Articles & Case Studies

School gives lesson in new patch uses

Posted: Tuesday 9th June 2015

Two leakage repair products have been used in unusual ways to achieve a quick, cost effective fix to a defective sewer pipe at a school in Wales.

Recent alterations at the school had highlighted issues with the condition of a private foul line. Particularly, the school was left with unacceptable, foul smells at the pipe emanating from macerated fluid from a septic holding tank.

Following a detailed inspection and liaison with the Local Authority, it was agreed that the existing 150mm clay pipe should be lined with a 110mm flexible UPVC duct. It was confirmed that there would be no issue in reducing the pipe bore under the school and returning it to its full 150mm diameter at the next live chamber.

The key challenge for this particular solution was to ensure that the new ducting was properly secured to the current sewer line, with no possibility of seepage into the void between the two pipes, which could cause further issues.

Lee Davidson, Director of Elite Pipeline Services, who carried out the works, takes up the story. “We pulled the 110mm pipe through the existing 6 inch clay pipe via a disused manhole within the property and used a Pipe Doctor kit to join the 110mm pipe to the 6 inch pipe in the upstream manhole, where the waste enters. In the downstream manhole, we used the SealGuard II product to seal between the 4 inch and 6 inch pipe to great effect,” Lee explained.

Pipe Doctor is the only WRc-approved no-dig patch repair system, originally designed to refurbish broken areas of pipe. A fibre glass mat is impregnated with resin that sets to a permanent, watertight, solid area, which is guaranteed for 10 years. Pipe Doctor is available in kits for straight pipes, swept bends and lateral connections.

SealGuard II is a polyurethane grout usually injected directly into flowing water to instantly halt leaks. It expands to fill any void and cures within minutes, creating an effective seal with no time delay.

Lee commented, “We have been using the Pipe Doctor system since 2006 and always found the product easy to use, giving excellent results, but this is the first time we’ve used SealGuard II. It is fantastic, acting like waterproof expanding foam. The job was a success with no further smells!”

Advice about the products’ use for this application was also given on site to the Elite Pipelines staff by Source One Environmental employees. “The support we get from Source One Environmental is fantastic whether it be via email, phone or site visit,” Lee concluded.




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