Question: What is priming and why it is necessary
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Mumbai University > Electronics and telecommunication > Sem 7 > Applied Hydraulics

Marks: 08

Years: MAY 2016

The work done by the impeller per unit weight of liquid per sec is known as the head generated by the pump. Head generated by the pump as $\dfrac 1g Vw_2 U_2$ metre. This equation is independent of the density of the liquid, This means that when pump is running in air the head generated is in terms of metre of air. if the pump is primed with water, the head generated is same metre of water. But as the density of air is very low, the generated head of air in terms of equivalent metre of water head is negligible and hence the water may not be sucked from the pump. To avoid this difficulty priming is necessary.