of sections of pipeline between stations vary; making identical pressures
improbable, even when all stations are pumping the same product.
g. Increasing or decreasing pump speed raises or lowers both head
capacity and flow rate as shown in Figure 8. When the pumps in the station
are in series, all the pumps should be operated at about the same speed,
because each pump handles the full stream.
None of the pumps should be
operated at speeds lower than 1,200 RPM except when idling.
Figure 8.
Operating characteristics of 6-inch, two-stage pump: impellers in series
QM5201
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