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l T <br /> PUMP SELECTTON PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. MaximuIIl Suggeested iS 45 gpm Pe:foation Dischuges in GPM <br /> Head Perforarion diameter � <br /> Pressure Distibution f� ��� <br /> 3. a. Select number of perforated laterals 3 � 32 1/4 <br /> b. Select perforation spacing= 3 � fee� �.oa os6� 0.�4 <br /> c. Subtract 2 ft.from the rocic layer length. �s o.69 0.90 <br /> -2�.= t,o feet z.ob o.so 1.04 <br /> ���� . <br /> d. Determine the number of spaces between perforations. a Use 1.O.foot single homes. <br /> Length pesf.spacing= � ft.+�_�t._�spaces b Use 2o ket Eor anything e1se. <br /> e. � spaces+1= zl perfontions/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. � x � tA =�perforations. <br /> g. S� x�_�gpm. <br /> SELECTED PUMP CAPACTTY�gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of dischazge. <br /> �_feet ' <br /> 2. If pumping to a pressure distribution system,five feet for pressure ��*��^�fn�+ <br /> required at manifold if gravity�stem,zero. Q�b'°�a� �Y�•� <br /> S feet ����s� <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,k �m���n <br /> Read fric�on loss in feet per 100 feet from table(F-14). �'�` <br /> -----•- -- - <br /> F.L.= 3• (o ft/100 ft of pipe . .M_ . � �-L , <br /> b. DetP*�*++�*+e total pipe length from pump to discharge <br /> � ------------------------------------ - <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-1.25 times pipe length= <br /> J t�0 x�.25= a o o feet Friction Loss in Plastic Pi e <br /> c. Calculate total friction loss by multiplying Nominal P <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= 3•to x �4 c� +100=.�feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, �OW�� 1.5" 2" 3" <br /> special head requirements,and total friction loss. �� <br /> 20 2.47 0.73 0.11 <br /> �+ S +�_ 25 3.73 1.11 0.16 <br /> ' (1) (2) (3c) 30 5.23 1S5 0.23 <br /> 35 6.96 206 0.30 <br /> 40 8.91 264 0.39 <br /> TOTAL HEAD �_feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 60 5.60 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 /> y� gpm (Step A) with at least �_feet of total hea�l(Step B). <br />