Environmental Engineering Reference
In-Depth Information
141 ft
124 ft
Pump
117 ft
figure 3.3 For Example 3.5.
Static Discharge Head (ft) = Discharge Level (ft) + Static Suction Lift (ft)
Static Discharge Head = 145 ft - 128 ft = 17 ft
Total Static Head (ft) = Static Discharge Head (ft) + Static Suction Lift (ft)
Total Static Head = 17 ft + 7 ft = 24 ft
or
Total Static Head (ft) = Discharge Level (ft) - Supply Level (ft)
Total Static Head = 145 ft - 119 ft = 24 ft
Example 3.5
Problem: See Figure 3.3 to determine total static head.
Solution:
Static Suction Head (ft) = Supply Level (ft) - Pump Level (ft)
Static Suction Head = 124 ft - 117 ft = 7 ft
Static Discharge Head (ft) = Discharge Level (ft) - Pump Level (ft)
Static Discharge Head = 141 ft - 117 ft = 24 ft
Total Static Head (ft) = Static Discharge Head (ft) - Static Suction Head (ft)
Total Static Head = 24 ft - 7 ft = 17 ft
or
Total Static Head (ft) = Discharge Level (ft) - Supply Level (ft)
Total Static Head = 141 ft - 124 ft = 17 ft
3.2.4 friction head
Various formulae calculate friction losses. Hazen-Williams wrote
one of the most common for smooth steel pipe. Usually we do not need
to calculate the friction losses, because handbooks such as the
hydraulic Institute Pipe friction manual tabulated these long ago. This
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