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�, . • � � • <br /> � . <br /> � . •y y C N <br /> , 9 <br /> PUMP SELECTION PROCEDLIRE I <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minunum suggested is 20 gpm <br /> 2. I�.1dXimum SuggeSted i5 45 gPrr��� Perforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution (feet) (inches <br /> 3. a. Select number of perforated laterals 7/3z 1/4 <br /> b. Select perforation spacing= feet. 1.oa o..�6 o.7a <br /> c. Subtract 2 ft. from the rock layer length. t.5 0.69 0.90 <br /> Rock Iryer IengN <br /> -2 ft. = feet. �.- 2.ob 0.80 1.04 <br /> d. Determine the number of spaces between perforations. a Use t.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;qf laterals to <br /> get total number of perforations. A�a�s x �,T�= p rforations. <br /> g• � X �m,��- gPm• . <br /> i <br /> "= SELECTED PUMP CAPACITY��pm <br /> , � <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharg . <br /> '�'�d feet <br /> 2. If pumping to a pressure distribution system,five feet for ressure SoJ Ceatment systvn <br /> required at manifold if gravity system,zero. °:°�"`-"°: �/ O <br /> �_feet Total p�pe I�q�t, <br /> 3. Fricrion loss <br /> -� a. Enter friction loss table with gpm and pipe diameter. i,,,e � gJevanon Dlffernnce <br /> Read friction loss in feet per 100 feet from table(F-14). P'�` <br /> � ------ -- - <br /> F.L. _ �� � ft./100 ft of pipe -�f � <br /> b. Determine total pipe length from pump to discharge --'�°""--�---�� �-- �- �� �� <br /> point. Estimate by adding 25 percent to pipe length fo fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pipe length- 1.25 times pi�e length= I <br /> l�o x 1.25=��feet Friction Loss in Plastic Pipe <br /> c. C a lcu la te to t a l f r i c ti o n l o s s b y m u l ti p l y i n g <br /> friction loss in ft/100 ft by equivalent pipe length.l �,. Nominal <br /> pipe dia. <br /> Total friction loss= 3��_x l t� 3 =100= � � feet <br /> 4. Total head required is the sum of elevation differenc�, ���te 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> �� + '� � ` 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 6.96 2.06 0.30 <br /> TOTAL HEAD � 40 8.91 2.64 0.39 <br /> Z feet 11.07 0.48 <br /> 50 13.46 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection bo 5.60 o.s2 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> ��z 1. A pump must be selected�to deliver at le st <br /> gpm (Step A) with at least �zfeet of total ead (Step B). <br /> ; <br /> ; <br /> � <br /> ; <br />