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Pumps | Interview Questions

Pumps | Interview Questions Blog Contains 


1. Why centrifugal pumps are widely used in process industries than positive displacement pumps?
2. When to use gear pumps?
3. When we need pumps in parallel and pumps in series?
4. What is priming in centrifugal pumps?
5. When do you use gear pump?
6. Comparing reciprocating & centrifugal pump
7. What is difference between Pump head & Discharge Pressure? How to convert Discharge pressure into Head?

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1. Why centrifugal pumps are widely used in process industries than positive displacement pumps?

Centrifugal pumps ate widely used in process industries. Because
1) They are simple to construct and operate
2) Installation and maintenance are easy
3) Casing can be made of up variety of materials
4) Noise free operation
5) No need of safety valve at discharge side in case of single stage centrifugal pumps
6) Can handle variety of liquids. The impeller MOC can be altered accordingly.

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2. When to use gear pumps?

When we need to handle high viscous liquids we need gear pumps as they deliver a higher discharge pressure (even up to 200 bars)   than centrifugal pumps. They are used to pump paints, resins, adhesives, pitch. diesel, crude oil etc. They are positive displacement pumps.

3. When we need pumps in parallel and pumps in series?

If we need a higher discharge flow (Q) we have to go for pumps in parallel arrangement. If we need a higher head (H) we need to go for pumps in series

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4. What is priming in centrifugal pumps?


5. When do you use gear pump?

The gear pump is commonly used in the chemical industry for handling high viscosity liquids including molasses, paints, and greases.

6. Comparing reciprocating & centrifugal pump


Centrifugal pump
Reciprocating pump

simple in construction



Complicated in construction



Requires less floor are


Suitable for large discharge






Less efficiency
High efficiency

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7. What is difference between Pump head & Discharge Pressure? How to convert Discharge pressure into Head?



 

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