Laserfiche WebLink
, 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 /> 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= ' ' feet. 1.0a oM 0.74 <br /> c. Subtract 2 ft.from the rock layer length. lob 0.0 0.90 <br /> " = t�v feet. • <br /> 4 <br /> -2ft. <br /> a°d`Lny" `" ations. a Use 1.0 foot single homes. <br /> d. Determine the number of spaces between perfor b Use 2.0 feet for anything else. <br /> spacing .t..,...?_ft.+ ft.a O spaces <br /> Length perf. P g= <br /> e. spaces =+1 1 perforations/lateral <br /> -- <br /> f. Multiply perforations per lateral by number of laterals to 1,y , <br /> get total number of perforations. mil. x ) = g.,' perforations. <br /> g. fat xrisr7p= y'i gpm. <br /> SELEC.1 ED PUMP CAPACITY ti'7 gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between ppump and point of discharge. <br /> /a feet <br /> souti.,artalt system <br /> 2. If pumping to a pressure distribution system,five feet for pressure �,,, m <br /> required at manifold if gravity system,zero. ila <br /> S feet 'bel pir''"gt'' <br /> 3. Friction loss <br /> a. Enter friction loss table with gpm and pipe diameter <br /> - . .r.ti«+c hit= <br /> r <br /> Read friction loss in feet per 100 feet from table(F-14). P+P. t <br /> F.L.= s•y ft./100 ft of pipe ' -1 i , ''-'1,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 /> 9D x 1.25= ) ) a, 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= ,•2 y x /) /- +100= 4 feet How Rate <br /> 4. Total head required is the sum of elevation difference, gpm 1.5" 2" 3" <br /> special head requirements,and total friction loss. <br /> 20 I 2.47 0.73 0.11 <br /> 0 + + q 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 I "/ 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 /> 70 7.44 1.09 <br /> 1. A pump must be.selected to deliver at.least <br /> L4 `) gpm (Step A).with at least feet of total head (Step B). • <br />