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Erschienen in:
1996 | OriginalPaper | Buchkapitel
Installation, Handling, and Operation of Pumps and Pumping Systems
verfasst von : Sam Yedidiah
Erschienen in: Centrifugal Pump User’s Guidebook
Verlag: Springer US
Enthalten in: Professional Book Archive
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When a mixture of gas and liquid is acted on by a rotating impeller, the heavier liquid is thrown outward by centrifugal force, displacing the gas toward the center. Depending on the amount of gas contained in the liquid, this displaced gas fully or partially blocks the inlet to the impeller vanes. In the first case, the pump is not able to deliver any liquid. In the second case, the pump may start to deliver a reduced amount of liquid, provided that it can develop the head required to overcome the resistance of the system. In this case, one of the following may occur: The flow rate increases gradually until it is restored to the expected value; the flow rate decreases gradually until the pump ceases to deliver any liquid; or the pump operates at the same, reduced, flow rate.