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L � <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm PerfonHon Disc�urga in GPM <br /> Head Perforation diameter ' <br /> Pressure Distibution feet ;nches <br /> 3. a. Select number of perforated lateraLs 3 �/32 �/4 <br /> b. Select perforation spacing= -3 feet. �.oa os6� .7 <br /> c. Subtract 2 ft.from the rock.layer length. 1s o.69 . <br /> ��° -2 h.= 4 � feet. 2ob o.so i.oa <br /> �� . <br /> d. Determule the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing= �!� ft.+�ft._�spaces b Use 20 feet for anything eLse. <br /> e. 1�,spaces+1 =�Z perforations/lateral <br /> f. Multiply perforations per lateral b number of lateraLs to �/y�o��q <br /> get total number of perforations. �; x � d = s�/ perforations. <br /> g' � X sa�-��m. <br /> SELECTED PUMP CAPACTTY�gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of dischazge. <br /> 9 feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure 5oi'°"�""�°�' <br /> required at manifold if gravity s stem,zero. °'-`���� <br /> �� feet T����� <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 /> F.L.= 2.y ft./100 R of pipe �� <br /> ._.._.... . . <br /> b. Deteraune 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 /> 13 o x 1.25= l c.z 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 frichon loss= Z� x i I.-L +100=�_feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, �OWm te 1.5" 2" 3" <br /> special head requirements,and total friction loss. � <br /> 20 2.47 0.73 0.11 <br /> � + �b' +�_ 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 `� 8.91 264 0.39 <br /> 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Puinp selecEion 55 4.76 0.70 <br /> bo s.w 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 �� feet of total heasi (Step B). <br />