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Denso Tape Protection at Cambridge Pumping Station

Posted: Friday 3rd October 2014

The pumping station at Kennet on the Cambridge/Suffolk border performs a key function on the Environmental Agency’s major Ely Ouse to Essex Water Transfer system which takes raw water from Blackdyke in Norfolk to Great Sampford in Essex. Design consultants for a project to refurbish the pipeline part of the system were Black & Veatch Ltd.

The construction of this project was carried out by main contractors Jackson Civil Engineering for refurbishment of the anode bed of the cathodic protection system for the main pipework, with specialist sub-contractor Cathodic Protection Co Ltd of Grantham. During works at Kennett PS it was observed that two VJ couplings and associated pipework within a chamber were suffering from surface corrosion due to deterioration of the original protection system.

Sub-contractors Jack Tighe Ltd wire brushed all chamber pipe and coupling surfaces and ensured they were dry and free from contaminants. In this project, after stabilising the surface with a paint primer, Winn & Coales (Denso) Ltd’s conventional protection system was then applied, starting with Denso Paste and then application of Denso Mastic on bolt heads, nuts, flanges and other projections to give an overall smooth external profile. This was then wrapped with Denso Tape in a spiral wrap using 55% overlap. The tape extended along 150mm of the protected barrel of the pipe on each side of the joint and fittings.

In a report to the Environment Agency Black & Veatch stated: “The works were carried out to a high standard.”

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