Danfoss iSave 50, Operating Manual

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Data sheet | iSave 50 and iSave 70
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180R9357 | AQ265943679828en-00100
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IOM iSave 50 - 70 | 0
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.202
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1. General information Energy Recovery Devices (ERD) are used in
reverse osmosis (RO) systems to recycle the
energy held in discharged brine from the
membranes. Thus, iSave 50 and iSave 70 are
designed for use with low viscosity and corrosive
fluid such as sea water.
The Danfoss iSave Energy Recovery Devices all
consist of an isobaric pressure exchanger and a
positive displacement pump combined into one
compact unit. The high-pressure booster pump
is based on the vane pump principle enabling a
very light and compact design. The vane pumps
are fixed displacement pumps in which the flow
is proportional to the number of revolutions
(rpm) of the driving shaft – enabling flow control.
Speed control is made by a VFD. The iSave design
ensures lubrication of the moving parts by the
fluid itself.
All parts included in the iSave 50 & 70 are
designed to provide long service life with a
constant high efficiency and minimum service
required.
Unlike a centrifugal pump, it produces a similar
flow at a given speed no matter what discharge
pressure.
2. Benefits • Corrossion resistance (all wetted parts are made
of high corrosion-resistant materials e.g. Super
Duplex or Duplex)
• Fewer components
Danfoss iSave ERDs are built into a broad range
of RO desalination plant around the world.
Typical applications for iSave 50 - 70 will be:
• Containerized solutions for hotels and
resorts on islands as well as coastal regions
• Onboard systems for ships
• Offshore platforms for the oil and gas
industry
• Municipal and private waterworks
• Significant power savings and low specific
energy consumption (SEC)
• Simple and space-saving installation with
both pump and pressure exchanger in one
unit
• Simple system design and monitoring
without requirement for high-pressure flow
meters
• Simple operation with design that prevents
overspin/overflushing
• Easy modular service
1. 3” Victaulic connections
2. Shaft
3. Low pressure shaft seal
4. Port flange
6. Valve plate
7. Cylinder barrel
9. Port plate (brine)
10. Port plate (sea water)
11. Vanes
12. Coupling
13. Intermediate flange
14. Rotor
15. Rotor element
16. Sealing plate
17. Stator
18. Motor end flange
3. Applications