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PUMP SELECTION PROCEDURE <br /> A. Dete:mine pump capacity: <br /> Gravity Distribution <br /> 1, Ivfinimum suggested is 20 m <br /> 2. Maximum suggested �� Perforatlon Disehuge�in GPM <br /> Head Perforadon diameter <br /> Pressure Distibution feec tncha <br /> 3. a. Select number of perforated laterals 7 32 � a <br /> b. Select perforation spacing= fee� �.oa os6' 0.74 <br /> c. Subtract 2 R. from the rock layer length. 1S o.� 0.90 <br /> 20b 0.80 1.04 <br /> ,wa��,�,�,�e,-2 ft.= feet. ' <br /> d. Determine the number oE spaces between perforations. a Use�.o toot si„gle homes. <br /> Length perf.spacing= it•+ <br /> ft,= spaces b Use 20 feet for anything else. <br /> e, spaces+1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. �. x ��, � = perforations. <br /> S, yas X��- gpm. <br /> SELECTED PUMP CAPACTI'Y .�,�SPm N'�AJL <br /> B.Determine head requiremenb: , <br /> 1, Flevadon difference between pump and point of di.schazge. <br /> �feet <br /> s�ti.,�.,,����, <br /> 2, If pumping to a pressure dis�ibution system,five feet for pressure a,� a. <br /> required at manifold if gravity system,zera �L <br /> feet T°"i aa i"'�n <br /> 3, Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,�. �w.d«+an.� <br /> Read friction loss in feet per 100 feet from table(F-14). �'�' ....._, ., _ <br /> F.L. _ -r,:� �, ft./100 h of pipe _.._....._ ..........--••---•..................ry�i'- <br /> b. Determine total pipe length from pump to discharge <br /> poin� Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length-1.25 times pipe length= <br /> ;�.," x 1.25=�feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by muldplying Nominal <br /> friction loss in h/100 ft by equivalent pipe length pipe dia. <br /> Total friction loss= •��;._X � �I +100=�_feet �o�,g�te <br /> 4. Total head required is the sum of elevation difference, �� 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> a + - +�_ 25 3.73 i.11 0.16 <br /> • (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 206 0.30 <br /> 40 8.91 264 0.39 <br /> TOTAL HEAD �� feet 45 11.07 3.28� 0.48 <br /> -50 13.96 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> �tS gpm (Step A) with at least �feet of total hea�i (Step B). <br /> M�1,>L� <br />