Self cleaning pump finds more applications
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Rotorflush Filters product story
Edited by the Engineeringtalk editorial team
Apr 11, 2006
Submersible pump with self cleaning intake screen is being increasingly used to extract water from raw sewage and effluent to provide filtered and pressurised source of wash water for inlet screens.
Rotorflush's Filterpump, a submersible pump with a self cleaning intake screen, is being increasingly used to extract water from raw sewage and final effluent to provide a filtered and pressurised source of wash water for inlet screens at sewage works across the UK.
The self cleaning intake filter on the pump lets it be used in sewage and final effluent without danger of the pump or upstream valves and nozzles becoming blocked.
With outputs up to 2 litre/s at 4bar, it is suitable for providing wash water for inlet screens.
Being a submersible pump, there is no need for weather or frost protection, it is self priming and only requires a minimum water level of 300mm to operate, so can be installed into channels after the inlet screen, close to where the wash water is required.
Running costs are reduced in two ways.
The first and perhaps the biggest saving is the re-use of sewage water.
The cost of using potable water for sewage screens is considerable and a wasteful use of this resource.
The second is the reduction in losses from having long pipe runs which in conventional systems cause pipe friction losses and hence increased electricity consumption of the pressure sets.
There are eight models from single and three phase with outputs from 80 to 120 litre/min and pressures from 2.5 to 8.4bar.
The single phase versions are available with integral float switches.
The standard screen apertures on the self cleaning intake strainer are 315um which is more than enough filtration to prevent plugging of most nozzles and solenoid valves.
However, where finer filtration is required screens can be specified with apertures down to 50um.
An additional impeller inside the filter continuously backwashes the filter screen, removing any debris that might be sucked onto the screen every 0.5s enabling its use in water containing suspended solids of up to 2000mg/litre.
The pumps are constructed from stainless steel and have a double mechanical seal with an oil chamber giving increased protection from moisture ingress to the motor.
The pump is finding other uses, for example the provision of a filtered supply of water to online analysers, irrigation of effluent from dairy and pig farms, and prefiltration of water to membrane systems.
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