Noise Level; Filtration - Danfoss iSave 21 User Manual

Data sheet
5. Temperature and
corrosion
6.

Noise level

7.

Filtration

6
Energy Recovery Device / iSave 21-40
Fluid temperature:
Ambient temperature:
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/UN S32750 or the like.
80 º
C
70
60
50
40
30
20
100
160
Storage temperature:
-40°C to +70°C (-40°F to 158°F) – provided that
the pump is drained of fluid and stored
"plugged".
The noise levels for the iSaves are measured at
rated speed, 60 bar, and a booster pressure of
3 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 the iSave unit is
mounted correctly on a frame with dampers to
minimize vibrations and noise. 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:
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.
As the various filters on the market differ greatly,
Danfoss RO Solutions recommends using
cartridges with consistent, reliable performance
and high efficiency and where fibres are blown
continuously onto a central support core.
521B1116 / DKCFN.PD.003.A4.02 / 01.2012
+2°C to +40°C (+35.6°F to 104°F) - dependent on the NaCI concentration
+2°C to +50°C (+35.6°F to 122°F)
Always flush the iSave with fresh water at
operation stop in order to minimize the risk of
crevice corrosion.
Duplex
316L
1000 10 000
1600 16000
Frost protection is required at temperatures
below 2°C. Danfoss recommends to use DOW-
FROST from DOW Chemical Company or Chillsafe
mono propylene glycol from Arco Chemical
Company.
• P ressure. Higher pressure causes higher noise
level.
• T he speed of the iSave. High speed creates
more noise than low rpm.
• Rigid mounting of the iSave generates more
noise than flexible mounting.
• Pipe mounting direct to the iSave increases
the noise level compared to flexible hoses.
System pressure
RPM
800
1000
1200
Danfoss RO Solutions does not recommend
cartridges requiring any type of binders or resins.
Filters can be purchased from Danfoss RO
Solutions. 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.
Super Duplex
CI -
100 000
ppm
NaCI
160000
ppm
30 60
dB(A) dB(A)
83 83
82 85
82 88
80
dB(A)
85
87
89