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 ┬áthose 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)