When the centrifugal pump is not primed ( filled with liquid ) before starting, the air pocket inside the pump case may give rise to formation of vortex and discontinuity of flow  those lead to make noise, vibration and damages to the impeller. Priming is done by pouring liquid in to pump casing ( when pump is not running ) through a funnel and air will be displaced through an air vent provided on pump case. The formation of air pocket inside casing can be avoided by following methods: 1 – Installation of pump below the suction level 2 – … Continue reading PUMP PRIMING (Notes)