MULTI- STAGE CENTRIFUGAL PUMPS: Multi-Stage Centrifugal Pumps for High Heads, Multi-Stage Centrifugal Pumps for High Discharge

ย MULTI- STAGE CENTRIFUGAL PUMPS

If centrifugal pump consists of two or more impellers, the pump is called a multi-stage centrifugal pump. The impeller may be mounted on the same shaft or on different shafts.ย 

A multi- stage pump is having the following two important functions:

1) To produce a high head andย 

2) To discharge a large quantity of liquid.

If a high head is to be developed, the impellers are connected in series (or on the same shaft) while for discharging large quantity of liquid, the impellers (or pumps) are connected in parallel.


Multi-Stage Centrifugal Pumps for High Heads:

ย For developing a high head, a number of impellers are mounted in series on the same shaft.

The water from suction pipe enters the 1st impeller at inlet and is discharged at outlet with increased pressure. The water with increased pressure from the outlet of the 1st impeller is taken to the inlet of the 2nd impeller with the help of a connecting pipe. At the outlet of the 2nd impeller the pressure of the water will be more than the water at the outlet of the 1st impeller. Thus if more impellers are mounted on the same shaft, the pressure at the outlet will be increased further.

Let n= Number of identical impellers mounted on the same shaft,

๐ป๐‘š = Head developed by each impeller.

Then total Head developed = ๐‘› ร— ๐ป๐‘š

The discharge passing through each impeller is same.

Multi-Stage Centrifugal Pumps for High Discharge:

For obtaining high discharge, the pumps should be connected in parallel. Each of the pumps lifts the water from a common sump and discharges water to a common pipe to which the delivery pipes of each pump is connected. Each of the pumps is working against the same head.

Let n = Number of identical pumpsย arranged in parallel.

Q = Discharge from one pump.

โˆด Total Discharge = ๐’ ร— ๐‘ธ

Multi-Stage Centrifugal Pumps for High Discharge


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