The repair of a leaking underground water main which had proven impossible to fix for 15 years before SylWrap came up with a solution

400mm Steel Water Main Live Leak Repair

A solution was needed for a 400mm carbon steel underground leaking water main repair in the United Kingdom which had been leaking for 15 years without a suitable fix being found.


There were two reasons why the water main had been allowed to continue leaking for 15 years. The first was because it was impossible to stop water flowing through the main so that a repair could be carried out.

The second was that carrying out a repair was extremely difficult due to the location of the water main, which was underground with extremely limited access. As a result, a live leak repair that could be performed in a tight space was required in order to reduce the amount of water being lost until a new water main could be installed.


It was decided that the best way to attempt to seal the leak would be by double wrapping from the flange up the tapered pipe. Given the difficult nature of the repair, a significant number of Wrap & Seal Pipe Burst Tapes were delivered along with SylWrap Pipe Repair Bandages.

The theory behind applying more than the recommended amount of Wrap & Seal was that because of the access issues, there may not have been the required room to stretch the Pipe Repair Tape to its full length. It soon became clear though the Wrap & Seal was effective despite the tight constraints of the working space, sealing the leak.

The leaking water main repair was completed with an overwrap of SylWrap Pipe Bandage which set rock-hard and provided a permanent, impact resistant layer over the repair.


In less than an hour, a SylWrap Universal Pipe Repair Kit repaired a water main that had been leaking for the previous 15 years. It was a low-cost fix to a problem that up until this point, no other company had been unable to resolve.


The contractor who carried out the repair was extremely happy with the products, the solution and technical advice offered by the Sylmasta team.

“The product was a success as I knew it would be and the information that you provided greatly supported the project and more importantly, future projects.”

For contractors who may need to carry out regular repairs of water mains and other pipework, we now offer a SylWrap Pipe Repair Contractor Case which contains enough products to carry out several live leak repairs even when pressure cannot be turned off.

Repair Photos

Products Used

SylWrap Pipe Repair Bandages are water-activated and set rock hard in minutes, helping to strengthen and repair damaged and leaking pipework
SylWrap Pipe Repair Bandages
SylWrap Pipe Repair Bandages are water-activated fibreglass bandages which set rock hard in minutes to reinforce, refurbish and help to repair damaged and leaking pipes.
Wrap & Seal Pipe Burst Tape is a pipe repair tape that stretches to 300% to fix leaking pipes even when pressure cannot be turned off
Wrap & Seal Pipe Burst Tape
Wrap & Seal Pipe Burst Tape is a self fusing pipe repair tape which fixes leaking pipes even when water flow cannot be turned off.
SylWrap Pipe Repair Contractor Cases contain all the equipment and products needed to carry out multiple pipe repairs to live leaks
SylWrap Pipe Repair Contractor Case
The SylWrap Pipe Repair Contractor Case contains enough products and equipment to carry out multiple live leak pipe repairs, making it ideal for regular users.
The SylWrap Universal Pipe Repair Kit carries out live leak pipe repair, allowing for repairs to be carried out even water flow cannot be stopped
SylWrap Universal Pipe Repair Kit
The SylWrap Universal Pipe Repair Kit can carry out a permanent live leak pipe repair quickly and easily and without the need for any training.

If you have an application you would like to enquire about, then please get in touch

Call: +44 (0)1444 831 459