Self cleaning intake filters solves pumping problems
11 September 2007, News release from Rotorflush Filters
Pumps are wonderful things, they work fine in clean water, but quickly "gunge up" when trying to pump water with suspended debris. If the pump manages to stay free from clogging, then the valves and nozzles the pump is supplying soon stop working.
Jim Hosford of Rotorflush Filters first came up with a self-cleaning suction filter in 1994 when he was a dairy farmer. Pumping effluent from his dairy unit caused no end of problems, with the pump and irrigator jets blocking with straw and cow manure. The self-cleaning filter he designed, fitted to the end of the suction hose of the pump. This prevented debris from blocking the system and enabled it to continue working without maintenance for months on end. It was so successful that he soon started manufacturing them for other farmers.
Things have come along way since then, and the product range has grown from small plastic self cleaning filters for garden pond pumps, to industrial versions that are to be found at sewage works, farms and factories around the world
Rotorflush's most popular products are the range of Filterpumps. These are submersible pumps with integral self-cleaning intake filters. The intake screen stops debris from being sucked into the pump and the self-cleaning mechanism ensures that they only need minimal maintenance. The filter mesh is sufficiently fine to enable high-pressure multistage pumps to be used in situations where previously only low head solid handling pumps could be installed.
Rotorflush now has over 100 reference sites on sewage works in the UK, where they are supplying wash water from raw sewage or final effluent for inlet screens, saving valuable potable water. The Filterpump combines a high pressure pump and self-cleaning inlet filter into one easily installed unit. All that is required is to mount the pump in a suitable tank or flume, attach the pipe work to the intake screen or wash water main and switch on. Water is filtered to 300 microns, (finer screens are available) pressurised to 10 bars and provides flow rates up to 12m3/hr.
The latest development is a control valve, which can be fitted as an integral part of the Filterpumps. This makes the self-cleaning filter virtually unblockable whatever the conditions and raises the possibility of a cost effective way to de-water lagoons leaving the solids behind. This could reduce the amount of wastewater transported around the country.
Rotorflush's customers are continually finding new applications for the Filterpumps. Recent applications range from filtering water from a steeple jack's water cooled chainsaw, providing filtered samples to online analysers to the nuclear industry.