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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 Perforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution feet inches <br /> 3.a. Select number of perforated laterals 7/32 i/4 <br /> b. Select perforation spacing= feet. 1.oa o.sb o.7a <br /> c. Subtract 2 ft. from the rock layer length. 1.5 0.69 0.90 <br /> 2.Ob 0.80 1.04 <br /> R�iaye�i�g�n"2 ft. = feet. <br /> 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 /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. r e�a 5 x ��5,�e�r = perforations. <br /> � S• � X�,m �� = gPm. <br /> SELECTED PUMP CAPACITY-'�SPm <br /> B.Deteraune head requirements: <br /> 1. E�evation difference between pump and point of discharge. <br /> _�feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure Soil teatment system <br /> required at manifold if gravity system,zero. °•°="=°� <br /> .Sr feet row y;��g,gm <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,� . ��„�„�R„re <br /> Read friction loss in feet per 100 feet from table(F-14). P`� <br /> ------- -- - <br /> F.L._ • ft./100 ft of pipe ................. . <br /> b. Determine total pipe length from pump to dischazge �-��-----------���-���------�-----��� <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length-125 times pipe length= <br /> ��x 1.25=��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 /> pipe dia. <br /> Total friction loss=3'�x�=100= � feet <br /> 4. Total head required is the sum of elevation difference, �O�'�'m te 1.5" 2" 3" <br /> special head requirements,and total friction loss. � <br /> � 20 2.47 0.73 0.11 <br /> �_+ +�_ 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 � 11.07 0.48 <br /> 13.46 3. 0.58 <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 /> �gpm (Step A) with at least �feet of total head (Step B). <br />