Submersible motor pumps (100 mm)
8.2
Pump
Pump falls to deliver the water
Pump delivers insufficient flow of water
Pump does not develop required head / pressure
Pump has vibrations and noise
Possible Causes
Remedies
•
Power is not available
Check the line
•
Defective motor winding, cable and starters.
Repair / replace the defective parts
•
Coupling / motor shaft worn out.
Take out pump-set for the repairing of damaged
Motor runs while pump remains stationary.
coupling.
•
Pump is silted up
Clean out the suction casing, Impeller, Stage
casing and non return valve - (1)
•
Pump set has broken away from the riser pipe
Consult Installer
as a result of corrosion
•
•
Rotational speed is too low
Check supply frequency and increase the
voltage up to tolerance limit as shown on
name plate
•
Pump delivers against as excessive discharge
Open discharge valve until the desired flow is
pressure.
attained. Reduce no. of bends, increase the
pipe size.
•
The pump delivers higher flow of water against
Close discharge valve until the duty flow is
low discharge pressure.
attained.
•
Leakage in pipes
Change the pipe.
•
•
•
Excessive wear of pump internal
Replace the worn-out components - (1)
•
•
•
Closed raiser pipe
Replace defective length of raiser pipe with new
gasket
•
Discharge pipe coated with depositions
Clean the pipe and remove the deposition or
Replace the pipe
•
Installation causes heavy vibrations
Consult Installer
•
Abnormal drop in water level during operation /
Make the use of compressor pumps to get the
Insufficient yield
yield
(1) Consult KSB
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