A gas-fired power plant in the UK has received a drainage system upgrade while operational, according to engineering firm the Lanes Group, which carried out the works.

The firm’s drainage engineers used no-dig pipe lining technology to upgrade the surface water and foul drains at the 350 MW Corby combined-cycle power plant in Northamptonshire, England.

According to Lanes, the damage included pipe cracking, partially collapsed pipes and joint displacements.

Eleven pipe liners were installed, and 40 local structural point repairs were carried out across the plant’s drainage system, which is largely comprised of clay pipes ranging from 150-600 mm in diameter.

The firm carried out point lining, an ambient cure-in-place pipe (CIPP) lining technique that involves installing a resin-impregnated glass-fibre liner inside a damaged section of pipe, where it is inflated and then hardens to create a new pipe-within-a-pipe. Hot water CIPP was used to harden the liners.

Lanes’ lining and renovation division also installed liners where there were sections of pipe with more extensive damage, the longest of which was 56 metres.

The work was part of a planned preventative maintain programme required by plant owner ESB, Ireland’s state-owned utility.

Lanes said it carried out a CCTV drainage survey of the site in May, delivering a report that allowed the plant operator to programme in remedial work.

Chris Batey, regional manager for Lanes Derby, said his firm had “created a spreadsheet of all the remedial work, along with locations, so we could schedule it in the most efficient way.

“We kept a jet vac tanker on site all week, while also deploying a CCTV drainage survey crew, working alongside two lining teams from Manchester.

“With careful planning we could share resources optimally between the teams, and complete the programme within 10 days.”

And Rob Heward, mechanical maintenance co-ordinator at the plant, said Lanes “were able to complete the work with no disruption to our processes, which was very helpful”.