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Article: Centrifugal pumps.(Water Supply and Treatment)
- Article from:
- Public Works
- Article date:
- April 15, 1995
CopyrightCOPYRIGHT 1995 Hanley-Wood, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Types
In a radial flow pump, pressure in the discharge is developed principally by the action of centrifugal force. Pumps with mixed flow impellers develop pressure partly by centrifugal force and partly by the lift of the impeller vanes acting on the liquid. The third type, the axial flow, develops most of its pressure by lifting action, having a single inlet impeller.
Impeller shape determines its specific speed (roughly, the speed at which one gpm is discharged against one foot of head). The specific speed from low to high in turn indicates whether a centrifugal pump impeller is radial, mixed, or axial flow design. For a given head and capacity, a low ...