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• PUMP SELECTION PROCEDURE <br /> A. Determine pump capacity: <br /> Gravity Distribution END PEAFOAATION OF A PEIWORATED LATERAL <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm)to stay ahead of reri..o.,., <br /> water use rate. • ' ' Ti <br /> eseird-11-415W-4- <br /> 2. Maximum suggested for delivery to a drop box of a home system is 2,700 <br /> gallons per hour(45 gpm)to prevent build=up of pressure in drop box. t...,�,sow tp., i W",., .i i., . <br /> it. ' <br /> Pressure Distribution o�' `"T'ra'm""•A'" M"' Ow „s4;""""'""t <br /> 3. a. Select number of perforated laterals 3 . �. a� e* <br /> tam <br /> b. Select perforation spacing= '21 ft. P.rtwriws laeOW or <br /> c. Subtract 2 ft.from the rock layer length. eget Send tat,, "Is"64 u <br /> -2ft.iff 53 .ft. --- , •, , ir <br /> taleas,sea Prepotly sevWed <br /> Was Piecing Send Leper <br /> d. Determine the number of spaces between perforations. <br /> Length pelf.spacing= , '�. ft.+ ? ft._ 17 spaces TABLE OF PERMEATION DISCHARC1ts IN CPM <br /> e. v' spaces+ 1 = 1 K perforations/lateral <br /> ' f. Multiply perforations per lateral by number of laterals to Head P"erforationdiameter(inches) <br /> get total number of perforations. <br /> "re• x Ip-�. ,_ ,„'/ perforations. -- �' �� <br /> 1.0. 0.56 0.74 <br /> g13`� �U 13 0.69 0.90 <br /> x;:)....4, <br /> 'T= q O gpm. 2.0b 0.80 1.04 <br /> 23 0.89 1.17 <br /> SELECTED PUMP CAPACITY 1 6 gpm 3.0 0.981.28 <br /> 4.0 11.1133 1.47 • <br /> 5.0 1.26 1.65 <br /> �, B.Determine head requirements: <br /> • 1. Elevation difference between um andause 1A foot of head for residential system. <br /> p p toy tnt of discharge. bUse 2.0 feet of head for other establishments <br /> k,. feet <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold <br /> S ,feet <br /> 3. Friction lossPipe Length <br /> I I <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. ) <br /> F.L.Er Z.GOft./100 ft of pipe Elevation Difference <br /> b. Determine total pipe length from pump to discharge Pump q; <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= 13 inch 2.0 inch 3.0 inch <br /> /00 x 1.25= 14-,5- feet gpm Friesian lam par 100 a at pips <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= ) ..S x a,it y +100= -2, feet 14 1.28 0.38 <br /> 4. Total head required is the sum of elevation difference, 16 1.63 0.48 <br /> 1special head requirements,and total friction loss. 20 2.47 0.73 • <br /> 20 2.47 0.73 0.11 <br /> 25 3.73 1.11 0.16 <br /> I ( . + • + .3 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 /> 45 14.73 3.28 0.48 <br /> TOTAL HEAD y feet 50 3.99 0.58 <br /> 55 4.76 0.70 <br /> 60 5.60 0.82 <br /> ^_. Pump selection <br /> 1. A pump must be selected to deliver at least Li D gpm (Step A) <br /> with at least a Li feet of total head (Step B). . <br />