Posted on 22 May 2015
Natural Resources Wales (NRW) has upgraded its Greenmore drainage pumping station, near Newport, Wales, with the introduction of a new Archimedes screw pump retrofitted alongside two existing axial flow submersible pumps.
The first energy consumption figures show a reduction of over 40 percent compared to the original arrangement.
The project was designed and installed by ECS Engineering Services, the UK supply and service agent for Dutch-based Landustrie.
|Normally the water level downstream (right) is less than 1 m higher than upstream (left). This allows the Archimedes pump to operate for longer periods and to keep the other pumps in reserve only for extreme events.|
Cost effective water level management
In partnership with Landustrie, ECS worked with Natural Resources Wales to design an environmentally sympathetic pumping system that would not only be more energy efficient, but also fish friendly, a feature not associated with traditional submersible pumping systems.
The pumping station now uses three pumps on a duty-assist-standby basis to maintain the local water levels with the new pump system providing duty capacity. The Archimedes screw pump is ideally suited to this application in maintaining water levels.
By using the screw pump as the primary pump, it can be allowed to operate for longer periods, keeping the remaining submersibles in reserve in case of greatly increased flows during storm conditions.
The new pump is powered, through a variable speed drive, by a 5.5kW motor, connected to a reduction gearbox which enables it to pump up to 0.2m3/second, which is more than sufficient for the normal flows at this station.
Even more energy saving
Initial calculations suggested that the new screw pump should deliver an energy saving of 40%. However, Natural Resources Wales wanted confirmation of this and so the actual energy savings were closely monitored over a 6 month period and compared to the submersible pumping system, the Archimedes screw pump is in fact delivering a 44% energy saving.
Jamie Wesley, Commercial Manager, Water Control Division at ECS, comments: "This project demonstrates just one of the many applications that can benefit from the energy saving design of the Archimedes screw pump. Natural Resources Wales has been very impressed by the real world savings and is looking at installing more screw pumps in similar applications."
One way flow
The project also included replacement of the flap valve mechanism, which ensures a one way flow of the drainage water and can prevent any tidal water from the river Severn from entering the freshwater channels.
With responsibilities to maintain almost 2,000 miles of flood defences, main rivers and more than 4,000 sluices, outfalls, floodgates and barriers, Natural Resources Wales has a great deal of involvement in the waterways of Wales. Part of its responsibility is to maintain the drainage systems and ensure that they operate as efficiently as possible.
This news item was originally published on the website of ECS Engineering Services.
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