Centrifugal pumps are the industry's most preferred hydraulic pumps. At the heart of the centrifugal pump lies impeller which is the most crucial part of the entire system.

1. Impeller – The Soul Of
The Centrifugal Pump

2. Brief About Centrifugal Pumps
● Centrifugal pumps: Most commonly used and ideal
hydraulic pump.
● Finds its application in the domestic and industrial
facilities.
● Can induce flow or even raise pressure of a fluid.

3. Construction of the impeller:
● A rotating structure with a series
of curved vanes/blades.
● These blades are fitted inside the
shroud plates and immersed in
water.
● The engine or the motor shaft that
the impeller is connected to
produces centrifugal force within
the pump casing.

4. Working of the impeller:
● When the impeller rotates, the fluid surrounding it also
rotates. The water flows out radially through the
centrifugal force imparted by the impeller.
● The pressure and kinetic energy of the water rises at
the discharge side of the impeller because the rotational
mechanical energy is transferred to the liquid.
Continued On Next Page.

5. ● A negative pressure is induced at the eye on the suction
side of the impeller where water is getting displaced.
● The centrifugal pump impeller when works in tandem
with the volute helps to create a partial vacuum and a
low pressure.
● When this vacuum is is maintained it helps to the fresh
water stream to move into the system.
Working of the impeller:

6. ● The centrifugal pump impeller combined with the volute
decides the following:
○ flow of the pump
○ pressure inside the pump and the liquid
○ the solid handling capacity of the centrifugal pump
Working of the impeller:

7. Open Impeller Features
● Can pump liquids containing suspended solids.
● Do not clog easily since they have an external
adjustment.
● This in turn helps in their maintenance and clearance
when the internal parts begin to wear.

8. How to achieve higher efficiency in
centrifugal pumps?
● The front side of the vanes must be set with a clog
clearance.
● Increase the clearance behind the impeller by adjusting
it towards the suction wear plate.
● Regular clearance checks & periodical adjustments
ensures the good performance of the pump.

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Canada. L4W 1C8
Tel: (905) 461- 9617
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