Pump head calculator
Flow rate q (gpm):    
Static head sh (ft)    
Inside diameter d (in)    
Pipe or tube length L (ft)    
Velocity (ft/s) = 5.1
Pipe friction head per 100 ft of pipe (ft/100 ft) = 30.9
Pipe friction head (ft) = 2.5
Pump head h (ft) = 2.5    (static head + friction head)

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