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12. Checking of operation
Check the following at suitable intervals:
•
Flow and pressure.
•
Current consumption.
•
Pressure drop over the prefilter.
Replace the filter element when "clogged filter" is indicated.
•
Whether the motor ball bearings are worn.
•
Whether the shaft seal is leaky.
The shaft seal is lubricated by the pumped liquid. Small
quantities of liquid are therefore drained via the drain hole in
the coupling housing.
•
Whether the noise level has changed.
It is recommended to write the operating data in the log book
supplied with the pump. The data can be useful for maintenance
purpose.
13. Maintenance
The BMP pump requires no periodic maintenance.
It is recommended to inspect the pump once a year.
14. Motor bearings
Under optimum operating conditions, the operating life of the
motor ball bearings is approx. 20,000 operating hours. After that
period, the bearings must be replaced. The new bearings must be
filled with grease.
Grease type, see motor nameplate.
15. Automatic monitoring devices
15.1 Level switch
Systems supplied from a water tank must be fitted with a level
switch which switches off the electricity supply to the pump if the
water level gets too low.
15.2 Thermal sensor
It is recommended to install a thermal sensor which switches off
the electricity supply to the pump if the water temperature
exceeds 50 °C (122 °F).
16. Periods of inactivity
In the case of periods of inactivity exceeding
•
1 month for BMP and BMP-N and
•
6 hours for BMP-R,
it is important to flush the system through with clean fresh water.
Note: Fill the pump with Grundfos motor liquid, type SML-2, in
periods of inactivity exceeding 1 month.
16.1 Flushing of pump
Disconnect the suction pipe from the water supply. The pump will
be emptied through the suction pipe.
When the pump is to be started again, the venting procedure in
section
10. Start-up
must be followed carefully.
The pump must run during the flushing procedure.
Flushing can for instance be effected through small quick-
couplings or gate valves (not supplied with the pump) fitted either
side of the pump.
Flush the pump for at least 2 minutes.
16.2 Transport and storage
Note: During transportation and storage, the BMP pump must
never be preserved with liquids which are aggressive to the pump
materials.
In periods of inactivity exceeding one month, fill the pump with
Grundfos motor liquid, type SML-2, to prevent corrosion. This
liquid is frost-proof down to -20 °C.
Note: Never just drain the pump!
For further information on anti-freeze liquids, please contact
Grundfos.
16.3 Frost protection
Recommended procedure:
1. Disconnect the water supply to the pump/system.
2. Drain the pump by removing the lower drain plug. Fit and
tighten the plug when the pump has been drained of liquid.
3. Connect the suction port (I) to a container with anti-freeze
liquid. Connect one end of a hose to the discharge port (O)
and the other to the container.
4. Briefly start and stop the pump.
Note: The pump must not run dry.
5. Drain the pump of anti-freeze liquid by removing the lower
drain plug. Fit and tighten the plug.
The pump is now protected against internal corrosion and frost.
Storage temperature:
-20 °C to 70 °C (-4 °F to 158 °F) (factory-filled with anti-freeze
liquid).
17. Service
Note: If a pump has been used for a liquid which is injurious to
health or toxic, the pump will be classified as contaminated.
If Grundfos is requested to service the pump, Grundfos must be
contacted with details about the pumped liquid, etc. before the
pump is returned for service. Otherwise Grundfos can refuse to
accept the pump for service.
Possible costs of returning the pump are paid by the customer.
However, any application for service (no matter to whom it may
be made) must include details about the pumped liquid if the
pump has been used for liquids which are injurious to health or
toxic.
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