8.2 Preventive maintenance
The preventive maintenance tasks recommended in this section are
common for all systems and for average operating conditions. In
case the operating conditions are unfavourable, the maintenance
tasks must be performed more frequently, and they can vary from
installation to installation, for instance due to unexpected changes
of the raw-water quality.
Check for leaks, noise
or abnormal vibrations
Check thrust bearing
and shaft seal
Lubricate motor
bearings
Replace motor
bearings
BMS hs (with PM motor)
Weekly
No preventive
maintenance required
According to motor nameplate
BMS hs (with AC motor)
BMS xl
BMS hp
Pressure exchanger of BMSX No preventive maintenance required
4)
Use one gasket kit every time a pressure exchanger is opened for inspection.
For further information on maintenance and service, refer to the
separate documents supplied for each component and to Grundfos
Product Center.
9. Starting up after standstill
Follow the normal startup procedure step by step. For greasing of
motor bearings, see the section on motor bearings.
Related information
8.1 Motor bearings
9.1 Frequency of starts and stops
We recommend the following frequency of starts and stops:
• minimum once per year
• maximum 5 times per hour
• maximum 20 times per day.
10. Taking the product out of operation
Before periods of inactivity, take various precautions to protect the
system.
The specific precautions to be taken appear from the table:
Action
Period of inactivity
More than 6
hours
More than 1
month
Flush the pump. x x
Fill the pump with fresh water. x x
Preserve the pump. x
5)
Use the same solution that is used to preserve the membranes.
For more details, see the section on flushing and salinity.
Flush the pumps to prevent stagnant seawater which can
start corrosion inside the pump.
Related information
2.4 Flushing and salinity
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