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1-5 - Lecture 6 Economic Pipe Selection Method I...

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Sprinkle & Trickle Irrigation Lectures Page 59 Merkley & Allen Lectur 6 Econom e ic Pipe Selection Method I. Introduction The economic pipe selection method (Chapter 8 of the textbook) is used to Wit decreases, causing a corresponding decrease in friction loss Ho balance 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 total Cost Pipe Size (diameter) Energy costs = annualized fixed costs fixed o 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 minimum t tal energy T c o balance these costs and find the minimum cost we will annualize the fixed This is basically an “engineering ec th selection 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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