Sprinkle & Trickle Irrigation Lectures Page 59 Merkley & Allen Lectur6Econome ic Pipe Selection Method I. Introduction •The economic pipe selection method(Chapter 8 of the textbook) is used to •Witdecreases, causing a corresponding decrease in friction loss ••Hobalance fixed (initial) costs for pipe with annual energy costs for pumping h larger pipe sizes the average flow velocity for a given discharge This reduces the head on the pump, and energy can be saved wever, larger pipes cost more to purchase totalCostPipe Size (diameter)Energy costs = annualized fixed costsfixedo•osts, compare with annual energy (pumping) costs •We can also graph the results so that pipe diameters can be selected according to their maximum flow rate •We will take into account interest rates and inflation rates to make the comparison •onomics” problem, specially adapted to e•. Determine the annual energy cost of pumping minimumt talenergyTco balance these costs and find the minimum cost we will annualize the fixedThis is basically an “engineering ecthselection of pipe sizes This method involves the following principal steps: 1. Determine the equivalent annual cost for purchasing each available pipe size 2
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