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A. Determine pump capacity: <br />Gravity Distribution <br />1. Minimum suggested is 600 gallons per hour t :0 gF ) 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 Distibution <br />3. a. Select number of perforated laterals _ <br />b. Select perforation spacing = 3 feet. <br />C. Subtract 2 ft from the rock layer length. <br />•�=' '-2ft.= L ,/ feet. <br />w.cl L.M r!'S <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing = 9 Z ft. + 3 ft. _ spaces <br />e. ! L&_ spaces + 1 = II perforatiunsllateral <br />f. Multiply perforations per lateral by number of lateral.; to <br />-' perforations. <br />Get tot nu r of perforations. x -� ;= � _ <br />,� L , . <br />g• x' '�,.N � � gpm. <br />SELECTED FUIMT CAPACIT. gpm <br />B. Determine head requirements, <br />I. Elevation difference between pump and point of dischargt. <br />I "),_ feet <br />It pumping to a pressure distribution system, five feet tur ; ressure <br />required at manifold if gravi stem, zero. <br />7 feet <br />3. Friction less <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 - .2.q fL/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 />!a n x 1.25 - I I D feet <br />c. Cakulate 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 = ` feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />)L + S' + <br />{1) (2) (30 <br />TOTAL HEAD -' feet <br />C. Pump selection <br />1. A pump must be selected to deliver at least <br />- gpm (Step A) with at least :,� 0 feet of total head (Step B). <br />F-17 <br />END PERFORATMIN OF a KWORITED LATERAL <br />• <br />• L.M, S-r L I <br />LM N LwynM NI E. hV • <br />Y,l q.. N w . _ wM <br />i.' A.. <br />.� ! W <br />P.M.�Mr� L1ufM N <br />S" L.,e <br />1.. M. N l..- <br />R"uard Perforation ln,cr e <br />er Ln Gallons peunute (9M <br />DL66urSe <br />i1cad <br />/72b� <br />i wrM <br />(feet) <br />1.0a <br />0.74 <br />2.0b <br />0.80 <br />1.04 <br />a. Use for single family homes <br />b. Use for all other applications <br />Pipe Length <br />Point o(Dischup <br />Elcvatwn Diffcn= <br />ITAUmp 'tom <br />F-18b <br />1.5 inch 2.0 inch 3.0 inch <br />PM rrmI Ma Va 100 R of p" <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 />164 <br />0.39 <br />45 <br />14.73 <br />3.23 <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 />