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PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribudon <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perfontion Discharges in GPM <br /> Head Perforation diameter ' <br /> Pressure Distibution Eeet inches <br /> 3. a. Select number of perforated lateraLs . �/32 1/a <br /> b. Select perforation spacing= feet. . 1.Oa o.56 0.74 <br /> c. Subtract 2 ft. from the rock.layer length. ls 0.69 0.90 <br /> Rxk laya�en�th <br /> -2 ft.= feet. . 2ob o.so i.o� <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing= ft.+ 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. y�s x .�= perforations. <br /> g. � x �T�= gpm. <br /> SELECTED PUMP CAPACTTY � gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between ump and point of dischazge. <br /> ��, feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure � �°`'`�"a""`s`�""' <br /> required at manifold if gravity system,zero. °"'"``�°' <br /> _��feet T°nl p'p�1°`�t!' <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. �N„o„�� <br /> Read friction loss in feet per 100 feet from table(F-14). �'�' <br /> F.L.= I 5 5 ft./100 ft of pipe ._ <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 pipe length-1.25 times pi�e length= � <br /> �.S- x 1.25= 9 `� feet Friction Loss in Plastic Pipe <br /> c Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft by equivalent pipe length. Nominal <br /> Total friction loss= I� S r x + � pipe dia. <br /> �_ 100= feet Flow Rate <br /> 4. Total head re quired is the sum of elevation difference, �m 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 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 2 6 0.30 <br /> 40 8.91 264 0.39 <br /> TOTAL HEAD /�_feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C, Pump selection 60 5 bo 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 /> 3v gpm (Step A) with at least �_feet of total hea�i (Step B). <br />