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PUMP SELECT'ION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Petfosation Diachugea ia GFM <br /> Head Perforadon diameter ' <br /> Pressure Distibution 3 feet inches <br /> 3.a. Select number of perforated laterals � 32 � a <br /> b. Select perforation spacing= 3 feet. 1.Oa os6� 0.�4 <br /> c. Subtract 2 h.hom the rock layer length. �S o.b9 0.90 <br /> ��- -2 R._�_fee� . 2ob o.ao i.o4 <br /> wd��ra�+n <br /> d. Deteraune the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing=1`ft.+,�fG=�spaces b Use 20 feet for anything elge. <br /> e. �.spaces+1 ��.1_.Perfosadons/lateral <br /> f. Multiply perfontions per lateral by number of laterals to ���" <br /> get total number of perforations. � x �__lr�perforations. <br /> g. � x •�_.�,�gpm. <br /> SELECTED PUMP CAPACTTY , 3.� 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 �°"m'""''"°"' <br /> required at manifold if gravity�stem,zero. �°' <br /> S feet <br /> r«al pipe�a,�tn `?� <br /> 3. Frichon loss <br /> a. Enter friction loss table with gpal and pipe diameter. �,.,,,,,,,�„a,n <br /> Read friction loss in feet per 100 feet from table(F-14). �'�` <br /> F.L.= a•n c� ft./100 R of pipe ........_ ���. <br /> ... <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-1.25 times pi e length= <br /> ,�_x 1.25=�..�feet �- <br /> c. Calculate total friction loss by multiplying Friction Loss in Plastit Pipe <br /> friction loss in h/100 ft by equivalent pipe length. Nominal <br /> a.o � x 5�X +100=�_feet pipe dia. <br /> Total friction loss= Flow Rate <br /> 4. Total head required is the sum of elevation difference, �� 1S" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> L + `' +�_ 2S 3.73 1.11 0.16 <br /> ' (1) (2) (3c) 30 5.23 1S5 0.23 <br /> 35 6.96 206 0.30 <br /> TOTAL HEAD "� feet `� 8.91 264 0.39 <br /> 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 � 4.76 0.70 <br /> C. Pump selection bo s.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 /> 3s/ gpm (Step A)with at least �_feet of total heasi (Step B). <br /> , <br /> , y:; <br /> l <br /> r� � ,. <br /> � <br />