Submersible Motor Pumps (150 mm and above)
9
11.2 Pump
Pump fails 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
• Unavailability of power. Check the line.
• Defective motor winding, cable and starters. Repair / replace the defective parts.
•
Coupling / motor shaft worn out. Take out pump-set for repairing of the damaged
Motor runs while pump remains stationary. parts.
• Pump is silted up.
Clean the suction casing, Impeller, Stage casing
and non return valve - (1).
•
Pump set broken away from the riser pipe as a
Consult Installer.
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 an excessive discharge Open discharge valve to attain desired flow.
pressure. Reduce no. of bends, increase the pipe size.
•
The pump delivers higher flow of water against low Regulate discharge valve till the duty flow is
discharge pressure. attained.
• Leakage in pipes. Change the pipe.
• • • Excessive wear of pump internal. Replace the worn-out components - (1).
• • • Closed riser pipe.
Replace defective length of riser pipe with new
gasket.
• Discharge pipe coated with depositions.
Clean the pipe and remove the deposition or
Replace the pipe.
• Incorrect installation. Consult Installer.
• Loose assembled parts Tighten the fasteners.
Ensure the operating parameters with respect to
• Positive suction head is too low specified duty parameters and the correctness of
submergence as specified.
(1) Consult KSB
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