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; ' � <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: �,� -� ; y �- � _ � <br /> Gravity Distribution �,� -� : �� a � - ') <br /> 1. Minimum suggested is 20 gpm ��i -� '. t� a � y � <br /> 2. Maximum Suggested is 45 gpm �.'? - � :`1 + 1= C� Perfontlon Discturges in GPM <br /> a � -� ' L� t � `'' Head Perforation diameter ' <br /> Pressure Distibution 1� -� :�`-� -> ) _ � feet ir►ches <br /> 3. a. Select number of perforated lateraLs � �� -a =`� -' � �- 5 7 32 1 4 <br /> b. Select perforation spacing= y. D fee� � �-� �. `� � � "- S �.oa o.56' 0.74 <br /> c Subtract 2 h.from the rock layer length. �'� - a . u ' I � � 1S o.69 0.90 <br /> x�d��yK ia+�a+ <br /> -2 h.= fee� �a Zob o.so i.oa <br /> d. Determine the number of spaces between perforations. ��"{' � a Use lA foot single homes. <br /> Length perf.spacing= ft•+ ft.= spaces b Use 20 feet for anythiag eLse. <br /> e. spaces+1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perfontions. ��. x �_�perforations. <br /> g' '� x w�-�'- "�'SPm. <br /> SELECT'ED PUMP CAPACITY��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 5oi1"�"a"°"'�'"" <br /> required at manifold if gravity system,zero. �'' "��`�� <br /> .�_feet T°r'i��.�'�►' <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,k �„,,,,,,�� <br /> Read friction loss in feet per 100 feet from table(F-14). �'�' <br /> -•..... _. . <br /> F.L.= a- � ft./100 ft of pipe <br /> ._._._._ . " !�.! <br /> b. Determine total pipe length from pump to discharge ...............................•--•-• ' ` <br /> point Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a firiing loss chart(F-15 feet). <br /> Equivalent pipe length-1.25 times pipe length= � <br /> �x�.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 /> Total friction loss= �, 1 x a , l� +100=�_feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, �OW�� iS" 2" 3" <br /> special head requirements,and total friction loss. � <br /> 20 2.47 0.73 0.11 <br /> �,_+ � +�_ 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 /> 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 55 4.76 0.�0 <br /> bo 5.�0 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 .1.�feet of total hea�i (Step B). <br />