Articles & Case Studies

Denso Protection System for Hereford Water Pipeline

Posted: Tuesday 21st August 2018

Lewis Civil Engineering is currently constructing an 8km length water main pipeline in Hereford for Dŵr Cymru Welsh Water.

Winn & Coales (Denso) Ltd were contacted for information on the most suitable anti-corrosion system along with application training of Lewis Engineers for the pipeline's Viking Johnson joints. The selected Denso system meets the P2 Civil Engineering Specifications for Water Industry and consists of Denso Primer D, Profiling Mastic and 150mm width Densoclad 70 Tape. Denso Profiling Mastic is a vital part of the system, it is applied to seal the voids, bolts and heads around the joints to avoid moisture entrapment. The Densoclad Tapes consist of a thick polymer-bitumen adhesive, giving superior adhesion and flexibility, laminated to a tough plasticised PVC backing.

It is expected that Lewis Civil Engineering will install more than six hundred 700mm by 600mm joints and nearly two hundred 700mm diameter Viking Johnson joints. In addition to this there are six 450mm diameter spigot & socket joint pipes. All pipe lengths and joints were supplied in new condition, so no blasting pretreatment was required.

CAPTION: Winn & Coales area manager, top right, trained Lewis Civil Engineering staff to achieve best application of the Denso P2 Joint Protection System

The Denso materials were supplied via Burdens Civil Group, Merthyr Tydfil.

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