Laserfiche WebLink
F-17 <br /> PUMP SELECTION PROCEDURE <br /> E)D PERFORATION co- A PERFORATED LATERAL <br /> A. Determine pump capacity: 0...Com <br /> Gravity Distribution L ��< <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of •., �,"r N GMMr,Y.rad K'„ <br /> water use rate. .,�.. s.r.I. .d,.,..1:Mir:r„w www <br /> •M,.,«n..,..owl <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 a ■.1rr..�. ►-M��w�0""""..., ", <br /> .,M G.o !.r Too <br /> gallons per hour(45 gpm)to prevent build-up of pressure in drop box. '.,,. A Ly,1 ,2•,. <br /> .I 11.11 l.,.r <br /> o-M1L ^ <br /> Pressure Distibution • 0..1.,. 0-Mho-rimed 1 1, .1 <br /> MSM-. <br /> 3.a. Select number of perforated laterals 3 <br /> .. <br /> b. Select perforation spacing= 3 feet. 4OrN""'""^°ori7'°-"M <br /> wows.MOM fend lo,., <br /> c. Subtract 2 ft.from the rock layer length. <br /> Rock 6 2 ft.= 3' • feet. <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing=.2_ ,.ft.+.3_ft.=_'_spaces Required Perforation Discharge <br /> e. L-/-, spaces+1 = P.1 perforations/lateral in gallons per minute(gpm) <br /> f. Multiply perforations per lateral bby umber of laterals to Marge 7S2""1 <br /> i Ind.get total number of perforations. ,,idr�,, x Q, perf <br /> , ,= ' perforations. (feet) <br /> g. 4, x ,..t= _gpm. <br /> 1.Oa 0.56 0.74 <br /> SELECTED PUMP CAPACITY 3 I gpm 2.Ob 0.80 1.04 <br /> B.Determine head requirements: <br /> a. Use for single family homes <br /> 1. Elevation difference between pump and point of discharge. b. Use for all other applications <br /> )a feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure <br /> required at manifold if gravity system,zero. <br /> ,S.-- 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. <br /> Point of Dischari <br /> F.L.= I. is ft./100 ft of pipe ---,K_,b. Determine total pipe length from pump to discharge : "" <br /> Elevation Difference <br /> point. Add 25 percent to pipe length for fitting Pum _'7-,y, <br /> loss,or use a fitting loss chart. Equivalent pipe p <br /> length-1.25 times pipe length= <br /> / Li '-- x 1.25 = i 1) feet F-18b <br /> 1.5 inch 2.0 inch 3.0 inch <br /> c. Calculate total friction loss by multiplying gpm Friction loss per toonol'pm <br /> friction loss in ft/100 ft by equivalent pipe length. <br /> 10 0.69 0.20 <br /> Total friction loss= 1- 1. x 1V/ +100= 3 feet 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 /> 1 oL + S . <br /> + -3 25 3.73 1.11 0.16 <br /> (1) (2) (3c) 34__ 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 �0 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 /> 3/ gpm (Step A) with at least 0 feet of total head (Step B). <br />