Danfoss iSave 40 Series Operation Manual page 28

Operation guide | iSave 40
Media filter
A
28
Below procedure is according P&ID no 1.
1. Stop the high-pressure pump (4), and stop
the iSave (11).
2. Stop the seawater supply pump (1).
3. Close valve (9) and open valve (16).
4. Pump mixed cleaning solutions 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.
5. Recycle: After the process water is displaced,
cleaning solution will be present in the
concentrate/brine stream. Recycle the
cleaning solution from the piping to the
cleaning solution tank.
10.3.2 P&ID no. 1
2
26
B C 3
Filter Filter Filter
PI
5 micron
3 micron 10 micron
nominel
PS
nominel absolut
PI
PI
*
26
1
12
LP in
PI
HP out
PS
21
11
24
iSave
Fresh water
permeate flush
HP in
VFD
23
19
*
Second stage filter: If recommended housing design and cartridges are not used, a second stage filter is required
Below procedure is according P&ID no 2.
1. Stop the high-pressure pump (4), and stop
the iSave (11).
2. Stop the seawater supply pump (1).
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. Open valve (16).
6. Pump mixed cleaning solutions 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
180R9239 | AQ299555093252en-001601 | iSave 40 | 09.2022
6. Turn of the pump and allow the elements to
7.
8. Flush RO permeate or deionised water into
9.
10. When flushing is finalised – assure that no
11. Close the high pressure "full flow cleaning"
22
VFD
4 VFD
22
25
18
5
PI
6
4
PS
25
18
Full flow
cleaning/CIP
7
HP out
11 10
PI
HP in
VFD
14 13
23
20 15
PI PS
7.
soak.
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.
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
Data sheet.
Open valve (9) and flush through the iSave.
The iSave may start to rotate backwards
– this is OK.
foulants remain in the piping or valve (9).
valve (7) and close valve (16).
17
Permeate
Flowmeter
8
9
16
28
CIP
27
Drain
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.
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.