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Iov5�1 ia�" ..� <br /> • • <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 Perforation Discharges sn GPM <br /> Head Perforation diameter <br /> Pressure Distibution (feet) (inches) <br /> 3.a. Select number of perforated laterals 3 7/32 1/4 <br /> b. Select perforation spacing= 3.0 feet. 1.0a 0.56' 0.74 <br /> c. Subtract 2 ft.from the rock layer length. 1.5 0.69 0.90 <br /> "° -2 ft.= feet. 2.0b 0.80 1.04 <br /> Rock layer length <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing=2.s ft.+,,12.ft._ spaces b Use 2.0 feet for anything else. <br /> e. 3 spaces+1=,3 3 perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> 1)y`l-p, A--- <br /> ,,v,s-c %-t\ YVI rJ 6S '--\-S, <br /> :let total number of perforations.nal. x -ArhunT= perforations. i ),i -4 4;Y "Al via ;. <br /> g. x IAN=2�gpm. <br /> SELECTED PUMP CAPACITY . ') 3 gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> u_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure Sod treatment system <br /> required at manifold if gravity system,zero. ?c„. <br /> ------feet It">i�With <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Elevation Memo <br /> o,Me <br /> Read friction loss in feet per 100 feet from table(F-14). PSP' M K .. <br /> i? <br /> i <br /> F.L. _ft./100 ft of pipe r <br /> o <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 length-1.25 times pipe length= • <br /> a s`D x 1.25= 31 feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying Nominal <br /> friction loss in ft/100 ft by equivalent pipe length. pipe dia. <br /> Total friction loss- • 0 x 3 11- +100= • feet How Rate <br /> 4. Total head required is the sum of elevation difference, 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> Z to + s" + Q- 25 3.73 1.11 0.16 <br /> ' (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 6.96 2.06 0.30 <br /> TOTAL HEAD S(c feet `5 8.91 2.64 0.39 <br /> 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 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> • <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> C)3 gpm (Step A)with at least 5`(.., feet of total head(Step B). <br />