Laserfiche WebLink
PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution END PERFORATION OF A PERFORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of oyow cOV" <br /> water use rate. Topsoil <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 . <br /> ., of Geolextile <br /> Fftric( fa <br /> r- <br /> $allons Per hour(45 gpm)to prevent build-upof pressure in dropbox. `';..ti..LG.'.a•MySondL,>~r : IrZ. �Iay«o,"orc1rawce. ed <br /> rritA red rosin papvl <br /> er or e a Per lorotlon Drilled liortyonlolly <br /> Pressure Distribution r Into p hear Top <br /> 3. a. Select number of perforated laterals 3 �:P+ue a Leos, ay to Edge <br /> o Fbld R« .�.- •• of Rock Layer <br /> b. Select perforation spacing= �, ft. pHforotion:Located at <br /> c. Subtract 2 ft. from the rock layer length. - <br /> Clean Sand Layer Bottom o/Lateral <br /> yer ea8t -2 ft._��ft. - <br /> ortpinal son Property Srarifted <br /> Belvue Pladnq Surd Loyer <br /> d. Determine the number of spaces between perforations. <br /> Length perf.spacing= S-3_ft.+7 ft.= I ? spaces <br /> e. V-spaces+1 = I i, perforations/lateral TABLE OF PERFORATION DISCHARGES IN GPM <br /> f. Multiply perforations per lateral by number of laterals to Head Perforation diameter(inches) <br /> get total number of perforations. <br /> - x 14f' - perforations. 7/32 +�• <br /> ° . lateral- <br /> 1.0a 0S6 0.74 <br /> $ x ' Imo( - )$Pm• <br /> 1-5 0.69 <br /> 0.80 1.0044 <br /> P& T - <br /> 2.5 0.89 1.17 <br /> 3.0 0.98 1.28 <br /> SELECTED PUMP CAPACITY Lq !)gpm 4.0 1.13 1.47 <br /> 5.0 1.26 1.65 <br /> B.Determine head requirements: <br /> J. Elevation difference between um and int of dischar e. &Use 1.0 foot of head for residential systems. <br /> P P Po $ bUse 2.0 feet of head for other establishments <br /> 9 feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> feet <br /> 3. Friction loss Pipe Length <br /> a. Enter friction loss table with gpm and pipe diameter. Point of Discharge <br /> Read friction loss in feet per 100 feet from table. �stf <br /> F.L.= ft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to dischargep„n1p n, <br /> point. Add 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart. Equivalent pipe F-18b . <br /> length-1.25 times pipe length= <br /> 1.5 inch 2.0 inch 3.0 inch <br /> (_x 1.25 feet gpm Friction loss per 100 ft of pipe <br /> c. Calculate total friction loss by multiplying 10 0.69 0.20 <br /> friction loss in ft/100 ft by equivalent pipe length. 12 0.96 0.28 <br /> Total friction loss= (,7,-x a.L ti +.100=_�feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> special head requirements,and total friction loss. 18 2.03 0.60 <br /> s <br /> P� eq 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> 7 + _+ 30 5.23 1.55 0.23 <br /> (1) (2) (3c) 35 7.90 2.06 0.30 <br /> 40 11.07 2.64 0.39 <br /> ---50 1 �_ 3.28 0.48 <br /> - - 0.58 <br /> TOTAL HEAD ) feet 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> '`C. Pump selection <br /> '__/i. A pump must be selected to deliver at least Lt LZ gpm (Step A) <br /> with at least )'- feet of total head (Step B). <br />