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--,. <br />\ r <br />) <br />I <br />) <br />PUMP SELECTION PROCEDURE <br />A. Determine pump capacity: <br />Gravity Distribution <br />1. Minimum suggested is 600 gallons per hour (10 gpm) to stay ahead of <br />water use rate. <br />2. Maximum sugges~elivery to a drop box of a home system is 2,700 <br />gallons per ho~o 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 fl from the rock layer length. <br />Roc:Jti. ~ -2 ft. = ___ feet. <br />d. Det~e 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.~ x pcns)t.,..-.J = __ perforations. <br />g. 751!"' X gpcvp<rl= __ gpm. <br />SELECTED PUMP CAP A CITY L) £ gpm YYJ 4 J.-. <br />B. Determine head requirements: <br />1. Elevation difference between pump and point of discharge. <br />:l__c?-, 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 />__, feet <br />Friction loss <br />a. Enter friction loss table with gpm and pipe diameter. <br />Read friction loss in feet per 100 feet from table. <br />F.L = :;s, ~~ ft./100 ft of pipe <br />b. Determine total pipe 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 />°Z.C x 1.25 = i l "lS' feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss= ::3 ,;t."tS" x ) ) ~ +100 = LJ <br />Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />~:i.____ + ____ + y <br />(1) (2) (3c) <br />TOTAL HEAD a(..,, feet <br />feet <br />C. Pump selection <br />1. A pump must be selected to deliver at least <br />YS gpm (Step A) with at least ;;\,.lo feet of total head (Step B). <br />YVJA-x... <br />F-17 <br />El-0 PERFORATION OF A PERFORATED LATERAL <br />.._ -AJ l.eo,1 12• lo !dQ• <br />.-...;,=-<;""'-'=a:w...-h--W:,.:.:l!'.!· ot Roca L#'rff <br />Required Perforation Disch~e <br />in gallons per minute (gpm <br />D~e 12 md,pal /4" .,d, pal Head <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 />□Pump <br />Point of Discharge ______ T~so <br />Elevation Difference I <br />~'1.::i.i <br />F-18b <br />1.5 inch 2.0 inch 3.0 inch <br />gpm Fria.iai lea per l 00 ft of pipe <br />10 0.69 0.20 <br />12 0.96 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 />25 3.73 1.11 0.16 <br />30 5.23 1.55 0.23 <br />35 7.90 2.06 0.30 <br />40 11.07 2.64 0.39 <br />45 14.73 3.28 0.48 <br />~-3.99 0.58 <br />55 4.76 0.70 <br />60 5.60 0.82