Page 13 - WWU Innovation Report 2019-2020

Approach
We’re always keen to learn and seek out opportunities to build on past projects other networks have completed. So, we worked with Northern Gas Networks to understand their business case, before partnering with Steve Vick International, where we staged 16 trials of the technique to evaluate its effectiveness for our network and customers.
We found ESEAL to be an efficient alternative as it remotely seals the stub end under live gas conditions. It involves opening a small access excavation away from the main road or junction where the stub end is usually located. Engineers use CCTV inside the main to remotely insert an inflatable bag into the section being abandoned, then pump in expanding foam, turning the bag into a gas-safe plug. More foam is added to
fill the rest of the pipe and completely seal the stub end.
OUR ENGINEERS AT WORK
Benefits
ESEAL is a valuable addition to our operational toolbox. It not only saves time and avoids cost compared with our previous method, it is also much less disruptive.
As the remote technique can be carried out up to 60 metres from the stub end, it reduces the need for traffic management. It is also safer for engineers as they are not working in a high-risk location.
Wales & West Utilities Innovation Report 2019/20 | 13