Self-priming operation of gear pumps
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A gear pump is used to transport heat transfer oil in underground tanks; the self-priming height is approximately 4 meters. Is it necessary to fill the pump before starting it up? Also, should a foot valve be installed on the suction pipeline?
Of course, the pump needs to be filled; it is the liquid that enables negative pressure to be created for self-priming
This post was last edited by gs8848 on 2019-8-20 at 15:27. Gear pumps have a self-priming capacity of 4 to 5 meters; when starting them for the first time, it is necessary to fill the pump and remove air from it, which is why a foot valve is also required.
Of course, the pump needs to be primed; it would be even better if a buffer tank could be installed before the pump inlet to facilitate priming.
There must be liquid in the pump before starting; although gear pumps have the ability to operate under dry conditions, it is necessary to prevent dry running in order to avoid excessive wear of the meshing surfaces.