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F-17 '7 • FTEMY SELECTION PROCEDURE END PERFORATION OF A PERFORATED LITERAL A. Determine pump capacity: d�C~ Gravity Distribution T +I 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of d w.».,..F..r I-ar- water use rate. .`'M's�` .VAW 1'=«"e r.e"WIPM-) 2. Maximum suggested for delivery to a drop box of a home system is 2,700 "Umd gallons per hour(45 gpm)to prevent build-up of pressure in drop box. y;M�a � .Ed" Pressure Distibution `""5.4 L,. 3.a. Select number of perforated laterals 3 b. Select perforation spacing=.3_feet. �Pte; L.Y. c- Subtract 2 ft.from the rock layer length. -2ft.= L feet. d. Determine the number of spaces between perforations. Length perf.spacing=S,j,ft.+ -t, ft._�.spaces Required Perforation Discharge e. Ztz spaces+1= �)-*:%_p erforations/lateral in p U-per xW-te W- f. Multiply perforations per lateral by number of laterals to DIV d e 4I"tet34e ft&PW get total number of perforations. x e,l=_ 7 perforations. (feet) g W x 5s"F-1_ �� 1.0a 0.56 0.74 SELECrE"D PUMP CAPACITY 1, `7_gpm 2.Ob 0.80 1.04 - B.Determine head requirements: a.Use for single family homes 1. Elevation difference between pump and point of discharge. b.Use for all other applications I feet 2. If pumping to a pressure distribution system,five feet for pressure required at manifold if gravitys tem,zero. feet 3. Friction loss a. Enter friction loss table with gpm and pipe diameter. Pipe Length , Read friction loss in feet per 100 feet from table. Point of Diwbmzc F.L= D., ft./100 ft of pipe ............................. o.0 b. Determine total pipe length from pump to discharge Elevation Difference point. Add 25 percent to pipe length for fitting P 'dy loss,or use a fitting loss chart. Equivalent pipe length-1.25 times pipe length= F-18b 1 10 x 1.25= as S feet 1,5 inch 2.0 inch 3.0 inch c. Calculate total friction loss by multiplying gpm Maim las pa IOOR of pipe friction loss in ft/100 ft by equivalent pipe length. 10 0.69 0.20 Total friction loss- 'Aa,S x a.,I= +100= feet 12 0.96 0.28 4. Total head required is the sum of elevation difference, 14 1.28 0.38 special head requirements,and total friction loss. 16 1.63 0.48 18 2.03 0.60 20 2.47 0.73 0.11 II. + Sr + 40 25 3.73 1.11 0.16 (1) (2) (3c) 30 5.23 1.55 0.23 35 7.90 2.06 0.30 TOTAL HEAD a 40 11.07 2.64 0.39 feet_ 45 14.73 3.28 0.48 50 3.99 OM 55 4.76 0.70 G Pump selection 60 5.60 0.82 1. A pump must be selected to deliver at least � -; gpm (Step A)with at least a7 feet of total head(Step B).