Danfoss iSave 50, iSave 70 Data sheet

Data sheet

iSave® Energy Recovery Device

iSave 50 / iSave 70

hpp.danfoss.com

Data sheet | iSave 50 and iSave 70

Table of Contents Contents

1. General information.....................................................................3

2. Benets.................................................................................3

3. Applications ............................................................................3

4. Technical data ..........................................................................4

4.1 iSave without motor ....................................................................4

4.2 iSave with IEC motor ....................................................................6

4.3 iSave with NEMA motor .................................................................7

5. Performance curves.....................................................................8

5.1 Flow at dierent rpm....................................................................8

5.2 iSave 50 ow curves.....................................................................8

5.3 iSave 70 ow curves.....................................................................8

5.4 Torque curve for iSave 50 and iSave 70...................................................9

5.5 Mixing curve ............................................................................9

6. Temperature and corrosion.............................................................10

6.1 Operation..............................................................................10

7. Installation.............................................................................10

7.1 Operation and mounting...............................................................10

7.2 Horizontal mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

7.3 Connection to inlet or discharge ports: .................................................11

7.4 Filtration...............................................................................11

7.5 N o ise ..................................................................................11

7.5 RO systems with an iSave...............................................................12

8. Dimensions and connections...........................................................14

8.1 iSave 50-70 without electric motor .....................................................14

8.2 iSave 50-70 with with IE3 motor 18.5 kW on base frame vertical_front mounted .........15

8.3 iSave 50-70 with with IE3 motor 18.5 kW on base frame vertical_back mounted..........16

8.4 iSave 50-70 with with IE3 motor 18.5 kW on base frame horizontal ......................17

8.4 iSave 50-70 th NEMA motor 30 HP on base frame vertical - front mounted ...............18

8.5 iSave 50-70 with NEMA motor 30 HP on base frame vertical - back mounted .............19

8.5 iSave 50-70 with NEMA motor 30 HP on base frame horizontal ..........................20

9. Service.................................................................................21

9.1 Warranty...............................................................................21

9.2 Operational conditions of concern......................................................21

9.3 Maintenance...........................................................................21

9.4 Repair assistance.......................................................................21

10. Accessories ............................................................................21

11. Useful documents......................................................................21

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AI264763692435en-000901 | Data sheet iSave 50-70 | UK | 04.2021

Data sheet | iSave 50 and iSave 70

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
uid 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 xed displacement pumps in which the ow
is proportional to the number of revolutions
(rpm) of the driving shaft – enabling ow control.
Speed control is made by a VFD. The iSave design
ensures lubrication of the moving parts by the
uid itself.

1. 3” Victaulic connections

2. Shaft

3. Low pressure shaft seal

4. Port ange

6. Valve plate

7. Cylinder barrel

9. Port plate (brine)

10. Port plate (sea water)

11. Vane s

12. Coupling

13. Intermediate ange

14. Rotor

15. Rotor element

16. Sealing plate

17. Stat or

18. Motor end ange

All parts included in the iSave 50 & 70 are
designed to provide long service life with a
constant high eciency and minimum service
required.
Unlike a centrifugal pump, it produces a similar
ow at a given speed no matter what discharge
pressure.

2. Benets • Corrossion resistance (all wetted parts are made

• Signicant power savings and low specic

energy consumption (SEC)

• Simple and space-saving installation with

both pump and pressure exchanger in one

of high corrosion-resistant materials e.g. Super
Duplex or Duplex)

• Fewer components

unit

• Simple system design and monitoring

without requirement for high-pressure ow
meters

• Simple operation with design that prevents

overspin/overushing

• Easy modular service

3. Applications

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

• Oshore platforms for the oil and gas
industry

• Municipal and private waterworks

AI264763692435en-000901 | Data sheet iSave 50-70 | UK | 04.2021

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Data sheet | iSave 50 and iSave 70

4. Technical data 4.1 iSave without motor

iSave size iSave 50 iSave 70

Code number 180F7020 180F7021

Pressure

Max. dierential pressure (HP out - HP in)

Min. pressure HP out (min. allowable working
pressure)

Max. pressure HP out (Max. allowable working
pressure, MAWP)

Min. pressure on HP in,
intermittent

Max. pressure LP in (MAWP)

Max. pressure LP in, peak

Min. allowable working pressure LP in

Max. dierential pressure (LP in - LP out)

Max. static test pressure (HP in and HP out)

Max. static test pressure (LP in and LP out)

Speed

Min. speed rpm 525 625

Max. speed rpm 650 875

Typical ow

Flow at min. speed, HP out

Flow at max. speed. HP out

Max. lubrication ow at 60 barg (871 psig)

Peak ow, LP in

Max. allowable working ow, LP in

1)

2) 3)

4)

10)

barg 5 5

psig 72 72

barg 40 40

psig 580 580

barg 83 83

psig 120 0 120 0

barg 2 2

psig 29 29

1)

barg 5 5

psig 72 72

barg 10 10

psig 145 145

barg 2 2

psig 29 29

barg 0.53 0.79

psig 7.69 11.4 6

barg 108 108

psig 1566 156 6

barg 13 13

psig 189 189

m³/ h 42 50

gpm 184 220

m³/ h 52 70

gpm 228 308

l/min 25 25

gpm 6.6 6.6

m³/ h 120 120

gpm 528 528

7)

m³/ h 57. 2 70

gpm 252 308

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AI264763692435en-000901 | Data sheet iSave 50-70 | UK | 04.2021

Data sheet | iSave 50 and iSave 70

Technical specications

Media temperature

Ambient temperature

Filtration requirements (nominal)

Salinity increase at membrane at 40% recover y rate at
balanced ow

Weight (dry)

Weight (operation with water)

Noise

Sound pressure level L

Torque data

Max. allowable working torque

Max. starting torque (stick/slip)

o

5)

6)

9)

C 2-35 2-35

o

F 36-95 36-95

o

C 0-50 0-50

o

F 32-122 32-122

3 micron melt-blown

2-3%

kg 164 164

lb 362 362

kg 172 172

lb 379 379

8)

PA

1 m

dB(A) 83 86

Nm 170 190

lbf-ft 125 140

Nm 180 180

lbf-ft 132 132

1)

Max. allowable working pressure of continous
operation. For lower and higher pressure, please
contact Danfoss.

2)

Typical pressure level at start-up and permeate

ush.

3)

Intermittent pressure is acceptable for less than 10

minutes within a period of 6 hours.

4)

Typical average ow at 60 barg and 3 barg

dierential pressure

5)

Dependent on NaCI concentation.

6)

Please see section 7.4 ltration.

7)

Continuous operation: iSave can operate
continuously with up to 10% over ush with the
limitation that the ow rate at LP inlet shall not
exceed 70 m3/h.

8)

A-weighted sound pressure level at 1 m from the
pump unit surfaces (reference box) acc. to EN ISO
20361 section 6.2. The noise measurements are
performed acc. to EN ISO 3744:2010 on a motor-
pump-unit at max. pressure and rpm.

9)

Balanced ow: The mixing rate is dened at
balanced ow when HP-out is equal to LP-in.

10)

At system start-up: iSave can run for up to 10 min.
with 150% of max. rated ow at LP inlet. The time
where max. rated ow is exceeded should be kept
as short as possible to minimize wear.

AI264763692435en-000901 | Data sheet iSave 50-70 | UK | 04.2021

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Data sheet | iSave 50 and iSave 70

4.2 iSave with IEC motor

i

iSave size iSave 50 iSave 70

Code number (vertical) 180F7038 180F7040

Code number (horizontal) 180F7023 180 F7025

Pressure, Speed, Flow, Temperature and Torwue are identical with 180F7020 and 180F7021

Eciency

Eciency at max. speed at 60 barg (871 psig) % 93.7 92.4

Technical specications

Media temperature

Filtration requirements (nominal)

Weight (dry) vertical/horizontal

Weight (operation with water) vertical/
horizontal

Noise

Sound pressure level L

Footprint

Footprint (vertical position)

Footprint (horizontal position)

Torque data

Max. allowable working torque

Max. starting torque (stick/slip)

Motor data

Nominal speed rpm 985 985

Rated current at 400V A 37 37

Motor size

Frame size

Rated motor torque at nominal speed

Rated motor ambient temperature

Motor insulation Class B B

Motor degrees of protection IP 55 55

5)

°C 2-35 2-35

°F 36-95 36-95

6)

3 micron melt-blown

kg 441/463 441/463

lb 972/1021 972/1021

kg 470/471 470/471

lb 1036/1038 1036/1038

2)

PA

1 m

3)

dB(A) 83 86

m² 0.44 0.44

foot² 4.71 4.71

3)

m² 0.76 0.76

foot² 8.14 8.14

Nm 170 177

lbf-ft 125 130.5

Nm 180 180

lbf-ft 132 132

kW 18.5 18.5

HP 30.0 30.0

IEC 200 L 200 L

Poles 6 6

Nm 177 177

lbf-ft 130. 5 130.5

4)

°C 40 40

°F 104 104

2)

A-weighted sound pressure level at 1 m from the ERD
unit surfaces (reference box) acc. to EN ISO 20361
section 6.2. The noise measurement are performed
acc. to EN ISO 3744:2010 on an ERD with motor
(motor pump unit) from min. to max. pressure and

6)

Please see section 7.4 Filtration

7)

Typical eciency for pressure exchanger, ..
booster pump, electrical motor and VFD at 3
barg dierential pressure after a system has ...
been commissioned and run in.

speed.

3

Area covered with recommended IE3 motor

congurations (excl. of space to service the ERD)

4)

For higher temperature, contact Danfoss.

5)

Dependent on NaCI concentation.

6

AI264763692435en-000901 | Data sheet iSave 50-70 | UK | 04.2021

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Data sheet | iSave 50 and iSave 70

4.3 iSave with NEMA motor

iSave size iSave 50 iSave 70

Code number (vertical) 180U0062 180U0064

Code number (horizontal) 180U0003 180U0005

Pressure, Speed, Flow, Temperatue and Torque are identical with 180F7020 180F7021

Eciency

Eciency at max. speed at 60 barg (871 psig)

Technical specications

Media temperature

Filtration requirements (nominal)

Weight (dry) vertical/horizontal

Weight (operation with water) vertical/
horizontal

Noise

Sound pressure level L

Footprint

Footprint (vertical position)

Footprint (horizontal position)

Torque data

Max. allowable working torque

Max. starting torque (stick/slip)

Motor data

Nominal speed rpm 118 0 118 0

Rated current at 400V A 36.2 36.2

Motor size

Frame size

Rated motor torque at nominal speed

Rated motor ambient temperature

Motor insulation Class B B

Motor degrees of protection IP 55 55

2)

A-weighted sound pressure level at 1 m from the ERD
unit surfaces (reference box) acc. to EN ISO 20361
section 6.2. The noise measurement are performed
acc. to EN ISO 3744:2010 on an ERD with motor
(motor pump unit) from min. to max. pressure and
speed.

3

Area covered with recommended IE3 motor

congurations (excl. of space to service the ERD)

4)

For higher temperature, contact Danfoss.

5)

Dependent on NaCI concentation.

7)

% 93.7 92.4

5

)

6)

°C 2-35 2-35

°F 36-95 36-95

3 micron melt-blown

kg 484/506 484/506

lb 10 67/1116 10 67/1116

kg 513/535 513/535

lb 1131/1179 1131/117 9

2)

PA

1 m

3)

dB(A) 83 86

m² 0.44 0.44

foot² 4.71 4.71

3)

m² 0.76 0.76

foot² 8.14 8.14

Nm 170 177

lbf-ft 125 130.5

Nm 180 180

lbf-ft 132 132

kW 22.5 22.5

HP 30.0 30.0

NEMA 324/6T 324/6T

Poles 6 6

Nm 179 179

lbf-ft 132 132

4)

°C 40 40

°F 104 104

6)

Please see section 7.4 Filtration

7)

Typical eciency for pressure exchanger, ..
booster pump, electrical motor and VFD at 3
barg dierential pressure after a system has ...
been commissioned and run in.

)

AI264763692435en-000901 | Data sheet iSave 50-70 | UK | 04.2021

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