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9 <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minunum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution feec inches <br /> 3.a. Select number of perforated laterals �/32 1/4 <br /> b. Select perforation spacing= feet. 1.oa o.56 o.�a <br /> c. Subtract 2 ft. from the rock layer length. 1.5 0.69 0.90 <br /> R��aY����g�-2 ft. = feet. <br /> 2.06 0.80 1.04 <br /> d. Determine the number of spaces between perforations. a Use i.o Eooc single homes. <br /> Length perf.spacing= ft.= ft. = spaces <br /> b Use 2.0 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 perforarions. �� x ��5�7= perforations. <br /> $• T. X�m,a��r= SPm. <br /> SELECT'ED PUMP CAPACITY 3S gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> �feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure S°�'�a°,�^�Sys�u^ <br /> required at manifold if gravity_sy_stem,zero. . Q;°'":'�: <br /> �-' feet Total pipe lmgth <br /> 3. Friction loss <br /> a. Enter frichon loss table with gpm and pipe diameter. � � n�,,;��,� <br /> Read friction ss in feet per 100 feet from table(F-14). P`� <br /> ------- -- - <br /> F.L. _ • ft./100 ft of pipe <br /> .._....-�---..... . . <br /> b. Determine total pipe length from pump to discharge --"'-'""'"-'""""----""-""'""--""'" <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pip�ength-1.25 times p p length= <br /> 6 X 1.25=��feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by mulhplying Nominal <br /> friction loss in ft/100 ft y equiva e t pipe length. � pipe dia. <br /> Total friction loss=z��x�-100=___,��feet <br /> 4. Total head required is the sum of elevatior.diffe:ence, ���te 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> �' 20 2.47 0.73 0.11 <br /> �+�+ •Z'S 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> � 3�,1 6.96 2.06 0.30 <br /> TOTAL HEAD �feet 8.91 0.39 <br /> � 11.07 . 8 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selecEion 60 5.60 o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be seleFte o deliver at least <br /> �gpm (Step A) with at least/ feet of total head (Step B). <br /> f <br />