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PUMP SELECTION PROCEDURE <br /> ' A. Deteraune pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perfontion Dischuges in GPM <br /> Head Perfontion diameter <br /> Pressure Distibution feet inches <br /> 3. a. Select number of perforated lateraLs � �/32 i/4 <br /> b. Select perforation spacing= � feet. i.oa o.56 o.�a <br /> c Subtract 2 ft. from the rock.layer length. i.s 0.69 0.90 <br /> S° -2 ft.=_��s feet. 2ob o.so i.oa <br /> x«��yK i�a, <br /> d. Deternune the nuinber of spaces between perforations. a Use 1.0 fooc single homes. <br /> Length perf.spacing=�` �ft.+.�ft.=J�_spaces b Use 2.0 feet for anything else. <br /> e. 1�.,spaces+1 =�perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforahons. � x ��, �� = S 1_perforations. <br /> g' � x �m ` _�SPm. <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 �°''`�'m"""�"�` <br /> required at manifold if gravity system,zero. °"`�°`��°' <br /> Taal i Im �v� <br /> _�feet P� �" <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,,� . ��„�„�� <br /> Read friction loss in feet per 100 feet hom table(F-14). P'�` <br /> ------- -- - <br /> F.L.= a.S ft./100 ft of pipe <br /> ................. . . � � <br /> b. Determute total pipe length from pump to discharge ------------------------------------- � , <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 /> �a 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 pipe length. Nominal <br /> � � pipe dia. <br /> Total friction loss= �•� x �� +100= a� feet <br /> 4. Total head required is the sum of elevation difference, Flow�te 1.5" 2" 3" <br /> special head requirements,and total friction loss. � <br /> 20 2.47 0.73 0.11 <br /> I 3 +�+ � 25 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 �l� feet 40 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 4.76 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 /> 3� gpm (Step A) with at least ��feet of total hea�i (Step B). <br />