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.

If we measure the pressure of Air in duct with the help of Pitot tube attached to manometer (pitot tube) whose one end is in atmosphere and one end is in duct and manometer shows some head whether it is Static head or Dynamic Head or (Total head=Static head + dynamic Head). and if it is total head in which static head is zero then how static head is zero.

2 Answers  

SOMEONE POST THE MODEL APTITUDE QUESTIONS FOR MRF TYRES PLz pLZ pLZ ..Very urgent

0 Answers   MRF,

best tip to increase fuel efficiency with a high powered engine?

1 Answers  

how to calculate heat? i.e one glass water heat how much kelvin?

1 Answers   AVT Natural Products,

Critical speed of turbine means the natural frequency and resonance frequency are matching and cause for vibration and noise. which is the natural frequency. how it reflect in vibration.

0 Answers  

If I import a steam boiler from USA and want to install it in India, will it work ?

6 Answers  

what is mechanical engineering?

6 Answers  

what is the use of offset follower in cam? why and where we have to use this type of follower?

6 Answers   College School Exams Tests, Ispat, Jawaharlal Nehru Technological University JNTU, Tata Motors,

What are carvings in Ajanta Caves? a.Mahabarath b.Ramayana c.Jataka Tales d.Upanishads

1 Answers   HAL, LLB,

Define Grashof number and its significance?

0 Answers   John Deere,

how you will syncronised the dg sets manually

0 Answers  

difference between a tower and vessel

3 Answers