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Friday, 02 December 2005
Two recently completed Combined Sewage Overflow upgrade projects in urban Sheffield demonstrate the versatility of Hydro’s Heliscreen® in assisting the Yorkshire Water Services Ltd AMP3 programme to improve the city’s water quality to the Environment Agency’s standards. At the Atlas Works and Carlisle Street sites, twin Heliscreen®s were retrofitted into existing chambers under the road surface. Both projects were designed to improve existing CSO arrangements. During heavy rainfall the chamber overflowed into the watercourse causing pollution by visually offensive material. To upgrade this to a positive screening method, at an economical cost, Yorkshire Water installed twin patented Heliscreen®s in double high-sided weirs. Both units were supplied with bespoke stainless steel flow channels which enabled complete mechanical installation within one day with minimal civil work. The Atlas Works installation under an urban road comprised two 700 X 2500mm units with a maximum inlet flow of 1593 l/s (1 in 5 year) and a maximum screened flow of 1328 l/s (1 in 5 year). carlisle_016.jpgThe Carlisle Street Heliscreen® installation is under a highway and the two 500 X 5000mm units are designed for a maximum inlet flow of 2804 l/s (1 in 5 year) and a maximum screened flow of 2015 l/s (1 in 5 year).  Yorkshire Water’s Contracts Manager, Peter Meyerscough, commented: “The Heliscreen® is an efficient, versatile and cost-effective unit. The bespoke Heliscreen® installations at Carlisle Street and Atlas Works were completed on time and within our normal 10-12 week delivery period”. Hydro International’s patented Heliscreen® is a self-cleansing, low head loss screening device that protects CSO outfalls by retaining all matter greater than 6mm (in 2 directions) in the foul continuation flow to the treatment works. The robust, minimal maintenance Heliscreen® works effectively even in totally flooded chambers with surcharged outflow pipes and is able to handle high screening concentrations. Main contractor on the Atlas Works and Carlisle Street sites was ETM. If you would like any further information on the Hydro Heliscreen® or any of Hydro’s other storm and wastewater management systems, please call 0800 269371.
 
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