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F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A_ Determine pump capacity: Gras tee+ <br /> Gravity Distribution T..e.a <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of01 S • t,e5...d • ,,b k-�.r <br /> .L. tl tom, : d ow'.rtw Feerle`""Ir'°L.v- <br /> water use rate. - .Ne nod ray,..o.. ) O' <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 r-■ lmoms! ^ ^o�^a11To� 17 <br /> r,rr*cee M..r o <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. .:36.,,,,,, Low 12'14 Edge <br /> PWHrarl.ti Lerelod el <br /> Pressure Distibution • CNee s..'d L"*..- a'" "'41-•"'°' <br /> 3.a. Select number of perforated laterals .3 -:,0,0,.. <br /> - -. a ` <br /> - <br /> b. Select perforation spacing=_a_feet. lM°'P Sem!-La;;"'"° <br /> c. Subtract 2 ft.from the rock layer length. <br /> �IareO-2ft = �3 feet. <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= ft.+ Z ft.= spaces Required Perforation Discharge <br /> e. 11 spaces+1= / V perforations/lateral in gallons per minute(gpm) <br /> f. Multiply perforations per lateral by number of laterals to HeaDischarge ;i2ad'P"r ` Inch pal <br /> get total number of perforations. y,d„,. x pciALI= 59 perforations. (feet) <br /> g ` x...12.4- - gpm. 1.0a 0.56 0.74 <br /> SELECT hi)PUMP CAPACITY 40 gpm 2.Ob 0.80 1.04 <br /> B.Determine head requirements: a.Use for single family homes <br /> 1. Elevation difference between pump and point of discharge. b.Use for all other applications <br /> __4(,_feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. <br /> C feet <br /> 3. Friction loss . <br /> a. Enter friction loss table with gpm and pipe diameter. Pipe Length <br /> I I <br /> Read friction loss in feetr 100 feet from table. <br /> Pe Point of Discharge <br /> F.L= J, tey ft./100 ft of pipeT <br /> b. Determine total pipe length from pump to discharge Elevation Difference <br /> point. Add 25 percent to pipe length for fitting pip c13, <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= F-18b <br /> 1 ) 0 x1.25= )a4S feet <br /> c. Calculate total friction loss bymultiplying 1.5 inch 2.0 inch 3.0inch <br /> multi P Yi $ gpn, Friction lots per 1 Do n of pipe <br /> a <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= -104 x /2 c&I +100= y feet 10 0.69 0.28 <br /> 12 0.96 0.28 <br /> 4. Total head required is the sum of elevation difference, 14 1.28 0.38 <br /> special head requirements,and total friction loss. 16 1.63 0.48 <br /> 18 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> I !o + + 4/ 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> TOTAL HEAD 1..( feet 45 14.73 3.28 0.48 <br /> 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.60 0.82 <br /> 1. A pump must be selected to deliver at least <br /> 40 gpm (Step A)with at least D,( feet of total head (Step B). <br />