BALDOCK, HITCHIN, STEVENAGE, LETCHWORTH; HOUGHTON REGIS, LUTON.

Click on the map below to enlarge (opens in a new window). The red line shows the areas where we are working.