3-in-1 energy recovery device
The 3-in-1 Energy Recovery Device (ERD) optimized for sea water reverse osmosis applications. With iSave you get pressure exchanger, booster pump and motor integrated into one compact unit for high efficiency and short pay-back time.
The small footprint of iSave makes it a popular solution when the space is limited. When fitted with iSave, the Danfoss APP pumps produce more fresh water per square meter than any other system in the market.
- iSave 21: View the 3D model
- iSave 40 HORIZONTAL: View the 3D/Model
- iSave 40 VERTICAL: View the 3D model
- iSave 70 HORIZONTAL: View the 3D model
- iSave 70 VERTICAL: View the 3D model
iSave can be used in almost any SWRO application – land-based or marine, new or retrofit. The 3-in-1 design allows fast commissioning, continuous monitoring of performance and easy regulation to accommodate seasonal changes. Other isobaric devices have been known to cause over-spin and over-flushing that lead to poor process control and low efficiency. This is avoided with the active control possibilities offered by the iSave technology.
iSave captures hydraulic energy from the high pressure reject stream of the SWRO process and transfers the energy back into the system, drastically reducing the energy consumption regardless of flow rate and size of your SWRO system. Besides substantial energy savings, the iSave ERD also cuts capital expenditure by reducing high-pressure pump size, number of pipes and components thanks to its integrated design.
![iSave ERD for reverse osmosis - Brochure - Danfoss](/media/4053/isave-brochure-danfoss.jpg?anchor=center&mode=crop&width=810)
Superior energy recovery in SWRO
Danfoss iSave is a patented, high-efficiency Energy Recovery Device (ERD) that guarantees constant membrane feed in SWRO applications of any size – on land, at sea or on the move.
Features and benefits
Extensive application know-how
Competitive efficiency rates
Compact – pressure exchanger, pump and motor in one unit
Easy and service-friendly design
Simple and reliable with high uptime
Short pay-back time
![iSave selection tool - Danfoss](/media/4370/isave.png?anchor=center&mode=crop&width=810)
iSave selection tool
Download the iSave selection tool for easy calculation and selection. Calculate amount and size of iSaves for your project.
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Danfoss is dedicated to engineering energy efficient solutions. Our blog explores issues related to energy and cost efficiency in seawater reverse osmosis.
Wherever simplicity and space matter, iSave's 3-in-1 design makes energy recovery as easy as it is efficient.
iSave's unique design puts three key components of isobaric energy recovery exactly where they belong: right next to each other. So now engineers can configure RO systems that are simpler, smaller and easier to operate – not least in tight places like containers.
When installed with compact APP high-pressure pumps, the Danfoss pump-and-ERD package produces more fresh water per square meter than any other system on the market.
![](/media/12476/photo-water_hpp-video.jpg?width=486&height=1920&rnd=132130835942770000?anchor=center&mode=crop&width=1920&height=420)
The importance of energy efficiency in the desalination process
Juan Manuel Ortega, renowned desalination expert, tells about the importance of using highly efficient energy recovery devices and high-pressure pumps.
![](/media/1425/resort-onshore-reverse-osmosis-danfoss.jpg?anchor=center&mode=crop&width=810)
Highly energy efficient high-pressure pumps
With efficiency rates up to 92%, the APP pump technology offers the highest efficiency in the industry.
Product range
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }iSave 21 PlusiSave 21 Plus is a powerful ERD for smaller plants with a water capacity of 110 to 350 m3 per day. iSave 21 Plus is designed for high reliability, low maintenance and reduced lifecycle costs.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }iSave 40The iSave 40 consists of an isobaric pressure exchanger, a high-pressure positive displacement booster pump and an electric motor. Max. differential pressure: 5 barg/72 psig. Speed: 600 - 1200 rpm.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }iSave 50iSave 50 is designed for use with low viscosity and corrosive fluid such as sea water. Max. differential pressure: 5 barg/ 72 psig. Speed: 525-650 rpm
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }iSave 70iSave 70 is designed for use with low viscosity and corrosive fluid such as sea water. Max. differential pressure: 5 barg/ 72 psig. Speed: 625-875 rpm.
Documents
Type | Name | Language | Valid for | Updated | Download | File type |
---|---|---|---|---|---|---|
Data sheet | iSave 21 Plus and iSave 40 Data sheet | English | Multiple | 12 Apr, 2023 | 4.2 MB | |
Data sheet | iSave 21 Plus and iSave 40 Data sheet | Spanish, Castilian | Multiple | 25 May, 2018 | 2.9 MB | |
Data sheet | iSave 21 Plus and iSave 40 Data sheet | German | Multiple | 25 May, 2018 | 3.4 MB | |
Data sheet | iSave 50 -70 Data sheet | English | Multiple | 08 May, 2024 | 3.6 MB | |
Data sheet | iSave 50 -70 Data sheet | Spanish, Castilian | Multiple | 14 Apr, 2021 | 2.4 MB | |
Brochure | Superior energy recovery in SWRO | English | Multiple | 01 Jan, 2015 | 1.6 MB | |
Brochure | Superior energy recovery in SWRO | English | United States | 18 May, 2018 | 1.1 MB | |
Brochure | Superior energy recovery in SWRO | Spanish, Castilian | Multiple | 18 May, 2018 | 1.2 MB |
Software
![iSave selection tool - Danfoss](/media/4370/isave.png?anchor=center&mode=crop&width=810)
iSave selection tool
Download the iSave selection tool for easy calculation and selection. Calculate amount and size of iSaves for your project.
Related products
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }High-pressure pumps for SWRO applicationsThe range of high-pressure APP pumps is optimized for both landbased, off-shore and marine sea water reverse osmosis applications. Available with or without motor.
Case stories
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Efficient Danfoss components aboard world’s largest wellboatLearn how Quantum Water selected Danfoss APP high-pressure pumps, iSave ERDs, and VFDs for the SWRO plant on the world's largest wellboat to save space, energy, and maintenance.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Danfoss pumps chosen to purify landfill leachate wastewaterCompact and reliable APP pumps with long service intervals were first choice for a purification system in Chongqing.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Innovative marine SWRO builds on Danfoss APP pumpsHP Watermakers has developed pioneering marine SWRO solutions that increase automation and integrate with their own and third-party applications. Danfoss APP pumps are their first choice for pumping water at high pressure.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Danfoss components provide energy-efficient fresh water for shrimp farmCompact, reliable and energy-efficient pump and ERD from Danfoss are chosen for SWRO plant producing fresh water for a shrimp farm located in an environmentally sensitive area.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Containerized SWRO unit retrofitted to save energy and maintenanceCompact and energy efficient pump from Danfoss replaces obsolete centrifugal pump. After 20,000 hours no maintenance has been needed and energy costs are reduced by 20%.
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if (isSmallPicture) {
; } else if (isBigColumns) { } else { }Danfoss supplies energy-efficient SWRO to a resort in the MaldivesCompact, reliable and energy efficient pumps and ERDs from Danfoss are chosen as key components for SWRO plant producing fresh water for a multi-island resort complex in the Maldives.