centrifugalpump - WHAT IS CENTRIFUGAL PUMP WORKING...

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WHAT IS CENTRIFUGAL PUMP? WORKING MECHANISM OF A CENTRIFUGAL PUMP ADVANTEGAES AND DISADVANTAGES OF CENTRIFUGAL PUMPS
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Centrifugal pump works on the principle that when a certain mass of liquid is made to rotate along the impeller from the central axis of rotation, it impresses a centrifugal head. It causes the water to move radially outwards at higher velocity and causes the water to rise to a higher level. The motion of water is restricted by casing of pump, it result into pressure build up. In addition , the change in angular momentum of liquid during its fiow reults into increase in pressure head. The steps involved in operation of centrifugal pump are as follows : 1.The delivery valve is closed. 2.The priming of the pump is carried out. Priming involves the filling the liquid in suction pipe and casing upto the level of delivery valve so that no air pockets are left in the system. if any air or gas pockets are left in this portion of pump, it may result into no delivery of liquid by the pump.
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3. The pump shaft and impeller is now rotated with the help of an external source of power like a motor or any other prime mover. The rotation of impeller inside a casing full of liquid produces a forced vortex which is responsible in imparting the centrifugal head to the liquid. It creates a vaccum at the eye of impeller and causes liquid to rise into suction pipe from the sump. 4. The speed of impeller should be sufficient to produce the centrifugal head such that it can initiate discharge from delivery pipe. 5. Now the delivery valve is opened and the liquid is lifted and discharge through the delivery pipe due to its high pressure. Thus the liquid is continously sucked from the sump to impeller eye and it is delivered from the casing of pump through the delivery pipe.
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