Water and Effluent Treatment Magazine
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Marais Stream pumping station required an upgrade to allow an increased volume of water to be collected and delivered to the nearby water treatment works floods at bay 01403 221000 Performance guaranteed systems designed for cost effective operation Odour Control Specialists www.ergapc.co.uk info@ergapc co.uk Industrial Penstocks Limited Total Flow Control Quality Assured Products Quality Assured Service Unit 1 & 2 Washington Ind Est, Washington Street, Netherton, West Midlands DY2 9PH t: 01384 458411 f: 01384 246952 sales@industrialvalve.co.uk Industrial Valves Limited Total Valve Packages Penstocks Installation and Site Support Actuated Valves Pipeline Products www.evoquawater.co.uk info.uk@evoqua.com © 2014 Evoqua Water Technologies Ltd Key benefits of adopting the PIM solution • Improved and more inclusive compliance reporting. • Faster and more accurate identification of the origin of compliance failures/customer complaint. • Improved network control during maintenance activity. • Efficient allocation of maintenance resources – improving reactive strategies. • Moving towards proactive control of the network through early warning, and prevention of quality and quantity failures. DIAGNOSE FAILURE. DELIVER QUALITY. THE PROACTIVE INFRASTRUCTURE MANAGEMENT (PIM) SOLUTION By collecting and transmitting water quality and quantity status data from within hydrant chambers - and in near real time - the PIM solution allows current network management strategies to be better guided. The number of unknowns regarding water quality and quantity variation/failure can be reduced; thus, providing you with more confidence when allocating resources. PIM solution data may be used to formulate proactive water quality management strategies. This can be achieved by allowing the condition of the network to be monitored through time and in space allowing maintenance intervention to be employed prior to customer grievance. year, can be diverted and dis- charged straight into the sea. The pumping station, the first on the island, could be consid- ered multifunctional, as it incor- porates three vital elements. Firstly, raw water (rainfall) is caught and transferred into Longue Hougue reservoir for con- version into drinking water. Sec- ondly, stream water is used to maintain the cleanliness of the screens at the new Belle Greve Wastewater Treatment Centre. Finally, the new pumping station enables excess water to be pumped out to sea, which might otherwise overload the capacity of the Barker's Quarry Reservoir and lead to localised flooding. "Festo supplied three pneu- matically operated penstocks, driven by linear actuators, to iso- late the flow; these were located in the incoming channel," Tony Gillard, business development manager at Festo explains. "DNC cylinders with rod clamps are used to control the raising and lowering of the penstocks. These distribute the incoming water into the storage basins. From the storage basins, the water is dis- tributed to various parts of the site by butterfly valves operated by pneumatic quarter-turn actuators." Flexibility The entire system is run by Fes- to's CPX remotely operated con- trol system. The site itself is unmanned and is controlled via the SCADA system from the Guernsey Water offices based five miles away. "The CPX plat- form is a complete automation solution that integrates a wide choice of pneumatic and electri- cal, analogue and digital I/O," Gillard says. "CPX systems con- figured for specific requirements are delivered pre-built, tested and ready for installation, ena- bling system integrators to meet tight deadlines and budgets. For additional flexibility, the CPX platform can operate as either a self-contained industrial PLC, or as a local unit on a Fieldbus or Industrial Ethernet-based dis- tributed system. In addition, a wide choice of I/O and connector modules makes interfacing to process sensors and actuators easy. "Remote operation is becom- ing more common; with pneu- matic control you have the func- tionality to remotely operate the system." Unusual for the water treat- ment sector is the selection of pneumatically controlled valves rather than electric. "On the mainland UK it is more usual to have electric actuators but the advantages of pneumatics are beginning to sway the market," Gillard says. "In most other applications, such as petro chemical and industrial applica- tions, pneumatics are the pre- ferred solution, but for some rea- son in water treatment and sewage plants electric actuation is still predominant for now." Pneumatic automation pre- sents a reliable alternative to electrical automation systems and reduces the costs of invest- ment, installation and operation compared with conventional electrical installations. Guernsey Water has gone down the path of changing elec- tric actuators to pneumatic and is reaping the benefits. Pneu- matic control delivers energy saving, ease of installation, safety and reliability, because of less moving parts, as well as being faster to operate and easier to control. n Linear Festo quarter-turn actuator DAPS are predominantly used to control valves SEPTEMBER 2014 WET NEWS 19