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F-17 <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 Distibution <br />3. a. Select number of perforated laterals <br />b. Select perforation spacing = 3 feet. <br />C. Su ct 2 ft from the rock layer length. <br />- 2 ft. = Co(0 feel <br />d. Detemnne the number of spaces between perforations. <br />Length perf. spacing = L. L, ft. • -,7,- ft. _ ZI.a spaces <br />e. �-I spaces+ 1 = ay perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to 1)JU-0ta. <br />total umber of perforations. -Zyx a3 = �_ perforations. <br />f, � <br />g. x � _ gpm. <br />SELECTED PUMP CAPACITY -?!2_ gpm <br />B. Determine head requirements: <br />1. Elevation difference between pump and point of discharge. <br />s feet <br />2. If pumping to a pressure distribution system, five feet for pressure <br />required at manifold if gravity s stem, zero. <br />S 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. = D. L, 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 />L4 �j- x 1.25 = :�O_ feet <br />c. C.lculate total friction loss by multiplying <br />K-tion loss in ft/100 ft by equivalent pipe length. <br />Total fr'cbon loss = D • 1, x !ro +100 = �_ feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />+ l <br />(1) (2) (3c) <br />TOTAL HEAD // feet <br />C. Pmnp selection <br />1. A pump must be selected to deliver at least <br />30) gpm (Step A) with at least i) feet of total head (Step B). <br />Im PMOUTOO or a KNOelTM _1T[R11 <br />arw <br />Tr. <br />C-4• /M <br />-OhLw Lr ., Up <br />r <br />r Am -.,r <br />[- fw t.w <br />�••••• r U�..v <br />Requuwi Par(mbm DUxhmp <br />In per n+nw1e (Fpmi <br />e <br />Nud12 <br />Ofto <br />M N <br />1.0a <br />0.56 <br />0.74 <br />2.Ob <br />0.80 <br />1.04 <br />a. Use for single family homes <br />b. Use for all other applications <br />Pipe LengLh <br />Point of f <br />DMevauon Diffem-,=p � <br />F-18b <br />1.5 u'.ch 2.0 inch 3.0 inch <br />PM Frwim im M ) 00 ft 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 />2.64 <br />0.3 <br />40 - <br />1 L07-" <br />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 />