Calculating Horsepower Requirements and Sizing Irrigation ...

recommended for different ID (internal diameter) pipe sizes using the 5 ft/s rule. Many friction loss tables give both the friction loss and velocity for any given gpm and pipe size. Velocity (V) in feet per second (ft/s) can be calculat-ed based on the flow rate in gallons per minute (gpm) and pipe internal diameter in inches as: (equation 4 ... ................
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