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PUMP SELECTION PROCEDUiZ~ <br /> <br />A. Determine pump capacity: <br /> Gravity Diatribution <br />1. Minimum suggested is 20 gpm <br />2. Maximum suggested is 45 gpm <br /> <br />Psmssure Distibution <br />3. a. Select number of perforated laterals <br />b. Select perforation spacing = feet. <br /> c. Subtract 2 ft. from the rock layer length. <br /> ~,~.~ ,.y., ~.~o~ - 2 ft. =. feet. <br /> d. Determine the number of spaces between perforations. <br /> Length perf. spacing = __ ft. + __ ft. = spaces <br /> e. __ spaces · 1 = ~ perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. ~,~,r~,s X .p,n,~ra= perforations. <br /> g' ~n~ x ~ = gpm. . <br /> <br /> SELECTED PUMP (~APACITY ~ ~) gpm <br /> <br />Perforation Discharges in GPM <br /> <br /> Head Pertoration diameter <br /> (feet) tmchesl <br /> 7/32 1/4 <br /> 1.0a 0.5O 0.74 <br /> ] 5 0t~9 090 <br /> 2.Ob 0.80 1.04 <br /> <br />a Use 1.0 toot single homes. <br />b Use 2.0 feet tot anything else. <br /> <br />B. Determine head requirements: <br />1. <br /> <br />o <br /> <br />Elevation difference between p]~'np and po~t of ~ge. <br /> <br />If p~pmg to a pressure distribution system, five f~t for pressure <br />required at m~ifold if gravity system, zero. _. <br /> feet ~,t~ ...... <br /> <br />a. Enter friction loss table wi~ gpm ~d pipe di~eter. ~ ............... Read friction loss M feet per 1~ f~t from table (F-14) .... <br /> <br />o <br /> <br />F.L.= ,?.~ ft. /100 ft of pipe <br /> <br /> b. Determine total pipe length from pump to discharge <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss, or use a fitting loss chart (F-15 feet). <br /> Equivalent pipe length - 1.25 times,p~ip,$ length = <br /> ~Tt{~- x 1.25 = ~'lf feet <br />c. Calculate total friction loss by multiplying <br /> friction loss m ft/100 ft by equivalent pipe length, c / <br />Total friction lo~s = t '~ .~ x ~ '~' +100 = ~ "~ feet <br />Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br /> <br /> (1) (2) (3c) <br /> <br />TOTALHEAD <br /> <br />C. Pump selection <br /> <br />feet <br /> <br />Friction Loss in Plastic Pipe <br />Nominal <br />pipe dia. <br />Flow Rate <br />gpm <br /> <br /> 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> 40 8.91 2.64 0.39 <br /> · 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.541 <br /> 55 4.76 0.?0 <br /> 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> <br />[ ~ 0 8pm <br /> <br />1. A pump must be selected to deliver at least <br /> <br />, . feet of total head (Step B).I[ <br /> <br />(Step A) with at least <br /> <br /> <br />