Envirotec

Patch lining succeeds where stopper’s come up short

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Engineers preparing a local structural repair, or patch liner. The liner is pushed against the pipe with a rubber, inflatable packer.

LANES Group has used a no-dig patch lining technique to support the decommissioning of drainage pipes on a production site of leading global manufacturer Kimberly-Clark.

The Lanes engineers based at the company’s Chester depot used local structural repairs, known as patch liners, to block lateral pipes at Kimberly-Clark’s paper mills in Flint, North Wales.
The liners are most commonly used to repair sewer pipes. In this case, they were used to seal the lateral pipes. Kimberly-Clark then backfilled the redundant pipes with liquid grout.
Lanes Group is the largest independent drainage, utility and underground pipe specialist in the UK, operating from 23 offices and services hubs across the country.
Gavin Davidson, Area Development Manager for Lanes Chester, said: “Patching over redundant pipes in this way was by far the best solution.
“A conventional way to close off pipes is to put a stopper in them and backfill with concrete, but this has some serious drawbacks and risks.
“Stoppers can perish, and the concrete poured in behind can settle and may not adhere well to clay or plastic pipes, which results in gaps, allowing water leakage.
“In this case, some of the lateral pipes were 4.5 metres underground as the main storm water culvert ran under an embankment, so it would have been difficult to place a stopper.
“The patch liner creates a permanent, secure, leak-proof seal. The liquid grout then stabilises the disused pipe so it can’t collapse and affect future development. It’s a very robust long-term solution.”
In total, 14 lateral pipes, ranging in diameter from 150mm to 450mm, were sealed with patch liners, along a 500 metre section of culvert.
The method uses a technique called cure in place pipeline (CIPP) repair. A flexible fibre glass sleeve, impregnated with resin is placed in position, then an inflatable packer is used to push it against the pipe wall while the resin cures, creating a new impervious inner pipe wall.
Robot CCTV HD video cameras were used to survey the pipe before and after the patch liner was installed.

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