IES -Operation difficulties in centrifugal pumps (Common Question )
This is common question asked in UPSC ESE regarding centrifugal pump in Assertion-Reason format. Have a look...
a)
Pump fails to pump the
fluid.
Cause & Remedial Measures
1) Improper priming due to leakage of foot
valve or incomplete filling.
Repair or replace the foot valve, prime
completely.
Reduce the head or change the pump
3) Clogging of impeller, suction pipe or
strainer
Clean the suspected part
4) Suction lift may be excessive
Reduce
the height of pump above the sump
5) Speed more than design speed
Connect
another prime mover of higher speed
6) Direction of rotation of impeller
is wrong
Change the direction.
B) Pump does not give the required
capacity
a) Leakage of air through the suction
pipeor through the gland packingStop the leakage
b)
Damage to some parts of the pump bywear & tear Replace the damaged
parts
c) Clogging of impeller passagesClean
the impeller
C) Pump has poor efficiency
a) Higher than design speed Reduce
the speed
b) Low head & higher dischargeReduce
the discharge
c) Impeller touching, the casing orimproper
alignment of shaft Carryout the necessary repair.
D) Pump stops working
-Suction lift is high
-Air entry into Pipe
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