Danfoss MPE 70 Operating Manual page 14

Operating guide | MPE 70
6. Operation and
Controls
14
For the startup and shutdown of the MPE
70 the following steps should be followed
for safe operation. The Preferred P&ID and
control loops will be used in the explana-
tions below.
1. Flowmeter
2. Pressure indicator
3. Pressure Switch
4. Motor HP pump
5. Pressure switch
6. Safety valve
7. Plug valve
8. Venting valve
31
9. Plug valve
10. Pressure indicator
11. MPE 70
12. Flowmeter
13. Fresh water permeate flush
1. Flowmeter
14. Pressure indicator
2. Pressure indicator
3. Pressure Switch
15. Flow control valve
4. Motor HP pump
5. Pressure indicator
16. Membrane
6. Safety valve
7. Plug valve
17. Flowmeter
8. Venting valve
18. Check valve
9. Plug valve
10. Pressure indicator
19. Full flow cleaning/CIP
11. MPE 70
12. Flowmeter
20. Frequency converter
13. Fresh water permeate ush
21. Pressure indicator 14. Pressure indicator
15. Controll valve
22. Frequency converter
16. Membrane
17. Flowmeter
23. Frequency converter
18. Check valve
19. Full ow cleaning/CIP
24. Pressure switch
20. Frequency converter
25. HP Hose 21. Pressure indicator
22. Frequency converter
26. LP Hose
23. Frequency converter
24. Pressure Indicator
27. Plug valve
25. HP Hose
26. LP Hose
28. Plug valve
27. Plug valve
29. Flowmeter 28. Plug valve
29. Flowmeter
30. Booster pump
30. Booster pump
31. Media lter
31. Media filter
32. 5 µm Nominal Melt blown lter
33 Filter 10 micron ABS
32.5 μm Nominal Melt blown filter
33 Filter 10 micron ABS
Preferred P&ID
Loop Nº Control reference
1 Pressure transmitter
2 Low pressure inlet flow
3 Booster pump flow
4 Booster pump flow
Fresh water permeate
5
flush
6 MPE 70 flushing
7 MPE 70 flushing
8 MPE 70 flushing
Control loops
6.1 Initial start-up and flushing
It is recommended to disconnect all connec-
tions to the MPE 70 and to thoroughly flush
the piping before the MPE 70 is connected
to the inlet and outlet connections.
Prior to the initial start-up, all piping
associated with the MPE 70 unit should be
thoroughly flushed to assure that no
impurities enter the MPE 70. Inadequate
pre-flushing will strongly affect the life
of the MPE 70 and may lead to its eventual
breakdown.
It is essential that the water used for
the final pre-flush is pre-filtered to a
level described in chapter 6.8.
180R9426 | AQ367027814446en-000801 | IOM MPE 70 | 08.2022
4
26
2
3
4
PI
21 21
33
32
PS
PI
PI
26
1
12
LP in
*
PS
24 HP out
11
MPE 70
13
HP in
VFD
23
LP out
*
Second stage lter: If recommended housing design and cartridges are not used, a second stage lter is
required
Position
Control element
number
21 Seawater intake pumps
12 Control valve
29 Booster pump
29 MPE 70
12 Control valve
12 Seawater intake pumps
29 Booster pump & MPE 70
12 Control valve
Strainers do not eliminate the need for
thoroughly pipe flushing before commis-
sioning.
For more information on the importance
of proper filtration, please consult our
publication data sheet, "Filter solutions for
high-pressure pumps and ERDs", which also
will provide you with an explanation of filtra-
tion definitions and guidance on
how to select the right filter.
VFD
22
25
18
2
VFD
5
22
PI
6 16
PS
25
18
31
7
30
19
29
HP out
20
VFD
MPE 70 11 10
9
PI
HP in
VFD
14
15
PI
23
Position
number
2 barg
-
(29 psig)
15 Design flow
30 Design flow
11 Design flow
Design flow
15
for flushing
Design flow
30 & 11 Design fow
15 Design flow
17
Permeate
8
28
CIP
27
Drain
Set points