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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