FLOW AND SURGE CONTROL UK first for Glasgow leakage
A pressure management strategy to reduce leakage in Glasgow involved a 400mm C-Valve from Plasson. The company’s sales and marketing manager, Simon Merckel, reveals how
n the first UK installation of its kind, a C-Valve from Plasson UK has been specified to supply a 400mm valve to pressure manage an area north of the river Clyde. The application can save up to 3.7Ml of water leakage per day at the Strobcross Street site in Glasgow city centre. The area serves approximately 24,000 properties and acts as an entry point for potable water to the city centre of Glasgow and a large area south of the Clyde. Known as a problem area in terms of leakage, the site had not previously been pressure controlled due to the wide operational requirements and low pressures in some areas.
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The valve was specified for the project as there was a need for a low head loss valve at peak flow times as conventional pressure reducing valves have a limited standing head loss of between three and eight metres when fully open, preventing their use in this location due to non-compliance with regulated pressure standards. According to Scottish Water, the C-Valve has a head loss that is less than the tolerance of the loggers measuring the valve when fully open, making it the most effective equipment for an installation of this type.
The objectives prior to installing the C-Valve were to reduce leakage, prevent pressure non-compliances due to valve restrictions and allow for servicing without by-passing through non-pressure managed pipe. The C-Valve ensures a constant pressure management system and allows for emergency flows and pressure modulation through a third party controller adjusting the valve. Following a period of observation where 2.3Ml/d were saved, a Technolog Modulo Controller was installed to regulate pressure according to the actual flow through the valve, taking a further 6m off the pressure during periods of low flow and resulting in an additional 1.4Ml/d saving. Installing the C-Valve has resulted in an impressive 3.7Ml/d total saving, much more than the 2.7Ml/d expected from modelling.
The Fluidic-Cone is for higher discharge rates and is available with spigot or plate fixings
Commenting on the installation, Jake Ratter at Scottish Water said: “We have seen impressive initial water savings since installing the valve and are extremely pleased with the results. The total leakage saving per day is 3,700m³.”
The installation also demonstrates an additional benefit of burst reduction in the city centre due to a more even pressure profile in the old and delicate network, reducing maintenance and cost due to a lower frequency of mains burst repairs. The modular design of the Plasson C-Valve system means that external filters can easily be serviced and the isolation valves enable rapid isolation of each control valve element prior to any servicing and the control plate is easily serviced or exchanged if required. The C-Valve delivers a reliable and stable pressure with minimum head loss and maximum reliability. The modular design and versatility means solutions can be tailored to suit specific needs with ease of installation, operation and maintenance.
www.plasson.co.uk
Helping to minimise flood risk W
avin, a supplier of water management, plumbing and drainage systems, has enhanced its Intesio stormwater management range with the introduction of a
comprehensive range of Vortex Flow Control Valves sold under the Intesio brand name. The Intesio Vortex Flow Control Valves have been developed to help minimise flood risk through the precise control of discharge flow rates from drainage and stormwater attenuation systems. Wavin says they can be used wherever a need to limit the rate of discharge within a drainage system has been identified and are ideal for use with modular stormwater attenuation systems like AquaCell. The regulation of stormwater run-off flow rates is achieved by hydraulic effect without the requirement of moving parts a
distinct advantage when considering on-going maintenance.
32 Water & Wastewater Treatment December 2010
The valves are self activating and clog resistant, due to the large flow path openings which reduce the risk of a blockage caused by debris passing through. Wavin says maintenance is easy as the integral by- pass door allows access for jetting and cleaning and the stainless steel construction ensures the valves are corrosion resistant.
The Intesio range includes the Fluidic-Amp, for low flow discharge rates up to 50l/s and Fluidic-Cone for higher flow discharge rates up to 120l/s. Both products are available with spigot or plate fixings depending on the application.
Wavin says Intesio offers a complete solutions package from specification right through to design and on-site support. Benefits include a tailored
service to suit individual site needs with a
wide range of stormwater management products on offer to cover various technical applications.
Precise control: Intesio Vortex Flow Control Valves
www.wavin.co.uk
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