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� ` • 9 <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perfotation Discharges in GPM <br /> Pressure Distibution Head Perforation diameter <br /> feet inches <br /> 3.a. Select number of perforated laterals 7/32 �/4 <br /> b. Select perforation spacing= feet. 1.0a o.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. i.5 0.69 0.90 <br /> 2.06 0.80 1.04 <br /> R«�irYe���g�n"2 ft. = feet. <br /> d. Determine the number of spaces between perforations. a Use�.o foot single homes. <br /> Length perf.spacing= ft.= ft. = spaces b Use 2.0 feet for anything else. <br /> e. spaces+ 1 = perforations/lateral <br /> f. Mulriply perforations per lateral by number of laterals to <br /> get total number of perforations. �e a s x �r 5���= perforations. <br /> $• T x�,m��a= gPm. <br /> SELECTED PUMP CAPACIT'Y 3S 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 s���ad"�,�SYs�e"' <br /> required at manifold if gravity system,zero. °�°="'°� <br /> �.r.., feet row P��ie,Rm <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. t„�e .� ElevationDifference <br /> Read friction ss in feet per 100 feet from table(F-14). P`� <br /> ------- -- - <br /> F.L. _ � ft./100 ft of pipe <br /> _....- ...... . <br /> b. Determine total pipe length from pump to discharge ----------------"--------------'-�--' <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss, or use a fitting loss chazt(F-15 feet). <br /> Equivalent pipe length- 1.25 times p p length= <br /> .36- x 1.25=�.�feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying - � <br /> friction loss in ft/100 ft y equiva e t pipe length /! Nominal <br /> Total friction loss-z��x�:100-�Z feet pipe dia. <br /> Flow Rate <br /> 4. Total head required is the sum of elevation difference, �m 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> �,,� � � � 20 2.47 0.73 0.11 <br /> �_+ +1•Z•S 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 523 1.55 023 <br /> � 3� 6.96 2.06 0.30 <br /> TOTAL HEAD �feet �� 8•91 0.39 <br /> 45 11.07 . 8 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection bo 5.60 o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be sele te o deliver at least <br /> �gpm (Step A) with at least�,�"7_ feet of total head (Step B). <br />