Answer / prof. prafulla hatte

1. Internal Leakages in pumps.
2. Lesser speed of a motor due to electrical power supply
problems.
3. High load on pumps.
4. Chocked output filter.
5. Chocked input filter.
6. External leakages from the pump.
7. Change in viscosity of the fluid.

Answer / sebastian paul

1.In sufficient available npsh
2.Pump is not primed properly
3.Air or vapour, pockets in the liquid on the suction side.
4.Low voltage resulting in lower rpm
5.Required head being higher then the developed head
6.Impeller vanes clogged up
7.Worn out wearings
8.Viscocity of the liquid not as per specification

Answer / jagadesh

1.In sufficient available npsh
2.Pump is not primed properly
3.Air or vapour, pockets in the liquid on the suction side.
4.Low voltage resulting in lower rpm
5.Required head being higher then the developed head
6.Impeller vanes clogged up
7. Chocked output filter.
8. Chocked input filter.
9. External leakages from the pump.

Answer / rajkumar

friction in pipes will affect the discharge

Answer / ravindra

also design defects matter in discharge.if there is bend in
the pipe then losses will be more that affect the
discharge.

Answer / venkat

DUE TO SLIP OCCURED IN THE PUMP

Answer / yesm

also checked the direction of rotation of pump due to
wrong electrial connection.

Answer / madhappan kaliyannan

1.NPSH Issue
2.Pump priming not properly
3.Cavitation issues
4.pump direction
5.Required head being higher then the developed head
6.wearing worn out
7.Defend the fluid viscosity.
9.Suction line may be having hole/leakage.
10. Suction line strainer may be got choke
11. Suction line may be volume reduced ( Because of process fluid, like a scale formation )
12. may be more leakages from pump like gland/discharge line/recirculationline

Answer / hameedwahab

Speed & NPSH(A), NPSH(R). Leakage etc.

Answer / n.bargavi

As the resistance to flow in the internal impeller inlet,
discharge ceases. that s due to high pressure. when the
pressure head is same at two points discharge will be maximum
which means no work is required but as the head increases,
the discharge reduces which means at maximum head, discharge
is zero given by main characteristic curve.

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