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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 /> Piessure Distibutlon Head Perforation diameter <br /> feet inches <br /> 3.a. Select number of perforated laterals �/32 1/4 <br /> b. Select perforation spacing= feet. i.oa o.56 0.74 <br /> c. Subtract 2 ft.from the rock layer length. 1.5 0.69 0.90 <br /> Rock layer Imgth <br /> -2 ft. = feet. 2.ob o.so i.o4 <br /> d. Determine the number of spaces between perforations. a Use 1.o foot single homes. <br /> Length perf.spacing= ft.= ft.= spaces b Use 2.0 feet 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 ��5,�e�T = perforations. <br /> S• � x�m �� = SPm. <br /> SELECT'ED PUMP CAPACITY �� gpm <br /> B.Determine head requirements: <br /> 1. E�evation difference between pump and point of discharge. <br /> _�feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure Soil t�eaanent system <br /> required at manifold if gravity system,zero. °'°="='°� <br /> �feet T°�'P'�i�,gm <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,,e . ��„�„�,e„�e <br /> Read hiction oss in feet per 100 feet from table(F-14). P`� <br /> ------- -- - <br /> F.L._ •� 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 fitting loss chazt(F-15 feet). <br /> Equivalent pipe length-1.25 times p}pe length= <br /> ��x 1.25= �/L feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> Nominal <br /> friction loss in ft/100 ft b equivale t pipe length. pipe dia. <br /> Total friction loss= Z.l.� x � Z =100= � feet �ow Rate <br /> 4. T o t a l h e a d r e q u i r e d i s t h e s u m o f e l ev a t i o n d i ff erence, �m 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 8 20 2.47 0.73 0.11 <br /> + � +� 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 523 1.55 0.23 <br /> 35 6.% 2.06 0.30 <br /> 40 8.91 2.¢4 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 bo s.bo o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected t deliver at least <br /> 3� gpm (Step A) with at least �eet of total head (Step B). <br />