The reverse osmosis pump design originate from oil hydraulics and was subsequently redesigned by Danfoss, during the last 15 years, to pump tap and seawater. Tens of thousands of pumps are in operation worldwide proving the pumps to be among the most cost-effective and reliable pumps for membrane applications. The pump are used as main high-pressure pumps for reverse osmosis plants but also for recovering energy as reversing pumps (motors) in the reject line.
The reverse osmosis pumps are made in Duplex and Super-duplex materials as standard.
With the Danfoss reverse osmosis pumps you get the following benefits:
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Low energy consumption
Total efficiencies up to 95 percent – among the most efficient in the market. Permeate cost by the use of Danfoss Reverse Osmosis Pumps and energy recovery can be reduced to just below 2 kWh/m3 (Click on the link below to see graph)
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Long service life
Danfoss guarantees service free operation for more than 8,000 hours thanks to two design features:
• No oil lubrication: the medium itself lubricates the reverse osmosis pump.
• No need for service on a regular basis: the mechanical shaft is the only seal in the reverse osmosis pump.
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Corrosion resistance
All wetted parts of the reverse osmosis pump are designed in duplex, super duplex stainless steel and polymer, ensuring resistance to corrosive and low viscosity fluids, e.g. seawater and brackish water in reverse osmosis water makers and reverse osmosis plants
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High-pressure operation
Continuous operation at a discharge pressure between 10 and 80 bar (145-1160 psi). Higher discharge pressures are available on request.
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Wide flow range
One pump size covers the same flow range as several centrifugal pumps, because the flow is a linear function of the speed (rpm). The reverse osmosis pumps run at speeds between 700 and 3,450 rpm (Click on the link below to see graph)
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Low pulsation
A design featuring up to nine pistons reduces pressure pulsations in the discharge line down to 1.5 percent, rendering pulsation dampers superfluous addition, and reducing installing cost. (Click on the link below to see graph)
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Constant Flow
Unlike other pump principles, the APP pump provides an almost constant flow regardless of variations in the pressure. This means that the flow will remain constant irrespective of e.g. a gradual membrane contamination. (Click on the link below to see graph)
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Compact design
The most compact reverse osmosis pump on the market. Giving system builders a free hand to design more compact systems. The reverse osmosis pump may also be directly mounted onto an electrical motor via a bell-housing with a flexible coupling. No need for frames, belt drive or gearbox.
Danfoss A/S RO Solutions can supply all reverse osmosis pumps with ATEX approval mounted with EX-proof Zone II motors via stainless steel housing for offshore applications.