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�. _ _ _ _ . _ ._ __ . .. _ _ _ _. _.. _ _ _ _ ... __ <br /> .._ . .___ <br /> i <br /> I • � `� " <br /> ' • � � 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 Perforation Discharges in GPM <br /> Head Perforation diameter <br /> I Pressure Distibution feet inches <br />� 3.a. Select number of perforated laterals 7/32 1/4 <br />� b. Select perforation spacing= feet. i.oa o.55 o.�a <br /> i c. Subtract 2 ft.from the rock layer length. 1.5 0.69 0.90 <br /> n«k�ye��d,8�n <br /> -2 ft. = feet. 2.Ob o.so 1.04 <br /> i d. Determine the number of spaces between perforations. a Use 1.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 /> if. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. ��T x ��5���- perforations. <br /> I O. � X gpm �� = gpm. <br />� SELECTED PUMP CAPACITY � a gpm <br /> B.Deternune head requirements: <br />� 1. Elevation difference betwee-r�^' p and point of dischazge. <br /> I feet <br /> 2. If pumping to a pressure distribuhon system,five feet for pressure s�'''R'°"e"�SYS'�" <br /> required at manifold if gravity s��stem,zero. °'°="='°� <br /> _,,�feet Total pipe Imgth <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,k • n�,,,;,,,�,n,« <br /> Read friction lo s 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 /> i point. Estimate by adding 25 percent to pipe length for fitting <br />� loss,or use a fitting loss chazt(F-15 ' feet). <br /> iEquivalent pipe length-125 times pi e length= <br /> I �p x 1z5=�(�feet Friction Loss in Plastic Pipe <br />' c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 ft by equivalent ipe length. Nominal <br />� Total friction loss= -G.3 x ' •2 G� =100= � feet pipe dia. <br /> Flow Rate <br /> 4. Total head re quired 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 /> � � (,�' + --� + Z 25 3.73 1.11 0.16 <br /> � (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> � 40 8.91 2.64 0.39 <br /> TOTAL HEAD � � feet 45 11.07 3.28 0.48 <br /> i 50 13.46 3.99 0.58 <br /> I 55 4.76 0.70 <br /> C. Pump selection bo 5.bo o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> I �� gpm (Step A) with at least �3 feet of total head (Step B). <br /> � <br /> � <br /> I <br /> i <br /> I <br /> � <br /> ( <br /> I <br />