GPM
FIGURE 16. Seriesed-pump characteristic and system-head curves.
- Analyze the proposed pumps
To analyze properly the proposal, a new set of curves, Fig. 16, is required. For the pro-
posed series pumping application, it is necessary to establish a seriesedpump curve. This
is a plot of the head and flow rate (capacity) which exists when both pumps are running in
series. To construct this curve, double the single-pump head values at any given flow rate.
Next, to determine accurately the flow a single pump can deliver, plot the system-head
curve using the same method fully described in the next calculation procedure. This curve
is also plotted on Fig. 16.
HEAD
-
FEET
,OPERATING POINT
QF EACH PUMP WHEN
BOTH ARE RUNNING
SINGLE PUMP
OPERATING POINT
SINGLE PUMP
CURVE
SYSTEM CURVE
DESIGN
OPERATING
CONDITION
SERIESED
PUMP CURVE
