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Axial  Flow  Pumps
Centrifugal  Pump  Components

Mechanical Science Volume 1 of 2
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CENTRIFUGAL PUMPS DOE-HDBK-1018/1-93 Pumps Mixed  Flow  Pumps Mixed flow pumps borrow characteristics from both radial flow and axial flow pumps. As liquid flows through the impeller of a mixed flow pump, the impeller blades push the liquid out away from the pump shaft and to the pump suction at an angle greater than 90o.   The  impeller  of  a  typical  mixed  flow  pump  and  the  flow  through  a  mixed  flow pump are shown in Figure 8. Figure 8   Mixed Flow Centrifugal Pump Multi-Stage  Centrifugal  Pumps A centrifugal pump with a single impeller that can develop a differential pressure of more than 150 psid between the suction and the discharge is difficult and costly to design and construct. A more economical approach to developing high pressures with a single centrifugal pump is to include multiple impellers on a common shaft within the same pump casing.   Internal channels in  the  pump  casing  route  the  discharge  of  one  impeller  to  the  suction  of  another  impeller. Figure 9 shows a diagram of the arrangement of the impellers of a four-stage pump.  The water enters the pump from the top left and passes through each of the four impellers in series, going from left to right.   The water goes from the volute surrounding the discharge of one impeller to the suction of the next impeller. A pump stage is defined as that portion of a centrifugal pump consisting of one impeller and its associated components.   Most  centrifugal pumps  are single-stage  pumps, containing  only one impeller.   A pump containing seven impellers within a single casing would be referred to as a seven-stage pump or, or generally, as a multi-stage pump. ME-03 Rev. 0 Page 6







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