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' pi1MP S�LECTION PROCEDLJRE _ <br /> A. Determine pump capacity: <br /> Gravity Distribution - <br /> 1, Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perfontion Diachuges in GPM <br /> Head Perfondon diameter ' <br /> Pressure Distibution feet inches <br /> 3. a. Select number of perforated laterals 3 7 32 �/4 <br /> b. Select perforation spacing= 3 feet. 1.oa os6' _ 0.74 <br /> c. Subtract 2 ft.from the rock.layer length. �.5 0.69 0.90 <br /> `� -2 ft._�_feet. . 2ob o.so i.o� <br /> x«��y�r���n <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing=�ft.+ -' ft. = 13 spaces b Use 20 feet for anything else. <br /> e. I 3 spaces+1 =�_perforations/lateral <br /> f. Multiply perforations per lateral by number of lateraLs to i J y�9,�. <br /> get total number of perforations. ��. x �r�, � _�3 perforations. <br /> g. .� x�=�..L SPm. <br /> SELECTED PUMP CAPACITY 3 I 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 50°°°'�"'�"`�' <br /> required at manifold if gravity system,zero. °"` `�°' <br /> _�_feet T«�Pi��m�" 9[` <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. � ��„�„�� <br /> Read Eriction loss in feet per 100 feet from table(F-14). �'�` <br /> ..--••- -• - <br /> F.L._ /. � ft./100 ft of pipe <br /> , ................. . ,-----------------------.._.......... �� <br /> b. Determule total pipe length hom pump to discharge <br /> point. Estimate by adding 25 percent to pipe length Eor fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length- 1.25 times pipe length= <br /> ay� x 1.25= 3 d!o feet Friction Loss in Plastic Pipe <br /> c Calculate total friction loss by multiplying <br /> friction loss in R/100 ft by equivalent pipe length. Nominal <br /> Total friction loss= �� pipe dia. <br /> �o _x 30 4� +100=��feet �ow Rate <br /> 4. Total head required is the swn of elevation difference, �� 1.5" 2" 3" <br /> special head requirements, and total hiction loss. <br /> 20 2.47 0.73 0.11 <br /> �_+ S' + S 25 3.73 1.11 0.16 <br /> ' (1) (2) (3c) 30 5.?3 1.55 0.23 <br /> 35 6.96 206 0.30 <br /> TOTAL HEAD a�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 0.70 <br /> 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be seiected to deliver at least <br /> ?�_gpm (Step A) with at least _� feet of total hea�i (Step B). <br /> ,:_ <br /> ,,� <br /> � .,;; : <br /> �{� ... .. .. .. , . . _ . . .. <br />