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Centrifugal pump head Complete understanding explained in this blog read it carefully for clear this term.

1. If we increase or decrease level of suction tank then Head will be change?
3. If you have suction reservoir which level is below impeller eye then How to calculate Total Head of Pump?
4. If you have pump which produces 30 meter head will it actually work in 30 meter height?

Head is the height at which pump can deliver water.

1: If we increase or decrease level of suction tank then Head will be change?

Yes
If we increase suction tank level Head will be increased.
If we decrease suction tank level Head will be decreased.

When suction tank level is higher pump suction pressure will also raise.
This will result in higher Head.

Total head refers to total water lift
from Suction tank highest level
to water

Height of water in discharge line.

Height of water in suction line.

3. If you have suction reservoir which level is below impeller eye then How to calculate Total Head of Pump?

Pump will be Produce same Total head.

But reduction in Hd Discharge head.

Because reduction in Hs Suction head.

Pump have to work up lift water which consumes energy.
Rest energy will produce Hd Discharge head

In above example pump will produce Zero flow with discharge pressure.
This is called Shut off Head.

When discharge flow is increasing Pressure is reducing.

Detailed study on Flow vs Discharge pressure is available in
It is not advisable to run pump at zero flow for long time. Pump will be heated and no heat release due to zero flow.

4. If you have pump which produces 30 meter head will it actually work in 30 meter height?

No.

It will not working