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F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity- <br /> Gravity <br /> Gravity Distribution <br /> 1. Minimum suggested is 600 gallons per hour 00 gpm)to stay ahead of = »„w,mak c. <br /> water use rate. UVW N hr.o---..a <br /> .�. ..,...,wa.I <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 ��a��»a,,.,..,•ia <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. _.,;p, '_M`a«w." I1.E!K <br /> Pressure Distibution T .a. saw I,,. <br /> F-Iowa "�'«" <br /> B.t,w a 1.LA-1 <br /> 3.a. Select number of perforated laterals 3 <br /> b. Select perforation spacing= 73 feet. <br /> C. Subtra 2 ft.from the rock layer length. <br /> -2 ft.= c. feet <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= (o to ft.-I- 3 ft.=a2 spaces Required Perforation e <br /> e. 'az spaces+1= aQ perforations/lateral in gallons per Minute(9PM <br /> f. Multiply perforations per lateral bnumber of laterals to �I HB ,e A.a <br /> Pd t total number of perforations. • x _ perforations. Net) <br /> �2 "d°'` <br /> g. x a P•�_ gpnL <br /> SELECTED PUMP CAPACITY 1.0a 0.56 0.74 gpm 2.Ob 0.80 1.04 - <br /> .04 -BB. <br /> .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 /> _ 1::� _feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity stem,zero. <br /> �S 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.= 2,U, ft./100 ft of pipe TTio// <br /> b. Determine total pipe length from pump to discharge Elevation Diffetencel <br /> point. Add 25 percent to pipe length for fitting ptunp �y <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> JJ x 1.25= 31-.� feet 1.5 inch 2.0 inch 3.0 inch <br /> c. Calculate total friction loss by multiplying gpm FriakmI=per I00Rofpipe <br /> friction loss in ft/100 ft by equivalent pipe length. 'l 10 0.69 0.20 <br /> Total friction loss= ",► a. x +100= `6 feet 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 + ' _+ 25 3.73 1.11 0.16 <br /> (1) (2) (30 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 3 feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> s60 s2C Pump selection 60 o <br /> D'A <br /> l Z01 1. A pump must be selected to deliver at least <br /> _gpm (Step A)with at least ?Q feet of total head(Step B). <br />