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Designed By:Septic Evaluations Inc. August 28, 1998 <br /> Chanhassen,'MN ' Ann Carpentier <br /> (612)4704024' PUMP SELECTION PROCEDURE 301 Willow Drive <br /> Lic. #890 Orono, Hennepin Co. <br /> A. Determine pump capacity. <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2 Maximum suggested is 45 gpm ftfaration Diuhacges in GPM <br /> Pressure Distibution � Pedo a ion diam <br /> 3.a. Select number of perforated laterals 3 a <br /> b. Select perforation spacing= 3 feet. 1.Oa 0.56 ala <br /> C. Subtract 2 ft.from the rock layer length. 1� � 00.0 <br /> y , 7 i14-2 ft.= feet. <br /> d. Determine the number of spaces between perforations. a use 1.0 foot single homes. <br /> Length pert.spacmi g= 35 &. 3 g,a 11.8 spaces b use 20 Meet for anything else. <br /> e. 11.8 spaces+1= 13.0 perforationagateral <br /> f. Multiply perforations per lateral by n QQf laterals to Header Pipe Connected in the: <br /> 3 3.0 _ Middle <br /> Sett tot On?6{mber of perforations. ... x IMMM- 39.0 pe options. <br /> g• 1 O x 1 . =21.88Pm• Min. diameter for perferated <br /> SELECTED PUMP CAPACITY 21.8 Spin Laterals is: 1 1/4 <br /> B.Determine head requirements: <br /> 1. Elevation difference betweenpump and point of discharge. <br /> 15 feet <br /> z If pumping to a pressure distribution system,five feet for pressure sin. <br /> required at manifold if gravity stem zero. <br /> 00 feet VaWrrrkx%ft <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. t <br /> Read friction loss in feet per 100 feet from table(F-14). 1:2 <br /> F.L.= 1.11 ft./100ftof pipeb. Determine total pipe length from pump to discharge ................................... <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> lass,or use a fitting loss chart(F-15-1§2-feet). <br /> Equivalent pipe length-1.25 times pipe length= <br /> 180 x 1.25= 225 feet Friction Loss in Plastic Pi e <br /> c. Calculate total friction loss by multiplying Nominal <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> pe dia. <br /> Total friction loss= 1.11 x 225 +100= 2.50 feet p' <br /> 4. Total head required is the sum of elevation difference, HOW RateSpm 1S" r 3" <br /> special head requirements,and total frit im loss. <br /> 20 2.47 0.73 0.11 <br /> 15 + 5.0 + 2.50 25 3.73 LU 0.16 <br /> (1) (2) (3c) W 5.23 1.56 023 <br /> 35 6.96 2.06 0,30 <br /> TOTAL HEAD 22.5 feet 4455 19� .?3.28 0 48 <br /> 50 13.46 3.99 0S8 <br /> 70 <br /> G Pump selection 6600 S 60 082 <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> 21.8 gpm (Step A)with at least 22.5 'feet of total bead(Step B). ©1997 Melonie L. Elvebak <br />