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F-17 <br /> PUMP SELECTION PROCEDURE <br /> END PERFORATION OF A PERFORATED LATERAL <br /> A. Determine pump capacity: *a.no C"" <br /> Gravity Distribution Upon <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of .z::.- � <br /> water use rate. ' ~o^no nolopow) <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2700 1,=7 ;-s irr i "r='°r°"""°""""' <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. .,-q,,. , wLaos�Edo <br /> T. :-:: .. . •-....."..an«.i., LocsI..It <br /> Pressure Distibution • 0... ....i°',u.� Bono%M`_'MOI <br /> 3.a. Select number of perforated laterals 3 . - . ..: ::` <br /> b. Select perforation spacing= 3 feet. Solon ,. ;� <br /> c. Syb.ttract 2 ft.from the rock layer length. , <br /> Ore* 2ft.= /647 5-feet. <br /> d. Determine the number of spacce�ss between perforations. <br /> Length perf.spacing=f.7S-ft.+,2_ft.=.,,22_spaces Required Perforation Dksdiarge <br /> e. 2.2 spaces+1= '�3 perforations/lateral ut gallons per minute <br /> f. Multiply perforations per lateralb,x number of laterals to Discharge <br /> s aseH , wa.peel y sea pot <br /> get total n mbe�rr of perforations. x-- _ /o? perforations. (feet) ` <br /> g. old. x =..e11l.gpm. <br /> L;1'h1)PUMP CAPACITY 3 / gpm 1.0ba 0.56 0.74 <br /> SELE <br /> 2.O 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 application: <br /> a 1 feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. <br /> ,� feet <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. ` Pipe Length <br /> Read friction loss in feet per 100 feet from table. Point of D <br /> F.L= 311 ft./100 ft of pipe "... <br /> b. Determine total pipe length from pump to discharge Elevation Difference <br /> point. Add 25 percent to pipe length for fitting pump <br /> loss,or use a fitting loss chart. Equivalent pipe <br /> length-1.25 times pipe length= <br /> /8'0 x 1.25= a a S feet F-18b <br /> c. Calculate total friction loss by multiplying SPm i.SFrictionlosinchs.0perRotpi°inch� <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> Total friction loss= 3.44 x 2 25- +100= 9 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 /> ` + 5" + l' 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 /> TOTAL HEAD `S S 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 /> S!gpm (Step A)with at least 35- feet of total head(Step B). <br />