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i r.,l' a M• • : • i• 1C <br />A. Determine pump capacity <br />Gravity Distribution <br />I. Minimum suggested is 600 gallons per hour 00 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 D-utibution <br />3. a. Select number of perforated laterals <br />b. Select perforation spacing = feet. <br />C. Subtract 2 ft from the rock laver length. <br />I I -� - 2 ft = feet <br />d. Determine the number of spaces between perforations. <br />Length perf. spacing = ft. + ft. = = spaces <br />e. spaces + I = ' perforations/lateral <br />f. Multiply perforations per lateral by -,number of laterals to a' <br />get totalnumber of perforations. x _ perforations. <br />g. 7m x ary W . <br />-11- 9POL <br />SELECTED PUW CAPACITY -" gpm <br />B. Determine head requirements: <br />1. Elevation difference between pump and point of discharge. <br />i feet <br />2. If pumping to a pressure distribution system, five feet for pressure <br />v 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 />F.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 />Yx1.25= i,r� feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 h by equivalent pipe length. <br />Total friction loss = - x f +100 = Z feet <br />4. Total head required is the sum of elevation difference, <br />special head requirements, and total friction loss. <br />=i + + =, <br />(1) (2) (3c) <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 ; !- feet of total head (Step B). <br />F-17 <br />DO KWORAT,OM OF a ► WORLT('J LAT(AL- <br />fig Cw <br />irT.,.r <br />Z . C__ /r, ■ fir, • <br />• . 1.�� f.. lM ' 11r If;� M MU � �t•..My <br />« iWa sA. <br />[r. S.y Low Mir. M u.w <br />waivrrr"M4 50d L4nw <br />sa mm PW a�uw' u * mi <br />Hi�dr <br />Vm) <br />_+ rr <br />1" .. fr <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 LcngLh <br />Point of Dischm,le <br />TT �G- <br />©eva6an Diffemw J c <br />P <br />F-18b <br />1.3 inch 2.0 inch 3.0 inch <br />MM rtCumImr.imndV4. <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 />0.43 <br />18 <br />2.03 <br />0.60 <br />20 <br />147 <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 />0.49 <br />50 <br />3.99 <br />0.58 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.92 <br />