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.
With our Axial Piston Pumps especially developed for purification applications, we can provide a cost-effective pump for example
- Reverse Osmosis
- Other low viscosity (>2ct) fluids prefiltered down to 10 micron absolute
APP High-Pressure Pumps
Applications: APP pumps are designed to supply low viscosity and corrosive fluids under high pressure, e.g. in seawater RO applications.
Design: APP pumps are based on the Axial Piston
Principle, enabling a very light and compact design. Lubrication of the moving parts in the pumps is provided by the fluid itself, eliminating any need for additional lubrication.
APP pumps are fixed displacement pumps with constant flow, since flow is proportional to input shaft revolutions and pump displacement.
Materials: All pump parts are made of non-corrosive materials, e.g. Duplex and Super-Duplex stainless steel and carbon-reinforced PEEK.
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.
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
Market-leading efficiency: up to 97% efficiency
Whisper quitet: Among the most silent in the industry
Ultra-low maintenance reduces service costs
Worldwide service and technical support
Positive replacement pump, constant flow regardless of pressure
Wide pressure range - 20-80 bar (290-1160psi)
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.
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Sea Water Pump with Energy Recovery (SWPE)
Application: The SWPE is a high efficiency energy recovery unit for reverse osmosis filtration of sea water. Energy recovery is achieved by high-pressure brine from membranes being feed into the recovery device (APM) that converts the energy in the pressurized brine to mechanical energy for reuse by the electric motor.
Design: The SWPE energy recovery unit consists of an APP pump and an APM motor, both connected to a double-shafted electric motor. The permeate flow and recovery rate depend on the difference between the size of an APP and an APM, as they have a fixed volumetric displacement.
Capacity: SWPE are available in sizes from 4-30 m3/ day with recovery rates between 29 %-32 %. Other sizes are available upon request. Please contact your local Danfoss RO Solutions office.