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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 ,-aw Cover <br /> water use rate. .. i t <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 • ` T°0°°" <br /> gallons per hour(45 gpm)to prevent build-upofpressure in dropbox. . L Ler««alalll.Nark mere. <br /> low. <br /> Leerily Sena Leper ��Nee I.r«elle;«.»...a.«ad <br /> • . vire redo pawl <br /> Pressure Distribution ,:�"°rst 1m'pmpou ti'«w'°"U""i""""► <br /> 3. a. Select number of perforated laterals 3 `4i.•Piw. ,.-a Leaf le 1.EM. <br /> b. Select perforation spacing= 7 ft. <br /> �°M F"i4"°` ',� °" a1`"" <br /> C' Perl«.l"m Leaded H <br /> c. Subtract 2 ft.from the rock layer length. c".n Send Ler., Batten@ of Waal <br /> l s".aiu-2ft.= S. ft. <br /> • laglnel Sell Properly Swilled <br /> Balers Pbcing Send Lger <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= S 7 ft.+�-ft.= /7 spaces <br /> TABLE OF P);RM1tAT1ON DISCttARCI1S IN CI'M <br /> C. 17 spaces+ 1 = I c( perforations/lateral <br /> • 1. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> total number of perforations. _ <br /> =rig x pAl teal= SLl perforations. rn lea <br /> 1.0a 036 0.74 <br /> g. - x;1.....-744 <br /> =...q.1)gpm. <br /> 13 0.69 0.90 <br /> 2.0b 0.80 1.04 <br /> 2.5 0.89 1.17 <br /> SELECTED PUMP CAPACITY 1'>'' C.) gpm 3.0 0. 1.28 <br /> 4.0 1.11 33 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between pumpand point of discharge. aUse 1.0 foot of head for residential systems. <br /> g bUse 2.0 feet of head for other establishments <br /> c 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 Length <br /> I <br /> a. Enter friction loss table with gpm and pipe diameter. I <br /> ":\aint of Discharge <br /> Read friction loss in feet per 100 feet from table. <br /> F.L._ a.(ei4 ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump 4v <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= <br /> 1.5 inch 2.0 inch 3.0 inch <br /> a C?,A x 1.25= ;),..c.L feet gpm Friction loss per 100 ft of pipe <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 ) .(-•'f +100 c r) 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. 20 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> / ,r + S- ''+ ') 30 5.23 1.55 0.23 <br /> (1) (2) =($c) 7.90 2.06 0.30 <br /> 40535 11.07 2.64 0.39 <br /> 45 14.73 3.28 OAS <br /> TOTAL HEAD -(-7 feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> Pump selection <br /> 1. A pump must be selected to deliver at least Li D gpm (Step A) <br /> with at least a,') feet of total head (Step B). . <br />