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PUMP SELECTION PROCEDLTRE <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 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 Distribution <br />3. a. Select number of perforated laterals <br />b. Select perforation spacing = ft. <br />c. Stra 2 ft. from the rock layer length. <br />-2ft. =_L(,eft. <br />.'. Determine the number of spaces between perforations. <br />Length perf. spacing = a t` ft. + 7 ft. _ _ spaces <br />e. '�L -D spaces + 1 = perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to <br />get total number of perforations. <br />x . __ perforations. )/-P W <br />:� <br />g• P x � -71, gpm_ <br />SELECTED PUMP CAPACITY -7 gpm <br />B. Determine head requirements: <br />1. Elevation difference betweenmp and point of discharge. <br />pu <br />feet <br />2. If pumping to a pressure distribution system, add five feet for pressure <br />required at manifold <br />feet <br />3. 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. = 0-1- 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 />x 1.25 = Z- feet <br />c. Calculate total friction loss by multiplying <br />friction lass in ft/100 ft by equivalent pipe length. <br />Total friction loss = :� . t. x Z ) 4-100 = I feet <br />4. To!al head required is the sum of elevation diffc-encc, <br />special head requirements, and total friction loss. <br />S 1 <br />(1) (2) (3c) <br />TOTAL HEAD )_ feet <br />C. Pump selection <br />1. A pump must be selected to deliver at least `5 gpm (Step A) <br />with at least _I -_� feet of total head (Step B). <br />END PERFORATION OF A PERFORATED LATERAL <br />acr- <br />s.ti tor.f , 1�w w t:..wawe aaK <br />.1111 M M Iw .r aMw few. W <br />f now up <br />Y LOW W b Ed" <br />.1 1Yra t.y� <br />rr.. s.w tor. 0.11.1..1 LA .M <br />= .rd„ sem'' s.r.r."" <br />t. <br />TABLF OF PERFORATION DISCHARCM IN GPM <br />Hud Perforation diameter Orches) <br />10 <br />f/A <br />1/a <br />I.0a <br />056 <br />0.74 <br />15 <br />0.69 <br />0.90 <br />2.Ob <br />0.80 <br />1.31 <br />25 <br />0.89 <br />1.17 <br />3.0 <br />0.98 <br />Ila <br />4.0 <br />1.13 <br />1.47 <br />SA <br />1.26 <br />1.65 <br />allse 1.0 foot of head for residential systems. <br />bUse 2.0 feet of head for other esublisha+ents <br />Pipe Length <br />Point of Discharge <br />Elevation Difference1te Pump <br />F -18b <br />1.5 inch 2.0 inch 3.0 inch <br />gpm Ffiaim lau per 100 n a(pipe <br />10 <br />0.69 <br />0.20 <br />12 <br />0.96 <br />0.28 <br />14 <br />1.28 <br />0.38 <br />16 <br />1.63 <br />0.48 <br />18 <br />2.03 <br />0.60 <br />20 <br />2.47 <br />0.73 <br />0.11 <br />25 <br />3.73 <br />1.11 <br />0.16 <br />30 <br />5.23 <br />1.55 <br />0.23 <br />35 <br />7.90 <br />2.06 <br />0.30 <br />40 <br />11.07 <br />2.64 <br />0.39 <br />45 <br />14.73 <br />3.28 <br />0.48 <br />50 <br />3.99 <br />0.58 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />