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PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of ��Orese Co1er <br /> water use rate. . ` rte' y �. <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 s - <br /> Loyer of t1",:N,fabk fer taV- <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. Lawny sane Layer ,,�,,,°,°,.,,,°v er«Mrr gerr.e <br /> _• . win red resin papal <br /> '.,appy 1117Tr,Ia>.tat�• Per,orotion dntad Horisomolyr <br /> Pressure Distribution Mla . N.., rep <br /> 1L <br /> 3. a. Select number of perforated laterals 3 pq nw M Last Iz•t.Ede. <br /> b. Select perforation spacing= .� ft. actin FHIe at Race Leger <br /> r� Pa g \ Perforations Located of <br /> c. Subtract 2 ft. from the rock layer length. Clain sand;Lay.r a°"°'"°' Le'•'°' <br /> > s<LS knell-2 ft._ ft. - <br /> TiOrlelnsl son Properly scarified <br /> Were Placing Sand Layer <br /> d. Determine the number of spaces between perforations. . <br /> Length perf.spacing= 53 ft.+ , ft.=Li .spaces TABLE OF PERPsORATION DISCHARGES IN CPM <br /> e. 17 spaces+ 1 = ) perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(Inches) <br /> et total n9 fiber of perforations. <br /> Is ° x �„S tef,,= . perforations. <br /> n <br /> x aj _I fir' <br /> 1.Oa oS6 0.74 <br /> g. �' x U = 4() m. I IS 0.69 0.90 <br /> • aT gP ll 2.06 0.80 1.04 <br /> 2S 0.89 1.17 <br /> SELECTED PUMP CAPACITY-±0_-gpm 4.0 1.13 3.0 0. 1.28 <br /> 1.47 <br /> 5.0 126 1.65 <br /> B.Determine head requirements: <br /> 1. Elevation difference between pumpandpoint of discharge. aUse 1.0 foot of head for residential systems. <br /> g bUse 2.0 feet of head for other establishments <br /> I K.- 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 I <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. 9 st,o <br /> F.L. = .(vy, ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump <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 /> 1) 0 x 1.25= i c" feet gpm Friction loos 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= 1 3 x 'a. ley +100= Li 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 /> i + .+ Li 30 5.23 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 0.30 <br /> 40 11.07 , 2.64 0.39 <br /> -45 14.73 3.28 0A8 <br /> TOTAL HEAD -.Li 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 4 c gpm (Step A) <br /> with at least_ay feet of total head (Step B). i r , J.1''• <br /> -1 � <br />