Double protection for Brighton storm-water scheme

Citation

(1998), "Double protection for Brighton storm-water scheme", Anti-Corrosion Methods and Materials, Vol. 45 No. 3. https://doi.org/10.1108/acmm.1998.12845cab.006

Double protection for Brighton storm-water scheme

Methods

Double protection for Brighton storm-water scheme

Keywords Brighton, Coatings, Denso, Southern Water, Water industry

Southern Water is investing some £36 million in a storm-water scheme for Brighton and Hove. Now nearing completion, it consists of a six-metre diameter tunnel that has been constructed 35m below the promenade, stretching for 5.1km. The project manager for the undertaking is Hyder Consulting Ltd of Guildford. The Victorian interceptor section passes waste water to a waste water treatment works at Portobello. At times of heavy rain the interceptor sewer cannot pass all the combined flow to treatment and overflows discharge the storm-water to areas above the low water tide level. The new tunnel will hold 150,000m³ of storm-water until it can be returned for treatment. There are four drop shafts along the route of the storm-water tunnel, three of them containing drop pipes made from GRP. The largest of the four, the Albion drop pipe, has been constructed from stainless steel. This was chosen to give the necessary strength plus resistance to abrasion from solids in the storm-water. In considering a number of protective coating systems for the outside of the drop pipe, Hyder Consulting Ltd required something that would not only give long-life protection but also allow future inspection of the metal substrate. Winn & Coales Denso Steelwork Tape preceded by S 105 paste was suggested. The Denso system was applied to the whole exterior by contractors Shutdown Maintenance Services Ltd. Hyder Consulting reports that: "We find it an advantage to be able to peel back small areas of the Denso Steelwork Tape to examine the condition of the surface underneath."

On a separate earlier contract, Archco-Rigidon system 623D heavy duty lining formulated from a vinyl ester resin reinforced with chopped strand glass-fibre mat was applied to the interior of the inlet pipe by Spray International, a subsidiary of Winn & Coales.

The Winn & Coales exterior and interior protective systems will now give long-life protection to the Albion Shaft.

Further details available from: Winn & Coales (Denso) Ltd, UK. Tel: +44 (0) 181 670 7511; Fax: +44 (0) 181 761 2456.