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7.9km of concrete pipe supplied for Chelmsford sewer project

The installation of just under 8km of concrete pipe at a sewer project in Chelmsford, Essex, is thought to be one of the largest projects of its kind in the UK.

Known as the Chelmsford Effluent Pipeline, the project by Essex & Suffolk Water, which is part of Northumbrian Water, has seen the installation of 7,900m of 1.4m diameter Stanton Bonna concrete pipe to upgrade the capacity of the existing outfall from Chelmsford.

The duplicate pipeline runs from the Chelmsford (Brookend) Sewage Treatment Works to Essex & Suffolk Water’s Langford Water Treatment Works. The water company wanted to increase the capacity of an existing dual pipeline that carries flows from the Chelmsford sewage treatment works to the Blackwater Estuary.

Civils and drainage solutions supplier Keyline supplied the concrete pipe for the project, while civil engineering contractor Roadbridge was tasked with laying the pipeline for the scheme. The contract involved the design, supply and installation of the underground gravity pipeline, which runs in parallel with the existing pipelines, crossing numerous roads and watercourses.

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