Design guide
Start and stop of the SWRO with iSave unit
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180R9357 | AQ265943679828en-00100
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IOM iSave 50 - 70 | 0
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Below procedures are general guidelines for the
start-up and shut-down functions of SWRO-
systems with the Danfoss iSave Energy Recovery
Device.
Procedure details may differ depending on the
system design.
The numbers marked in () refer to the diagram
on page 5.
iSave can be both a single iSave and multiple
iSaves in parallel.
General SWRO system understanding with
ISave
• Basically the permeate flow is the same as the
flow from the high-pressure pump.
• The HP concentrate flow into iSave HP-in and
HP seawater-out is determined by the rpm of
the iSave.
• The iSave (s) HP flow determines the recovery
rate (higher rpm on the iSave gives lower
recovery rate and vice versa).
• Flow on the low-pressure side of the iSave is
determined by feed pump and the pressure
control valve LP-out (15) (not by the rpm of
the iSave).
• The flow on the low-pressure side must be at
least the same as on the high-pressure side
of the iSave (LP in flow = HP in flow; this is
called balanced flow).
• Continuously operation:
• To minimize mixing, the flow on the
low-pressure side can be adjusted up to 10%
higher than the high-pressure flow with the
limitation that the flow rate at LP inlet may not
exceed 70 m³/h.
Prior to start-up
High quality water extends the service life of the
whole system.
Both the APP pump and iSave are sensitive to
hard particles.
Before connecting any APP pump or iSave to
a piping system
ALL
pipes must be thorough
flushed with high quality pre-filtered water or
mechanical cleaned.
1. Install all filter cartridges in the system.
2. With the iSave(s) and APP pump(s)
discon-
nected
from the piping, the system must be
flushed in order to remove possible
impurities from the system (pipes, hoses,
membranes etc.).
Flushing must run until the system can be
ensured clean.
3. Connect the iSave(s) and APP pump(s) to
the pipework. The iSave(s) and APP pump(s)
are now ready for start-up.
Starting up the system
1. Make sure that all valves are set in normal
operating positions.
2. Start the seawater supply pump (A).
3. Make sure all pipework is flushed with water.
Vent all air from the system through air valve
(8) and iSave unit (11). After venting, close
valve (8).
At initial start-up also bleed the iSave(s) and
APP pump(s).
Summary of Contents for iSave 50
Page 20: ...Operating guide iSave 50 70 20 180R9357 AQ265943679828en 001002 IOM iSave 50 70 03 2023...
Page 23: ...Data sheet iSave Energy Recovery Device iSave 50 iSave 70 hpp danfoss com...
Page 50: ...Danfoss DCS im 2020 01 180R9213 521B1164 DKCFN PI 003 F8 02 50...
Page 51: ...Design guide Energy Recovery Device iSave Membrane cleaning of RO system hpp danfoss com...
Page 56: ...Danfoss DCS im 2017 09 521B1165 DKCFN PI 00 G6 02 56...
Page 57: ...ro solutions com Design Guide APP pumps and iSave overload protection hpp danfoss com...
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Page 75: ...Parts list Energy recovery device iSave 50 70 hpp danfoss com...
Page 86: ...86 Danfoss DCS im 2021 03 180R9392_AX299849991270en 000701...
Page 87: ...M a n u a l Electric Motors Motor Manual hoyermotors com...
Page 91: ...91 180R9357 AQ265943679828en 001002 IOM iSave 50 70 03 2023...