A transmission main is to be sized with flows ranging from 800 to 2500 gpm with an average flow of 1600 gpm. Use the rules of thumb velocities to compart pipe size options and calculate the optimal pipe size using cement lined ductile-iron pipe, energy cost of $0.1 5/kWh, pipe cost of $3.5/ft/in. diameter, pump efficiency 80 percent over a 20-year period.
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