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PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution ENO PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of �Greu raer <br /> water use rate. T +,+ <br /> 2. Maximum=ggested for delivery to a drop box of a home system is 2,700 <br /> of Geole:file Fabrk(or fau- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. iT L.saga 1W "rleye,a hay e.crave covered <br /> vdfh red.Oehl peDed <br /> Pressure Distribution a< a IIsle pMforop ora led Fbrizomolly <br /> Neer Top <br /> 3. a. Select number of perforated laterals 0r4 P1� M Long Iz•fe Edge <br /> o}n F1el _, of Rock Loyor <br /> b. Select perforation spacing= "- ft. Perforollans L=Iea of <br /> +• flaffae of Wool <br /> c. Sub t 2 ft.from the rock layer length. it cl.aa SWA 1arw <br /> -2ft._,..�ft. .. <br /> ... <br /> taotP Properlyy scalfled <br /> LOW <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing ft.+ .Z ft.= spaces TABLE OF PERFORATION DISCHARGES IN GPM <br /> e. )1L spaces+1= I perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(Inches) <br /> get total number of perforations. 1 <br /> /3. f/e <br /> e x _, perforations. <br /> 1.0a OS6 074 <br /> 1S 0.69 0.90 <br /> $• xA=L gPm' 2 080 104 <br /> 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY 3.0 0.98 1.28 <br /> 8Pm 4.0 1.18 1.47 <br /> 5A 126 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between um and int of discharge. aUse 1.0 foot of head for residential systems. <br /> j pump P�� g bUse ZA feet of head for other establishments <br /> 1 lez' feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> S� feet <br /> 3. Friction loss Pipe mgt <br /> a. Enter friction loss table with gpm and pipe diameter. Point of Discharge <br /> Read friction loss in feet per 100 feet from table. �.c� <br /> F.L.= _ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge P <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18b <br /> length-1.25 times pipe length= 1.5 inch 2.0 inch 3.0 inch <br /> I 1 0 x 1.25= )-'!�0 feet , r"On Im as loo s ora <br /> c. Calculate total friction loss by multiplying 10 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 _ 0.28 <br /> Total friction loss= �x r<J +.100= y feet 14 1.28 .0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> special head requirements,and total friction loss. 18 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> / S + '_e),-+L_ 30 5.23 1.55 0.23 <br /> (1) (2) (3c) 40 11.07 2.64 0.39 <br /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD a feet 50 3.99 0S8 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> C. Pump selection <br /> 1. A pump must be selected to deliver at least D gpm (Step A) <br /> with at least 3ig feet of total head (Step B). <br />