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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 = -Z feet. <br />C. Subtract 2 ft. from the rock layer length. <br />�- 2 ft.= - feet <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing = r'. ft. + _� ft. _ Z spaces <br />e. ''J? spaces + I = o -7 perforations/lateral <br />f. Multiply perforations per lateral by number of laterals to 1) <br />g. Ztotal number of perforations.... x , perforations. <br />x �� gpm.. =pm. <br />SELECTED PUMP CAPACITY 71�p- gpm <br />B. Determine head requirements: <br />1. Elevation difference between pump and point of discharge. <br />�'� feet <br />2. If pumping to a pressure distribution system, five feet for pressure <br />required at manifold if gravity system, zero. <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 />RL - -, -'- 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 />: r x 1.25 = -t feet <br />c. Cakulate total friction loss by multiplying <br />friction loss in ft/ 100 h by equivalent pipe length. <br />Total friction loss a • 'u x ? - L- +100 - q feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />+ C +C7 <br />(1) (2) (30 <br />TOTAL HEAD `/ feet <br />G Pump selection <br />1. A pump must be selected to deliver at least <br />.ec7_ gpm (Step A) with at least ? v feet of total head (Step B). <br />F-17 <br />0o POWD TWN Or • rveroPI.Trp LATrra,L <br />r- <br />.. � Lffift 1`00 L/M • ' Y� IAS �1 � � w wY <br />two tr.. w <br />M rL.W <br />/Vorwr LMEM1r o1 <br />Yrphone I -d 1. M�1 <br />ttaquUW Perfaaaon Diqehaeta <br />ui plknu pw aws to (apmJ' <br />Had <br />0.20 <br />no rr <br />((feet <br />0.% <br />0.21 <br />1.0a <br />0.56 <br />0.74 <br />2.Ob 1 <br />0.80 <br />1.04 <br />a. Use for single family homes <br />b. Use for all other applications <br />Pipe L=gth <br />AZY <br />1]evadm Dit[ererdw <br />P /ao 0 <br />F -11b <br />1.5inch 2.0 inch 3.0 inch <br />fpm tiHwr.r.Iaont„. <br />10 <br />0.69 <br />0.20 <br />12 <br />0.% <br />0.21 <br />14 <br />1.21 <br />0.38 <br />16 <br />1.63 <br />0.48 <br />11 <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 />3.21 <br />0.41 <br />50 <br />3.99 <br />0.52 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />