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� � � <br /> PUMP SELECTTON PROCEDURE <br /> A. Determine pump capacity: <br /> Gnvity Diatribution <br /> 1. Miaimum suggested is 20 gpm <br /> 2. M3ximum Suggested is 45 gpm Perforatlon Diacharges in GPM <br /> Head Perforadon diameter ' <br /> Pressure Distibution Eeet inches <br /> 3.a. Select nuanber of perforated laterals 3 7 3z 1/4 <br /> b. Select perforation spacing=�_feet. i.oa o.sb' 0.�4 <br /> c. Subtract 2 ft.from the rocic layer length. �.5 0.69 0.90 <br /> -2 ft._�..�fee� 2ob o.so i.o� <br /> ,��,�,�n � <br /> d. Deteraune the number of spaces between perforahons. a Use�A foot si:►gle homes. <br /> Length perf.spacin _`-��ft.+�,_ft=��spaces b Use 20 het for anything else. <br /> e. �spaces+1 =�perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to !)�`o�,A. <br /> get total number of perforations. y� x � , ,_ � _perfomtions. <br /> g. ,� x�-�gpm. <br /> SELECTED PUMP CAPACTTY�_gpm <br /> B.Determine head requirements: <br /> 1. Flevation difference between pump and point of dischazge. ' <br /> _ �feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> sa►ti..�.y.o� <br /> required at manifold if gravity s stem,zero. <br /> Ton�qP��h `�y,lo <br /> feet �" <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diazneter. �,,,,,,,,�� <br /> Read friction loss in feet per 100 feet from table(F-14). a�` <br /> - a•S h./100Rofpipe ....--- .. . � <br /> F.L.- ....._....... <br /> b. Deterrmine total pipe length from pump to discharge � .....................................�a � <br /> point Estimate by adding ZS 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 /> �x 1.25=�_feet Friction Loss in P1astiC Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/1�00 ft b�y equivalent pipe length. Nominal <br /> Total friction loss= �•S x�+100=�_feet Pl��� <br /> 4. Total head required is the sum of elevation difference, �O�"�� 1.5" 2" 3" <br /> special head requirements,and total friction loss. � <br /> 20 2.47 0.73 0.11 <br /> �+ S� +�_ 2S 3.73 1.11 0.16 <br /> ' (1) (2) (3c) 30 5.23 1.55 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 /> C. Pump selection 55 4.�6 0.�0 <br /> 60 5.60 0.82 <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 heasi (Step B). <br />