Taking The Product Out Of Operation - Grundfos KP Notice D'installation Et De Fonctionnement

8.8 Taking the product out of operation

The following shutdown procedures will apply for KP, KPV pumps
in most normal shutdown situations. If the pump will be
inoperative for a long time, follow the storage procedures in
section
8.8.3 Long-term shutdown.
8.8.1 General procedure
• Always close the outlet gate valve before stopping the pump.
Close the valve slowly to prevent hydraulic shock.
• Switch off and lock off the power supply to the motor.
8.8.2 Short-time shutdown
• For overnight or temporary shutdown periods under non-
freezing conditions, the pump may remain filled with liquid.
Make sure that the pump is fully primed before restarting.
• For short or frequent shutdown periods under freezing
conditions, keep the liquid moving within the pump housing
and insulate or heat the pump exterior to prevent freezing.
8.8.3 Long-term shutdown
• For long shutdown periods or to isolate the pump for
maintenance, close the inlet and outlet gate valves. If no inlet
gate valve is used and the pump has positive inlet pressure,
drain all liquid from the inlet line to stop the liquid flow into the
pump inlet. If applicable, turn off any external source of
cooling or lubricating fluid to the shaft seals. Remove the
plugs in the pump drain and vent holes, as required, and drain
all liquid from the housing. Remove the packing, if applicable.
• If there will be freezing conditions during long shutdown
periods, completely drain the pump and blow out all liquid
passages and pockets with compressed air. Freezing of the
pumped liquid can also be prevented by filling the pump with
antifreeze solution.
• Rotate the shaft by hand monthly to coat the bearings with
lubricant and impede oxidation and corrosion.
• Follow the motor manufacturer's storage recommendations
where applicable.
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