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f_UMI' SElll'TlON 1'.RQCEDUJU: <br />A. Determine pump capacity: <br />Gravity Distribution <br />I Minimum suggested is 600 gallons JX'r hour { 10 gprn) to stay alwad of <br />water US<' rate. <br />2 Maximum suggested for delivery to a drop box of a home system is 2,700 <br />gallons per hour (45 gpm) to prevent build-up of pressure in drop box. <br />Pressure 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 />Rod.Larc-lengtl, -2 ft.= ____ feel <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing= fL + __ 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. utmlo X pcm/I.toil= --perforations. <br />f -,,;,.. X gp=1p<d= __ gpm. <br />SELECTED PUMP CAP A OTY fO ''1 2gpm <br />U. Determine head requirements: <br />1. Elevation difference between ~ump and point of discharge. __ :::\ __ feet <br />2. If pumping to a pressure distribution system, five feet for pressure <br />required at manifold if gravity system, zero. <br />3. <br />4. <br />0 feet <br />Friction loss <br />a. Enter friction loss table with gpm and pipe diameter. <br />Read friction lossin feet per 100 feet from table. <br />F.L -(, J \ .ft./100 ft of pipe <br />b. Determine totalpipe length from pump to discharge <br />point. Add 25 percent to pipe length for fitting <br />loss, or use a fitting loss chart. Equivalent pipe <br />length -1.25 times pipe length = . <br />1'2.0 X 1.25 = 133. feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss= I~~ x I ,I\ +100= J.[) <br />Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />~ + 0 + ~ __ .,____ ---- <br />(I) (2) (3c) <br />TOTAL HEAD -~j _l_feet <br />C. Pump selection <br />feet <br />I 1. A pump must be selected to deliver at least <br />!;'~m (Stc>p A) \<:ith :it 1<',l'-.I LL--fee( of Iola! head (Stc•11 U) <br />I. ____ -------------------------------·~-- <br />I· 17 <br />EMJ POlf~TION Of A l'OlH>RATFU l.ATfRl\t <br />-1 -'" ... L OnttnOI Soll ,-.,.~y Sc.ar1f~ <br />Eklon, PkK:f"O s.ftd Lo,-- <br />Required Perforation ~e <br />in gallons per minute (gpm <br />Discharge 1i1 =d<J><rl 1:. ind\pm He.ad <br />(feet) <br />1.0a 0.56 0.74 <br />2.0b 0.80 1.04 <br />a. Use for single family homes <br />b. Use for all other applications <br />Pipe Length <br />F-18b <br />1.5 inch 2.0 inch 3.0 inch <br />gpm Friaioa loa pa 100 ft oC pip<: <br />10 0.69 0.20 <br />12 0.% 0.28 <br />14 1.28 0.38 <br />16 1.63 0.48 <br />18 2.03 0.60 <br />20 2.47 0.73 0.11 <br />~ 3.73 ..LlJ 0.16 <br />30 5.23 1.55 0.23 <br />35 7.90 2.06 0.30 <br />4-0 11.07 2.64 0.39 <br />45 14.71 3.28 0.48 <br />50 3.99 0.58 <br />55 4.76 0.70 <br />60 5.60 0.82