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The point at which a pump operates
in a given piping system depends
on the flow rate and head loss
of that system. For a given system,
volumetric flow rate is compared
to system head loss on a system
characteristic curve. By graphing
a system characteristic curve
and the pump characteristic curve
on the same coordinate system,
the point at which the pump
must operate is identified. For
example, in Figure 10, the operating
point for the centrifugal pump
in the original system is designated
by the intersection of the
pump curve and the system curve
(hLo).
The system has a flow rate equal to and a
total system head loss equal to DPo.
In order to ˙Vo
maintain the flow rate , the
pump head must be equal to DPo.
In the system described by ( ˙Vo)
the system curve (hL1),
a valve has been opened in the system to reduce the system’s
resistance to flow. For
this system, the pump maintains a large flow rate at a
smaller pump head ( ˙V1)
(DP1).
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