Laserfiche WebLink
l a o o 5.,,1 ), (<;„,.) <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 in GPM <br /> • <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= 3.3 feet. 1.0a 0.56' 0.74 <br /> c. Subtract 2 ft.from the rock layer length. 1.5 0.69 0.90 <br /> o -2 ft.= K feet. 20b 0.80 1.04 <br /> Rode layer length <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length pelf.spacing=2S__ft.+ILL ft.=21.-spaces b Use 2.0 feet for anything else. <br /> e. 3 spaces+1=_-perforations/lateral <br /> f. Multiply perforationsper lateral bynumber of laterals to 1 t, <br /> PY1y - )R . ,e\s-c “t.> y)--/ oL\ 0 .. <br /> get total number of perforations.main x �_ perforations. 1,i •,,o ..lam v, . .1 t,a`,,• <br /> g. c:7017r x ii, =..23.gPm. <br /> SELECTED PUMP CAPACITY , ') 3 gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> a to feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure soil aeamxnt system <br /> required at manifold if gravity system,zero. ' <br /> eiliw 7,, <br /> \S feet 'fetal pipe length <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Elevationcureence <br /> Read friction loss in feet per 100 feet from table(F-14). l4Pe r w <br /> of r , <br /> .. <br /> F.L.- i ft./100 ft pipe <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 -D x 1.25= 3 i 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. i dial <br /> Total friction loss= �'- U x 3 )Z-- +100= .a-S-- feet P <br /> 4. Total head required is the sum of elevation difference, HO m te 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> Z to + S� + ;,)- 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 /> 40 8.91 2.64 0.39 <br /> TOTAL HEAD (� feet 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 /> 11. A pump must be selected to deliver at least • <br /> 2 gpm (Step A)with at least 5 (o feet of total hemi (Step B). <br />