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F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: Gree.CON! <br /> Gravity Distribution .Terme; " <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of _ • <br /> Layer el 611.0..1810 Fabric far ear- <br /> water use rate. ,:•.u...., w..r 5Lays .eu wrer of My er urea cavy.. <br /> ' N...e r..e.o...r7 <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 ,. .•?■.. . m1.81a r.rer.'"00""Nor..m.e4 <br /> •• ..e,coo kw Teo <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. • .. <br /> _.l ReLa2 r.Ear. <br /> \ P.Aerelleir Lusted el <br /> Pressure Distibution • teen Saes Law B°.w.a L'""ei <br /> 3.a. Select number of perforated laterals Z <br /> �. v <br /> b. Select perforation spacing= 3 feet. 4.O„""r'$ae P"'" <br /> ° y 'l1e <br /> Beer.Place*Seed Layer <br /> c. Subtract2 ft.from the rock layer length. <br /> Rock l-2 ft.= 4,b feet. <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= -ft.+ _ft.=�_spaces Required Perforation Discharge <br /> e. . Z spaces+1= d' gallons perforations/lateral I m per minute(gpm) <br /> f. Multiply perforations per lateral by number of laterals to //3a 1mA. is age 2 mape4 i „dam <br /> get total number of perforations. ; x e l�= L" perforations. (feet) <br /> g. , x '��pQr=3 p gpm. <br /> 1.0a �i9�� 0.74 <br /> SELEC I W PUMP CAPACITY 3'''1 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 /> 4 feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. <br /> S feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Pipe Length <br /> I I <br /> Read friction loss in feetr 100 feet from table. <br /> Pe Point of Discharge <br /> F.L.= D. (. ft./100 ft of pipe <br /> b. Determine total pipe length from pump to discharge - Elevation Differenc110 <br /> point. Add 25 percent to pipe length for fitting PumpV� <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> 9U x1.25= I i3 feet <br /> c. Calculate total friction loss b lti lyin 1.5 inch 2.0 inch 3.0 inch <br /> Y muP. $ %Pm FriaiaL lm pa 100 ft of pipe <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= *.D..la x I 1 '3 +100= 3 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 /> .73 0.11 <br /> ci + .. + 3 25 3.73 <br /> / 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> 40. 11.07 2.64 0.39 <br /> TOTAL HEAD /Go feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> C. Pump selection 55 4.76 o82 <br /> 1. A pump must be selected to deliver at least <br /> 37 gpm (Step A) with at least 1 to feet of total head (Step B). <br />