Laserfiche WebLink
PLW SFi.RC' ON PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Petforation Discharges in GPM <br /> Head Perforation diameter <br /> Pressure Distibution fen inches <br /> 3.a. Select number of perforated laterals 3 7/32 1/4 <br /> b. Select perforation spacing= feet. 1.0a 0.56' 0.74 <br /> C. Subtract 2 ft.from the rock layer length. a 0. 0.90 <br /> (,a- -2 ft.= kc) feet. lob o.80 1.04 <br /> Red loyff ria, <br /> d. Determine the number of spaces between perforations. a Use 1.0 foot single homes. <br /> Length perf.spacing= C-o ft.+ I_ft.= ao spaces b Use 2.0 feet for anything elsw <br /> e. aO spaces+1 =�_perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to I N <br /> et total number of perforations. > & x a = L Z perforations. <br /> g. x =�'L gpm. <br /> SELECTED PUMP CAPACITY . H 7 gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure Soil°"W''""y"m <br /> required at manifold if gravity s stem,zero. <br /> _feet qp.>e'r'` <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter. Dee em <br /> Read friction loss in feet per 100 feet from table(F-14). ape ...._.. _ <br /> F.L.= 3 ..15' ft./100 ft of 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 /> SS x 1.25=.�_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. pipe dia. <br /> Total friction loss= 3 • L_x--k2--1-100=_ R feet Flow Rate 1.5" 2" 3" <br /> 4. Total head required is the sum of elevation difference, gpm <br /> special head requirements,and total friction loss. <br /> 20 2.47 0.73 0.11 <br /> .e" +Z_ 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 /> TOTAL HEAD feet 45 2.64 0.39 <br /> �_ 45 1 111..007 3.28_ 0.48 <br /> 50 13.46 -:9� 0.58 <br /> 55 4.76 0.70 <br /> C. Pump selection 60 5.60 0.82 <br /> 65 6.48 0.95 <br /> 770 7.44 1.09 <br /> 1. A pump must be selected to deliver at least <br /> �,_gpm (Step A)with at least 12' feet of total hemi (Step B). <br />