Design guide | Membrane cleaning of the RO-system with iSave ERD
54
180R9357 | AQ265943679828en-00100
2
IOM iSave 50 - 70 | 0
3
.202
3
7. Feed the cleaning solution at high flow into
the “full flow cleaning” adapter (7). The high
flow rate flushes out the foulants removed
from the membrane surface by the cleaning.
8. Flush RO permeate or deionised water into
the “full flow cleaning” adapter (7).
Flush out the cleaning solution.
It is essential that the water used for the final
pre-flush is pre-filtered to a level described
in the datasheet.
9. Open valve (9) and continue flushing.
The iSave(s) may start to rotate backward –
this is OK.
10. When flushing is finalised – assure that no
foulants remain in the piping or valve (9).
11. Close the high pressure “full flow cleaning”
valve (7) and close valve (16 and 28).
12. Open valve (27)
Media filter
M
Permeate
iSave
F
F
F
Flowmeter
VFD
M
HP in
HP out
VFD
M
HP in
HP out
VFD
Fresh water
permeate flush
Full flow
cleaning/CIP
6
7
17
8
9
27
15
13
10
11
11
12
19
Filter
3 micron
nominel
Filter
10 micron
absolut
Drain
4
18
5
M
4
18
VFD
LP in
20
F
*
*
Second stage filter:
If recommended housing design and cartridges are not used, a second stage filter is required
1
21
2
PS
PI
PS
PI
PS
14
PI
PI
PI
PI
PI
3
A
B
C
22
22
PS
24
23
23
25
25
26
26
16
CIP
28
Below procedure is according P&ID no 2.
1. Stop the high-pressure pump(s) (4), and stop
the iSave (11).
2. Stop the seawater supply pump (A).
3. Disconnect pipe in joint (9) and connect the
pipe to low pressure “Full flow cleaning”
joint (16).
4. Plug pipe in joint (9).
5. Close valve (27) and open valve (28)
6. Pump mixed cleaning solutions through valve
(7) to the vessel at conditions of low flow rate
and low pressure to displace the process
water. Use only enough pressure to
compensate for the pressure drop from feed
to concentrate.
The pressure should be low enough that
essentially no or little permeate is produced.
A low pressure minimizes re-deposition of dirt
on the membrane. Dump the brine/
concentrate to prevent dilution of the
cleaning solution.
7. Recycle: After the process water is displaced,
cleaning solution will be present in the
concentrate stream. Recycle the cleaning
solution from the piping to the cleaning
solution tank.
8. Turn of the pump and allow the elements to
soak.
9. Feed the cleaning solution at high flow into
the “full flow cleaning” adapter (7) on the
feed side of the membrane. The high flow rate
flushes out the foulants removed from the
membrane surface by the cleaning.
P&ID no. 1
Summary of Contents for iSave 50
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