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The Practical Pumping Handbook ..........................................................................

Tank 'B'

Total
Static
Head
Tank 'A'

|1

Figure 3.4: Static head entering bottom of the tank

can be measured between the free surface of the liquid in Tank 'A', and
the highest level of the discharge line.
In another system (Figure 3.4), where the pump discharges into Tank
'B' at a point below the liquid level in that tank, the Total Static Head
in the system is the vertical distance from the free surface of the liquid
in Tank 'A' to the free surface of
the liquid in Tank 'B'. It should H
be noted that this also applies,
even when the suction source is
lower than the pump. This will be
discussed in greater detail in
Chapter 4. Static Head

Regardless of the layout of the
system, the Total Static Head is
not a variable of the flow rate, Q
therefore a graph comparing the
two would show up as a straight Figure 3.5: Static head curve
line.

3.3.2 Friction losses and friction head
Friction is the rcsistancc to flow in the piping system and must be
considered for three scparate arcas individually.

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