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' F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: cede. <br /> Gravity Distribution <br /> Tope"1 <br /> 1. Minimum suggested is 600 gallons per hour 00 gpm)to stay ahead ofFalw_ �eNe, k Id tow <br /> water use rate. <br /> .ire..e...„rove., <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 0-t-deIee Ne,uon�h <br /> wa coo Nen. Teo <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. P1ee _At Leee' ,Z•„Edge <br /> . Fred or R-9 LOW <br /> Pressure Distibution Cs.-S.W " P.I'a on<`1-1 od O1 <br /> Bei..,..,L.,.Iai <br /> 3.a. Select number of perforated laterals 3 <br /> S-0- <br /> b. Select perforation spacing= feet. 'Wad�0"So";�1Ne <br /> C. Subtrac 2 ft.from the rock layer length. <br /> ,- -2 ft.=��feet <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= (,�, ft.+ -, ft.= spaces Required Perforation Discha�ge <br /> e. a. spaces+1= D'1% perforations/lateral in g��Per minute(SPr> <br /> f. Multiply perforations per lateral by number of laterals to '2J3ej D s dge mm <br /> get total number of perforations.- x P � = G��i perforations. (feet) �z s ad s <br /> 1.0a 0.74 <br /> SELECTED PUMP CAPACITY gpm 2.Ob 0.80 1.04 <br /> B.Determine head requirements: a.Use for single family homes <br /> 1. Elevation difference between pump and point of discharge. b.Use for all other applications <br /> I �j feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. <br /> feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Pipe Length <br /> Read friction loss in feet per 100 feet from table. Point of Discharge <br /> F.L.= ').Co ft./100 ft of pipe T/c2;-' <br /> b. Determine total pipe length from pump to discharge Elevation Difference <br /> point. Add 25 percent to pipe length for fitting PumpIC-1 <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> I J f- x 1.25= 1<_J feet 1.5 inch 2.0 inch 3.0 inch <br /> c. Calculate total friction loss by multiplying 8Pm F;cucn Io,W 100 ft of pipe <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= / 5-(- x � . h -100= H _feet 10 0.69 0.20 <br /> 12 0.96 0.28 <br /> 4. Total head required is the sum of elevation difference, 14 1.28 0.38 <br /> special head requirements,and total friction loss. 16 1.63 0.48 <br /> 18 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> 1 Ll + < + :5 3.73 1.11 0.16 <br /> (1) (2) (30 30 5.23 155 0.23 <br /> 35 7.90 2.06. 0.30 <br /> 40 11.07 2.64 0.39 <br /> TOTAL HEAD a feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.60 0.82 <br /> 1. A pump must be selected to deliver at least <br /> gpm (Step A) with at least = z,. feet of total head (Step B). <br />