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: _. .. .�... <br />''LA r �_." 'r . . , , . . . . .. . . .. . .�Q <br /> ia <br /> . �$::.�n�. n',- i• � . . <br /> � <br /> a * <br /> s 1.. <br /> .�1°:�� <br /> PUMP SELECTION PROCEDURE ;���Y�'� <br /> R . 4y�. <br /> �'��,I�..:;,�.t�q <br /> A. Determine pump capacity: `,�,���,�� <br /> Gravity Distribution <br /> 1. Minunum suggested is 20 gpm <br /> S:�; <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPM `� �> <br /> �,� <br /> PieSSuie DlstlbutlOn Head Perforation diameter � <br /> feet inches k <br /> 3. a. Select number of perforated laterals 7/32 1/4 <br /> b. Select perforation spacing= feet. l.oa o.56 0.74 <br /> c. Subtract 2 ft. from the rock layer length. �.5 0.69 0.90 <br /> Rock layer length <br /> -2 ft. = feet. 2.06 0.80 1.04 <br /> d. Determine the number of spaces between perforations. a Use�.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. Mulriply perforations per lateral by number of laterals to <br /> get total number of perforations. ��5 x ��z��= perforations. <br /> g• P� X�,m,���- SPm. <br /> SELECTED PUMP CAPACITY„��gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> �_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure S°''r�a�"�'�SYS'e'" <br /> required at manifold if gravity system,zero. °;°�'°�•°� <br /> �feet 7ota1 p�pe length <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. �„�e . ��.,tio„uxere„�e <br /> Read friction loss in feet per 100 feet from table(F-14). P'� <br /> ------- -- - <br /> F.L. _ ,O 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-125 times pipe length= <br /> �3�x 125= �fo Z feet <br /> c. Calculate total friction loss by multiplying Friction Loss in Plastic Pipe <br /> friction loss in ft/100 ft by equivalent ipe length. Nominal <br /> � pipe dia. <br /> Total friction loss=�• 4�p x �(v =100= feet <br /> F1ow 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 /> �+ � + � 25 3.73 111 0.16 <br /> (1) (2) (3c) 523 0.23 <br /> 35 6.96 2.06 0.30 <br /> TOTAL HEAD /^>C^ feet 0 8.91 . 0.39 <br /> 45 11.07 328 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection bo 5.60 o.s� <br /> 65 6.48 0.95 <br /> 70 7.44 1.�9 <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 />