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9 <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minunum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPM <br /> Pressure Distibution Head Perforation diameter <br /> (feet) (inches <br /> 3. a. Select number of perforated laterals 7/32 i/� <br /> b. Select perforation spacing= feet. i.0a 0.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. �.5 0.69 0.90 <br /> Rodclayerlength <br /> -2 ft. = feet. 2.Ob 0.80 1.04 <br /> d. Determine the number of spaces between perforations. a Use i.o fooc singte homes. <br /> Length perf. spacing= ft.= ft. - spaces b Use 2.o Eeet for anything else. <br /> e. spaces+1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. ��r x ���= perforations. <br /> $• P�r X �m,�a- SPm. <br /> ► <br /> SELECTED PUMP CAPACITY � 3 Zgpm <br /> B.Determine head requirements: <br /> 1. E�evation difference between p and point of discharge. <br /> �� feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure S°��a°n�,�SYS��^ <br /> required at manifold if gravity system,zero. Q:°='°='a� <br /> � feet Total pipe la�gth <br /> 3. Friction loss <br /> a. Enter fricrion loss table with gpm and pipe diameter. r„le Elevaaon Difference <br /> Read Eriction loss in feet per 100 feet from table(F-14). P'� - <br /> F.L. _ ��5 ft./100 ft of pipe <br /> •. ------- -- - <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 fitting loss chart(F-15 feet). <br /> Equivalent pipe len th- 1.25 times ipe length= <br /> 'Zs� x 1.25 = Ib� 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. <br /> Nominal <br /> Total friction loss= ��� x � �-� =100= � feet pipe dia. <br /> Flow Rate <br /> 4. Total head required is the sum of elevation difference, �m 1.5" 2" 3" <br /> special head requirements, and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> �7 + � + -.5� 25 3.73 1 0.16 <br /> (1) (2) (3c) 30 523 .55 � 0.23 <br /> 35 6.96 2.06 0.30 <br /> -7 40 8.91 2.64 0.39 <br /> TOTAL HEAD N feet 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection bo s.bo 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 /> ���Lgpm (Step A) with at least � feet of total head (Step B). <br />