[icedcappucino]

These Pumps produce a head and a flow by increasing the velocity of the liquid that passes through the machine with the help of the rotating vane/ impeller. Pump impeller traps the liquid and accelerates the fluid. The casing of pump is designed to convert the rotation kinetic energy to hydrodynamic energy of flow (pressure). The amount of flow and pressure generated depend on
1. Fine clearances between the impeller and the casing
2. Restriction in the suction of the pump.
3. Internal and external leakages.

So it is very important that the wear rings, mechanical seals/ gland packing. Suction filters are maintained in good order and bearings are well lubricated.
Centrifugal pumps are to be started with closed discharge valve, where ever possible. For Stby centrifugal pumps in ensure that the NRV or flap valve (where provided) are maintained in good order to prevent the reverse flow of the fluids.
Cavitation is one of the most common problem that occurs if the pump is not operated properly especially with negative suction head. Ensure that there is no air/vapour trapped in the pump. Make use of the priming device where ever provided.

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