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<br />-4- <br /> <br />average flow from 150' to 50' = 50 + 25/2 = 38 GPH = <br />.260 psi for DH 580 hose <br /> <br />average flow from 50' to 0' = 62.5+50/2 = 56 GPH = <br />.532 psi for DH 580 hose <br /> <br />TOTAL 1.065 psi <br /> <br />Friction loss in emi tters : 1 <br /> 12.5 GPH = .038 X 25 = .950 psi <br /> 38 GPH = .007 X 25 = .175 psi <br /> 56 GPH = .008 X 25 = .100 psi <br /> 1.225 psi <br /> <br /> 1.065 psi line loss <br /> 1.225 psi emi tter 1 os s <br /> 2.280 psi total loss <br />Average Head Loss = 2.280/2 = 1.14 ps i <br />Head Gain = 2.5' X .43 psi/ft = 1 .07 ps i <br />Head Loss 1.14 psi - Head Gain 1.07 psi = .07 psi <br /> <br />This difference should not exceed t2 psi in order to obtain the desired <br />15 psi on each emitter.2 <br /> <br />IV. Plan of the Pipe Distribution Network <br /> <br />One should plan the underground distribution network to supply <br />emitter lines of not more than 500 feet long. Longer lines are possible <br />where the fields have steep grades. Design of the Davis Farm started with <br />a 5 HP low-head high-volume pump, Model B 2 1/2 ZPM. From a look at the <br />pump curve, it is apparent that we should not exceed the 73 feet of head. <br />With this in mind, we started at the furthest end of the distribution line <br />with 112 feet of one inch line. By adding the total number of emitters <br />served by the one inch line, we find the flow in the header. By use of <br />friction loss nomograph for plastic pipe one may easily determine the <br />friction loss. For example, average flow in the one inch line was found <br />to be 5 GPM so the friction is 2.5 psi per 100 feet or 2.8 psi per 112 feet. <br /> <br />Ipage 10, Drip-Eze Tech Manual <br />2page 17, Drip-Eze Tech Manual <br /> <br />~701 <br />