Danfoss iSave 21, Руководство пользователя

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Instruction Start and stop of the SWRO with iSave unit
4 180R9213 / 521B1164 / DKCFN.PI.003.F2.02 / 03.2011
4-14 days system shutdown
Long-term system shutdown
1. Run the “1-3 days’ system shutdown” procedure.
2. Supply fresh water to the iSave unit (11) and the SWRO system. Make sure that the iSave unit and
the SWRO system are filled at the same time to ensure optimal flushing.
3. Run the system for 10 minutes while the iSave unit is running, until all seawater is discharged.
NB! If the pressure (10) in “HP in” drops below 3 bars/43.5 psig, the sound will change of the
iSave. This is due to cavitation. “HP in” pressure between 1-3 bars/43.5 psig is acceptable for
less than 10 minutes within a period of 6 hours. Also see datasheet for iSave.
If possible run the iSave at maximum 750 rpm.
4. Stop the iSave unit (11).
5. After minimum one minute delay, stop fresh water supply.
For a long-term shutdown period, the SWRO system including the iSave units must be thoroughly
flushed with fresh water to remove any salt. Run the “1-3 days’ system shutdown” procedure.
Further, any biological growth should be prevented.
Make a final flush of the iSave unit with the same solution used to preserve the SWRO membranes.
Flush both the high-pressure and low-pressure sides of the iSave (11). The high-pressure flush is
performed by circulating the solution through the iSave unit and the membranes by rotating
the iSave unit.
NB! If possible run the iSave at maximum 750 rpm.