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PUMP SELECTTON PROCEDURE <br /> A. Deteraune pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perfontion Diachuges in GPM <br /> Pressure Distibution Head Perforarion diameter <br /> feet inches <br /> 3. a. Select number of perforated lateraLs � 7/32 �/4 <br /> b. Select perforation spacing= ?•O feet. 1.oa o.56 0.74 <br /> c. Subtract 2 ft.from the rock•layer length. 1.5 0.69 0.90 <br /> �Z- -2 ft._��fee� . 2ob o.so i.oa <br /> xocklaye:�a,�th <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing= (�o ft.+ 3.c� ft.- �.O spaces b Use 20 feet for anything else. <br /> e. ✓�'? spaces+1 = � 1 perforations/lateral <br /> f. Multiply perforations per lateral by_number of laterals to <br /> get total number of perforations. �; x �t: t = (�J perforations. <br /> g. l�. x�m� _�gpm. <br /> SELECTED PUMP CAPACTTY �l ) gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of dischazge. <br /> �_feet <br /> 2. If pumping to a pressure dis�ibution system,five feet for pressure �il�����Sn�� <br /> required at manifold if gravity system,zera a��b��•a� <br /> __�feet Toul pipe la��h <br /> 3. Friction loss <br /> � a. Enter friction loss table with gpm and pipe diameter. ,,�� . ��ati���tt <br /> Read friction loss in feet per 100 feet from table(F-14). p'� <br /> F.L._ �•� ft./100 ft of pipe . :.:�:.:^ <br /> b. Deteraune total pipe length from pump to dischazge ; . . . ------------------------------------- �, <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 pipe length-1.25 times pipe length= <br /> 1'�1 �l x 1.25= 1�_feet Friction Loss in Plastic Pi e <br /> c. Calculate total friction loss by multiplying Nominal P <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= � •�-- x t � ) +lpp=�_feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, Flow Rate 1.5" 2" 3" <br /> special head requirements,and total frichon loss. �� <br /> �_+ � +�_ 25 3.73 �.11 0.16 <br /> ' (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 206 0.30 <br /> TOTAL HEAD o�=, feet 40 8.91 264 0.39 <br /> 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection bo 5.60 o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> 'a`- gpm (Step A) with at least �,�.feet of total hea�l (Step B). <br />