The pump curves published by pump manufacturers are for the performance of the pump on water. Some pump manufacturers use a derating factor to correct the head and efficiency of the pump when pumping slurry.
This a subject which has had a lot of controversy and disagreement It is suggested that the method used be left to the manufacturer The method they use works for them.
As a final check, another factor in the selection of the pump size is the entrance or suction velocity The higher the entrance velocity the higher the wear rate will be on the leading edge of the impeller vanes and the impeller eye. Generally speaking, eye velocities below 15 or 16 ft./sec. are preferred. The velocity must be high enough to insure that the slurry and solids reach the impeller eye, but not so high to cause rapid wear.
Now that we have looked at the parameters which affect the selection and sizing of a pump, let’s take a set of conditions that we have derived by the testing and careful analysis of the system or as supplied by the customer to select a pump:
Flow: 4000 GPM – Mill Discharge Service
Head: 100 ft.
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