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�UMP SELECTION PROCEDURE <br /> A. Deteraune pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested 15 45 gpm Per�oration Dischuges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution feet ;I,c�,es <br /> 3. a. Select number of perforated lateraLs �/32 i/4 <br /> b. Select perforation spacing= feet. �.oa o.56 0.�4 <br /> c Subtract 2 ft.from the rocic.layer length. 1S o.69 0.90 <br /> �x�y�i�, <br /> -2 ft.= feet , 20b o.so i.o4 <br /> d. Determu�►e the number of spaces between perforations. a use�.o foot single homes. <br /> Length perf.spacing= ft.+ ft= spaces b Use 20 feet for anyching eLse. <br /> e. spaces+1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. � x �= perforations. <br /> g' � X av�- SPm. <br /> usE 7/3a Pr F� <br /> SELECTED PUMP CAPACTTY 3 b 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 5°''�'@'�'�s,�°' <br /> required at manifold if gravity s stem,zero. Q"�'b"�' <br /> � feet T��a►�s�+ <br /> 3. Friction loss <br /> a. Enter hiction loss table with gpm and pipe diameter. ��,,,;a,� <br /> Read friction loss in feet per 100 feet from table(F-14). �'�` <br /> F.L.= a.�ft./100 ft of pipe ��...� <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 fitting loss chart(F-15 feet). <br /> Equivalent pipe length-1.25 times pipe length= <br /> 3 v x 125= �sr feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying Nominal <br /> friction loss in R/100 ft by equivalent pipe length. <br /> Total friction loss= �3 _x � �y +100=_�_feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, �O�"'�� 1.5" 2" 3" <br /> gpm <br /> special head requirements,and total friction loss. <br /> -� + s + � 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.% 6 0.30 <br /> 40 8.91 <� 0.39 <br /> TOTAL HEAD �feet 45 11.07 28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 60 5.60 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 head (Step B). <br />