Danfoss iSave 21 Plus, iSave 40 Data sheet

Data sheet

Data sheet

Energy Recovery Device

Energy Recovery Device

iSave 21 Plus / iSave 40

iSave 21-40

Body textBody textBody textBody text

www.danfoss.com

www.iSave.danfoss.com

hpp.danfoss.com

Data sheet | Energy Recovery Device | iSave 21 Plus and iSave 40

Table of Contents Contents

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

1.1 iSave 21 Plus ............................................................................3

1.2 iSave 40.................................................................................4

2. Benefits.................................................................................4

3. Technical data ..........................................................................5

3.1 iSave without motor ....................................................................5

3.2 iSave with IEC motor ....................................................................6

3.3 iSave with NEMA motor (can only be ordered through Danfoss US) .......................7

4. Flow at different rpm....................................................................8

5. Corrosion...............................................................................8

5.1 Operation...............................................................................8

6. Noise level..............................................................................9

7. Filtration................................................................................9

8. iSave drawings .........................................................................10

8.1 Assembled iSave 21 Plus and iSave 40 without electric motor ...........................10

8.2 Assembled iSave 21 Plus and iSave 40 with IEC electric motor ...........................12

8.3 Assembled iSave 21 Plus and iSave 40 with NEMA motor ................................18

9. Installation.............................................................................22

10. RO systems with an iSave...............................................................23

11. Performance curves....................................................................24

11.1 Performance and torque curves iSave 21 Plus ...........................................24

11.2 Performance and torque curves iSave 40................................................26

12. Service.................................................................................28

12.1 Warranty...............................................................................28

12.2 Maintenance...........................................................................28

12.3 R epair .................................................................................28

I

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521B14 64 | DKCFN.PD.003.4B.02 | 2018 .05

Data sheet | Energy Recovery Device | iSave 21 Plus and iSave 40

1. General information

iSave 21 Plus

iSave 40

1. 2” Victaulic connections

2. Shaft

3. Low pressure shaft seal

4. Port flange

5. Port plate

6. Valve plate

7. Cylinder drum

8. Port flange

9. Port plate

10. Pins

11. Vane s

12. Port plate

13. Coupling

14. Adapter flange

15. Rotor

16. Stator

17. Port flange

18. Outlet flange

The iSave 21 Plus and iSave 40 consists of an
isobaric pressure exchanger, a high-pressure
positive displacement booster pump and an
electric motor.

The isobaric pressure exchangers are based on
the technology used in the Danfoss APP pumps,
and the high-pressure booster pumps are based
on the vane pump principle enabling a very light
and compact design. The design of iSave 21 Plus
and iSave 40 ensures lubrication of the moving
parts by the fluid itself.

All parts included in the iSave 21 Plus and iSave
40 are designed to provide long service life with
a constant high efficiency and minimum service
required.

1.1 iSave 21 Plus

The vane pumps are fixed displacement pumps
in which the flow is proportional to the number
of revolutions of the driving shaft – enabling flow
control.

The electric motor provides speed control of
both the pressure exchanger and the high­pressure booster pump on the same shaft
– preventing overspin/overflushing.

The iSaves need a VFD that allows the motor to
apply a constant torque from low speed to
maximum speed.

The sectional drawings below illustrate the main
components of the iSave 21 Plus and iSave 40,
respectively

521B14 64 | DKCFN.PD.003.4B.02 | 2018 .05

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Data sheet | Energy Recovery Device | iSave 21 Plus and iSave 40

1.2 iSave 40

1. 3” Victaulic connections

2. Shaft

3. Low pressure shaft seal

4. Port flange

5. Port plate

6. Valve plate

7. Cylinder barrel

8. Port flange

9. Sealing plate

10. Pins

11. Vane s

12.Port plate

13. Coupling

14. Adapter flange

15. Rotor

16. Stator

17. Port plate

18. Outlet flange

2. Benefits

• One of the smallest and lightest energy recovery
devices on the market

• Few components

• High efficiency

• No need for high-pressure flow meters

• No expensive high-pressure mechanical seal

• No risk of over spin/over flushing

• Easy modular service

• All parts of the device are made of high

corrosion-resistant materials e.g. Super Duplex

(HP)
High-pressure outlet

(LP)
Low-pressure inlet

(HP)
High-pressure inlet

(LP)
Low-pressure outlet

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521B14 64 | DKCFN.PD.003.4B.02 | 2018 .05

Data sheet | Energy Recovery Device | iSave 21 Plus and iSave 40

3. Technical data 3.1 iSave without motor

iSave size iSave 21 Plus iSave 40

Code number 180F7015 18 0F 7011

Geometric displacement

Pressure

Differential pressure HP in - HP out max.

HP max. outlet pressure

HP min. inlet pressure

HP max. inlet pressure

HP inlet min. pressure,
intermittent

2) 3)

LP inlet max. pressure

LP inlet max. pressure intermittent

LP outlet min. pressure

LP differential LP in - out at HP max. flow

Speed

Min. speed rpm 500 600

Max. speed rpm 1500 120 0

Typical flow

HP outlet flow range

4)

at max. differential pressure

Lubrication flow at 60 barg (871 psig) max.

LP inlet max. flow

Torque

Torque at max. differential pressure
operation

1)

Max. starting torque (stick/slip)

Media temperature

5)

Ambient temperature

Filtration requirements (nominal)

Salinity increase at membrane at 40% recover y rate 2-3 %

Weight

1)

Continuous torque a bove max. differential pre ssure

will reduce the lifetime of the iSave.

2)

Pressure can reach this pressure level at start-up

and permeate flush.

3)

Intermittent pressure is acceptable for less than 10

521B14 64 | DKCFN.PD.003.4B.02 | 2018 .05

1)

3)

6)

cm³/rev 273 626

In³/rev 16.7 38.2

bar 5 5

psi 72.5 72.5

barg 83 83

psig 120 0 120 0

barg 15 20

psig 217 290

barg 83 83

psig 120 0 120 0

barg 3 3

psig 44 44

barg 5 5

psig 72 72

barg 10 10

psig 145 145

barg 1 1

psig 14. 5 14.5

bar 0.9 1.2

psi 13 17.5

m³/h 6-22 21- 41

gpm 26-96 92-180 .5

m³/h 0.4 0.8

gpm 1.8 3.5

m³/h 33 67

gpm 145 295

Nm 49 102

lbf-ft 36 75

Nm 50 150

lbf-ft 37 110

o

C 2-40 2-40

o

F 36 -122 36 -122

o

C 0-50 0-50

o

F 32-104 32-10 4

3 micron melt-blow

kg 47 123

lb 103 271

minutes within a period of 6 hours.

4)

Typical average flow at 60 bar.

5)

Dependent on NaCI concentation.

6)

Please see section 7. filtration.

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Data sheet | Energy Recovery Device | iSave 21 Plus and iSave 40

3.2 iSave with IEC motor

iSave iSave 21 Plus A)iSave 21 Plus iSave 40

Code number horizontal 180F7016 180F7017 180F7001 180F700 4
Code number vertical 180F7016 18 0F7017 180F7003 180F7005

Motor size IEC version IEC 400 V,

1)

50 Hz

Frame size

Motor data

Nominal speed rpm 1450 1450 970 970

Min. speed at 400 V rpm 500
Max. speed at 400 V rpm 1500 150 0
Rated current at 400 V A 11 15.2 22 30
Torque

Motor torque at norminal speed

Motor torque at min. speed

3)

Motor ambient temperature, max.

Motor insulation Class B B B B

Motor degrees of protection IP 55 55 55 55

Sound pressure level max.

6)

Weight

Footprint (horizontal/vertical)

kW 5.5 7.5 11 15
HP 7. 5 10 15 20
IEC 132 S 132 M 160 L 180 L
pole 4 4 6 6

Nm 36 49

3) 4)

lbf-ft 26.5 36 80 107.7
Nm 27 36 95 129
lbf-ft 20 27 70 95

o

C 40 40 40 40

o

F

dB(A) 78 79 84 84

kg 105 116 254 305

lb 231 255 560 672

m² 0.31 0.32 0.5/0.16 0.54/0.17

foot² 3.34 3.45 5.38/1.72 5.81/1.83

2)

500 600 600

3)

110 0 120 0

5)

108 14 6

12

2

122 122 12

2

A)

Differential pressure HP in - HP out max. is limited

to 3 bar [44 psi]

1)

Three-phase-asynchronous-motor according to
DIN-IEC and VDE 0530 standards.

• Voltage and frequency according to IEC 38

• The motors are fitted with a rating plate in
multi-tension: 380-420 V / 660-720 V, 50 Hz or
440-480 V, 60 Hz

• Tolerance ± 5% according to VDE 0530

• Standard coating according to IEC 60721-2-1

2)

If voltage is below 400 V we recommend to use
another size of electric motor.
Please contact Danfoss High Pressure Pumps for
further information.

3)

Torque load for iSave and motor see diagram on
page 23 and 25.

4)

Due to iner tia and stick-slip frictio n of the iSave, the
torque may exceed the maximum allowable
operation torque for the iSave when it is taken into
use and/ or speed is ramped up from zero to
maximum. A VFD or a soft starter must be used for
ramp up.

5)

The starting torque must not exceed the values
stated under “Max. starting torque (stick/slip)”. The
VFD must be able to deliver 140% start torque. The
Danfoss VFD type FC 301 and FC 302 can be used.
For advice on VFD settings, please consult our
relevant guideline or contact Danfoss.

6)

A-weighted sound pressure level at 1 meter 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 ERD with
motor (motor-pump unit) at max. pressure and
speed.

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521B14 64 | DKCFN.PD.003.4B.02 | 2018 .05

Data sheet | Energy Recovery Device | iSave 21 Plus and iSave 40

3.3 iSave with NEMA motor (can only be ordered through Danfoss US)

iSave iSave 21 Plus A)iSave 21 Plus iSave 40

Code number horizontal 180U0013 180U0052 180U0012
Code number vertical 180U0013 180U0052 180U0002

Motor size NEMA version

1)

High efficiency 460 V, 60 Hz

Frame size

Motor data

Nominal speed rpm

Min. speed continuous at 400 V rpm 500 500 600
Max. speed continuous at 400 V rpm 150 0 1500 120 0
Motor rated current 460 V A 12.4 18 24.2
Torque

Motor torque

Motor torque at min. speed

at norminal speed

4)

Motor ambient temperature, max.
3,300 feet above sea level

Motor degrees of protection IP 55 55 55

Sound pressure level max.

6)

Weight

Footprint (horizontal/vertical)

A)

Differential pressure HP in - HP out max. is limited

to 3 bar [44 psi]

kW 7.5 11 15
HP 10 15 20
NEMA 215TC 254 286TC
pole 4 4 6

Nm 40 59.7 119

3) 4)

(lbf-ft) 29.4 44
Nm 20 31 95
(lbf-ft) 14. 7 23 70

o

C 40 40 40

o

(

F)

dB(A) 78 79

kg 152 206 324

(lb) 335 454 715

m² 0.38 0.45/0.16 0.65/0.23

foot² 4.09 4. 85/1.72 7.0/2.48

2)

1760 1765 117 5

122 122 122

*)

Tested with IEC motor

5)

88.2

*)

84

1)

Three-phase-asynchronous-motor according to
NEMA MG-1 and UL 1004-1 standards.

• Insulation class F, service factor 1.25.

• Fan-cooled TEFC (IC411). Voltage and frequency
according to NEMA MG-1 part 12.

• The motors are fitted with a rating plate 230 /
460 V, 60 Hz.

• Plus or minus 10% of rated voltage, with rated
frequency. Standard coating according to
motor supplier specifications.

2)

Max. speed for iSave 21 is 1500 rpm.

3)

Torque load for iSave and motor see diagramme on
page 23 and 25.

4)

Due to inertia and stick-slip friction of the iSave, the
torque may exceed the maximum allowable
operation torque for the iSave when it is taken into
use and/ or speed is ramped up from zero to
maximum. A VFD or a soft starter must be used for
ramp up.

5)

The starting torque must not exceed the values
stated under “Max. starting torque (stick/slip)”. The
VFD must be able to deliver 140% start torque. The
Danfoss VFD type FC 301 and FC 302 can be used.
For advice on VFD settings, please consult our
relevant guideline or contact Danfoss.

6)

A-weighted sound pressure level at 1 meter 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 ERD with
motor (motor-pump unit) at max. pressure and
speed.

521B14 64 | DKCFN.PD.003.4B.02 | 2018 .05

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Data sheet | Energy Recovery Device | iSave 21 Plus and iSave 40

ppm

iSave 21 Plus

iSave 40

0

22

44

66

88

110

132

154

176

198

0

5

10

15

20

25

30

35

40

45

500 600 700 800 900 1000 1100 1200 1300 1400 1500

gpm

m3/h

rpm

Flow at HP out vs. rpm

4. Flow at different rpm The diagram shows that the HP flow can be
changed by changing the rotation speed of the
iSave. The flow/rpm ratio is constant, the
required flow is obtainable by changing the
rotation speed to a required value.

For accurate data please use our selection tool
which is available on our website:
www.isave.danfoss.com

The iSave is delivered with a 3.1 performance
certificate according to EN10204.

5. Corrosion

5.1 Operation

The chart below illustrates the corrosive
resistance of different types of stainless steel
related to NaCl concentration and temperature.
All critical parts of the iSave is made of
Super Duplex 1.4410/UNS 32 750 or Duplex

1.4462/UNS 32803.

º

80

C

70

60

50

40

316L

30

20

100

160 1600

1000

Always flush the iSave with fresh water at
operation stop in order to minimize the risk of
crevice corrosion.

Duplex

Super Duplex

10 000

16000

100 000

160000

CI
ppm

NaCI

-

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521B14 64 | DKCFN.PD.003.4B.02 | 2018 .05

Data sheet | Energy Recovery Device | iSave 21 Plus and iSave 40

6. Noise level The noise level for the iSaves is measured at max.
speed, a pressure of 80 barg and a booster
pressure of 5 bar. Since the iSave is mounted on a
bell housing and electric motor, the noise level
can only be determined for the complete unit
(system).

It is therefore important that a horizontal iSave
unit is mounted correctly on a frame with
dampeners to minimize vibrations and noise.
We recommend to mount a vertical iSave directly
to the floor with bolts. It is also strongly recom­mended to use high-pressure flexible hoses
between the hard piping in the RO-plant and the
iSave or to use multiple connections with
Victaulic clamps.

The noise level is influenced by:
Speed:

• High rpm makes more fluid/structure-borne

pulsations/vibrations than low rpm due to
higher frequency.

Noise level (dB(A) measured for the iSave 21 Plus and 40 at different speed and system pressure.
Booster pressure 3 bar.

iSave 21 Plus iSave 40

barg/psig

rpm

500 60 62 68
1000 69 72 74
150 0 77 78 78

20/290 60/870 80/1160

Pressure:

• High pressure makes more noise than low
pressure.

Mounting:

• Rigid mounting makes more noise than
flexible mounting due to structure-borne
vibrations.

Connections to iSave:

• Pipes connected directly to the iSave make
more noise than flexible hoses due to
structure-borne vibrations.

• Variable frequency drives (VFD):

Motors regulated by VFDs can increase noise
level if the VFD does not have the right
settings.

barg/psig

rpm

800 73 77 78
1000 76 79 81
120 0 78 82 84

30/435 60/870 80/1160

7. Filtration

It is important that the incoming water is filtered
properly to ensure optimum service life. A true
graded density, melt-blown depth filter cartridge
rated at 3 μm is therefore recommended.

It is important with selection of a proper filter
housing to ensure good cartridge end sealing.
If there is a high risk of water by-pass it is
recommended to use a second stage filter
solution.

As the various filters on the market differ greatly,
Danfoss High Pressure Pumps recommends
using cartridges with consistent, reliable
performance and high efficiency and where
fibres are blown continuously onto a central

support core. High Pressure Pumps does not
recommend cartridges requiring any type of
binders or resins.

Filters can be purchased from Danfoss
High Pressure Pumps. Please see section 10.0,
“RO systems with an iSave”, for installation of
filter. For more information on the importance of
proper filtration, please consult our publication
“Filtration” (code number 521B1009), which also
will provide you with an explanation of filtration
definitions and a guidance on how to select the
right filter.

521B14 64 | DKCFN.PD.003.4B.02 | 2018 .05

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