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- F-17 <br />A. Determine pump capacity: <br />Gravity Distribution <br />1. Minimum suggested is '-W gallons per hour (10 gpm) to stay ahead of <br />water use rate. <br />2. Maximum suggested for delivery to a drop box of a holre system is 2,7CO <br />gallons per hour (45 gpm) to prevent build-up of pressure in drop box. <br />Pressure Distibution <br />3. a. Select number of perforated laterals <br />b. Select perforation spacing = 3 feet. <br />C. Subtract 2 ft- from the rock layer length. <br />„�,ur-,'4', - 2 Et. _- �! �P feet <br />d. Determine the number of spaces between perforations. <br />Length perf.spacing .'/P ft.+ _? ft._ 6 spaces <br />e. IC spaces + 1 = /7 perforations/lateral <br />f. Multiply perforations per lateral by3 number of laterals to <br />t total number of perforations. x-�= 5/ perforations. <br />9�.7'Ti-rr =-L?- gpm. <br />SELECTED PUMP CAPACITY ? 3 -gpm <br />Determine head requirements: <br />Elevation difference between pump and point of di <br />., feet <br />If pumping to a pressure distribution system, five feet 'or pressure <br />required at manifold if gravity system, zero. <br />feet <br />Friction loss <br />a. Enter friction Ioss table with gpm and pipe diameter. <br />Read friction loss in feet per 100 feet from table. <br />F.L = . / ft./100 ft of pipe ro- <br />b. Determine total pipe length from pump to discharge <br />point. Add 25 percent to pipe length for fitting <br />loss, or use a fitting loss chart. Equivalent pipe <br />length -1.25 times pipe length = <br />SD x 1.25 = / 8 feet <br />c. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction loss= ! • x / .5'0 +100 = 3. 6 feet <br />Total head required is the sura of elevation difference, <br />spacial head requirements, and total friction loss. <br />Y <br />+ 7 + _l <br />(1) (2) (3c) <br />TOTAL HEAD _5 feet <br />C Pump selection <br />1. A pump must be selected to deliver at least <br />C = ' gpm (Step A) with at least /5 feet of total head (Step B). <br />C/D PCTFC:LTIC. OF . K,"FrnaTED LATCAAL <br />kr Tp.W • <br />rl G..I.IIY. FobN (r lo,• <br />' Lb1 �� I.trti � YaA M ,•tw. r.r-IYP .wwM <br />�M • . M CM I�.r 1 � Nor.l on l.11, <br />•r ��i ►Iw �Y lMu I=• t. I.{r <br />f-11 rl Pr[{ Lq.r <br />" Prlr Mbn 1.u1.� .1 <br />RNuimd Pcrfontion Dinha Te <br />1n gallons per minute (gprn <br />Discharge <br />Head <br />UCCO <br />.Si .ap..r <br />­% PM <br />1.0a <br />0.56 <br />0.74 <br />2.0b' <br />0.80 <br />1.04 <br />a. Use for single family homes <br />b. Use for all other applications <br />Pipe Length <br />Point of TTDischar <br />Elevation DifferencePtunp <br />F•18b <br />1.5 inch 2.0 inch 3.0 inch <br />91-M Fria m lou pv I N ft c(p;pc <br />10 <br />0.69 <br />0.20 <br />12 <br />0.96 <br />0.28 <br />14 <br />1.28 <br />0.38 <br />16 <br />1.63 <br />0.48 <br />18 <br />2.03 <br />0.60 <br />20 <br />2.47 <br />0.73 <br />0.11 <br />25 <br />3.73 <br />1.11 <br />0.16 <br />30 <br />5.23 <br />1.55 <br />0.23 <br />35 <br />7.90 <br />2.05 <br />0.30 <br />40..11.07 <br />2.64 <br />0.39 <br />45 <br />14.73 <br />3.23 <br />0.48 <br />50 <br />3.99 <br />0.58 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />