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Positive displacement pumps must not have their delivery restricted because they displace a constant volume. Their NPSHA can be increased by reducing the length of suction piping. Centrifugal pumps need priming to move liquid from the impeller eye to create suction pressure. Double entry centrifugal pumps have a lower NPSH requirement. Positive displacement pumps are used for oil/water separation because they do not change droplet size.

Author

simitzu

Language

EN