![background image](http://html1.mh-extra.com/html/danfoss/mpe-70/mpe-70_operating-manual_3569335015.webp)
Operating guide |MPE 70
15
180R9426 | AQ367027814446en-000801 | IOM MPE 70 | 08.2022
6.5 High pressure remains after
shutdown
The HP line of the RO system can remain
pressurised for a long time after shutdown.
If more rapid system depressurisation is re-
quired, the system should be bled through a
suitable valve.
Always check the pressure in the
high-pressure lines before making
service in the HP lines or pressurised
equipment.
6.6 CIP or membrane cleaning
During CIP cleaning the flush water coming
out of the membranes may consist of a large
amount of suspended inorganic
particles. It is important to assure that
these particles must not enter the
MPE 70. After CIP Cleaning the system
should be flushed.
6.2 Air bubbles
Large bubbles in a pressurised RO system
can result in damage to piping and
equipment. All air must be bleed from both
the LP and HP before the RO system is
pressurised. Special consideration should
also be given to air bubbles in feed flow,
continuously fed into the HP pump and MPE
70 could cause increased wear.
Following the start sequence of the seawater
intake pumps water must be flushed though
valves and/or brine outlet valves to ensure
constant water flow with no air or particles
entering the RO system.
Booster pumps will be started first fol-
lowed by the MPE 70 and then the high
pressure pumps (always in that order).
The control valve Pos 15 will open slowly.
Control loop no. 2 is activated to reach the
setpoint value of the design flow. The flow
will be read in flowmeter (12). During this the
system bleed valves can remain open.
The Booster pumps is started by the con-
trol loop no. 3. Once all return flows from
Booster pumps have been stabilized and all
the air have been removed, the bleed valves
can be closed and the MPE 70 will be started
through control loop no. 4. During this the
the system bleed valves remain open until
system have been bled.
When the bleed valves have been closed
the high Pressure pump can be started and
the recovery rate can be confirmed by the
flowmeters as described:
The recovery rate can be calculated by the
permeate flowmeter Pos 17 and the flow
going into the Membrane. The flow to the
membranes can be calculated from the two
flowmeters pos 1 and pos 29.
Recovery Rate = (17) / (1+29)
6.3 Start-up sequence
6.4 Shut-down sequence
When the high-pressure pump is shut
down the shutdown sequence starts. When
the high-pressure pump flow measured
at flowmeter (1), is lower than a designed
flow value. The Booster pump can be shut
down once the osmotic pressure have been
reached. The MPE 70 will shutdown after the
booster pump.
After the Booster pump and the MPE 70
have been shut down the seawater intake
pumps can be turned off.
Summary of Contents for MPE 70
Page 25: ...Data sheet Energy Recovery Device MPE 70 hpp danfoss com...
Page 53: ...Parts list Energy recovery device MPE 70 hpp danfoss com...
Page 58: ...Danfoss DCS im 2022 08 AX367028596447en 000301 58...
Page 59: ...M a n u a l Electric Motors Motor Manual hoyermotors com...
Page 63: ...63 180R9426 AQ367027814446en 000801 IOM MPE 70 08 2022...