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what is pump shut off head

Shut-off head is a condition,when a centrifugal pump runs with discharge valve closed.
-When a serviced pump is to be tested for its performance, we are running pump with different discharge condition to ensure that the pump is capable of performing as designed.
-Shut-off head is the maximum head generated by a centrifugal pump with zero flow and relatively less power.
Because it has to overcome very small head up to discharge valve,less frictional losses and inertia loads.
-So, shut off head is a part of the characteristic curves.
Caution:
Do not run the centrifugal pump for a prolonged period in shut-off condition ,or else the liquid will get vaporise and pump will run dry and damaged the important part of the pumps like mechanical seal/gland packing,bearing ,etc.
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