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< < <br /> PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforaaon Discharges in GFM <br /> Pressure Distibution Head Perforation diameter � <br /> feet inches <br /> 3.a. Select number of perforated lateraLs � �/32 �/4 <br /> b. Select perforation spacing= 3,O feet �.oa � 0.�4 <br /> c. Subtract 2 ft.from the rock layer length. ls o. 0.90 <br /> `� -2 ft._�_fee� . 2ob o.so i.o� <br /> ,��r«� <br /> d. Determine the number of spaces between perforations. a Use 1.o fooc single homes. <br /> Length perf.spacing=�.�ft.+�._ft._�.spaces b Use 20 feet for anythis►g else. <br /> e. �3,spaces+1 =�_perforations/lateral <br /> f. Multiply perforations per lateral by number of lateraLs to ��3� ►b�g. <br /> get total number of perforations. � x p��=��perforations. <br /> g. � x •�_�.BPm. <br /> SELECTED PUMP CAPACTTY�_gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of dischazge. <br /> �'L feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure �°'''�'�""�°°°` <br /> required at mazufold if gravity system,zero. °"` "°' <br /> ��feet T��;��„�, i vo� <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ,,,,� F,n,,,;,,,�� <br /> Read friction loss in feet per 100 feet from table(F-14). �'�` <br /> ..._... .. . <br /> F.L.= a•�o h/100 R of pipe <br /> ......_....._. . . <br /> b. Determine total pipe length from pump to dischazge .....................................q�� <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 /> �sv x 1.25= i �� feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in h/100 ft by equivalent ipe length. Nominal <br /> Total friction loss= �•l' x��+100=_�feet pipe dia. <br /> 4. Total head required is the sum of elevation difference, �O�� 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 5.23 1.55 0.23 <br /> 35 6.96 206 0.30 <br /> TOTAL HEAD �feet '� 8.91 264 0.39 <br /> 45 11.07 3.28 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection 55 4.76 0.70 <br /> 60 5.60 0.82 <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 heati (Step B). <br />