Danfoss A/S RO Solutions is part of the global Danfoss A/S group producing components and high-pressure pump systems for the Reverse Osmosis market.
An extensive range of high-pressure pumps and accessories to power seawater RO applications:
We develop and market an extensive range of high-pressure pumps ranging from 0.6 to 30 m3/h (2.6 to 135 gpm).
APP (Axial Piston Principle) high-pressure pumps are designed to supply low viscosity and corrosive fluids under high-pressure, e.g. in seawater RO applications.
The APP high-pressure pumps are light and compact in design, and all pump parts are made of non-corrosive materials, e.g. Duplex and Super-Duples stainless steel and carbon-reinforced PEEK.
Our dedicated high-pressure pumps build on decades of development experience to provide exceptional efficiency and reliability in seawater RO applications.
Small in size and unsurpassed in engineering quality, the Danfoss range of high-pressure pumps are at the heart of more that 15,000 seawater RO systems throughout the world.
Pumps
With our Axial Piston Pumps especially developed for purification applications, we can provide a cost-effective pump for example
- Reverse Osmosis
- Nanofiltration
- Ultrafiltration
- Microfiltration
- Other low viscosity (>2ct) fluids prefiltered down to 10 micron absolute
Well-Proven Technology
The APP pumps (Axial Piston Pumps) are based on the axial piston principle. This principle was developed in the 1950s for oil hydraulic applications and revised further in the 1980s by Danfoss for water applications.
Pump Systems
Although the biggest APP pump ``only`` supplies 10, 2 m3/h, it is possible to increase the feed flow to the membrane. Danfoss A/S RO Solutions can provide a variety of pump systems on frames in all sizes – up to 40 m3/h feed flow.
Special pump systems for hazardous areas are supplied regularly for offshore applications with all the necessary approvals.
APP High-Pressure Pumps Advantages
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Market-leading efficiency: up to 97% efficiency
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Whisper quitet: Among the most silent in the industry
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Ultra-low maintenance reduces service costs
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Worldwide service and technical support
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Positive replacement pump, constant flow regardless of pressure
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Wide pressure range - 20-80 bar (290-1160psi)
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Self-lubricating: no oil lubrication necessary, ever
APP High-Pressure Pump Benefits
Reverse osmosis is a cost effective alternative to the traditional distillation method when doing desalination of seawater and brackish water. The only energy needed is the high pressure to force the water through the semi-permeable membrane. The highest possible efficiency of these reverse osmosis pumps (high pressure feed pumps) are therefore essential in the aim for low cost water production.
The reverse osmosis pump design originates 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 APP High-pressure pumps are made of Duplex and Super-Duplex materials as standard.
Low Energy Consumption
Total efficiencies up to 97% – among the most efficient in the market. Permeate cost by the use of Danfoss APP pumps and energy recovery can be reduced to just below 2 kWh/m3
Click On the Link to See Graph
http://www.danfoss.com/NR/rdonlyres/8A9D4098-E379-4DF6-9EDA-99500A7A58AE/0/Appsmallvolume.jpg
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8,000 Hours Maintenance Free Operation
Danfoss guarantees a minimum of 8,000 hours of operation (maximum 18 months from date of production) provided that the pump is used according to Danfoss specifications for pre-filtration, pressure, and rotation speed.
Corrosion Resistance
All wetted parts of the APP pumps are made of Duplex, Super-Duplex stainless steel and polymer, ensuring resistance to corrosive and low viscosity fluids, e.g. seawater and brackish water.
High-Pressure Operation
Continuous operation at a discharge pressure between 10 and 80 bar (145-1160 psi). Higher discharge pressures are available on request.
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 to See Graph
http://www.danfoss.com/NR/rdonlyres/A22BF5F3-2EB6-48C5-BFA6-28107E40C566/0/Flowcurves.jpg
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 to See Graph
http://www.danfoss.com/NR/rdonlyres/3472136B-B72B-4E5D-AA88-D1FD4CE46DB8/0/lowpulsation.jpg
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 to See Graph
http://www.danfoss.com/NR/rdonlyres/1292A3AD-9858-45A5-B524-C52A269E5608/0/constantflow.jpg
Compact Design
The most compact high-pressure pump on the market. Giving system builders a free hand to design more compact systems. The APP 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 APP High-pressure pumps with ATEX approval mounted with EX-proof Zone II motors via stainless steel housing for offshore applications.
