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F-15 <br />PUMP 5 <br />A. Determine pump capacity: <br />I. Minimum suggested is 600 gallons per hour (10 gpm) to stay ahead of <br />water ise rate. <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. <br />3.1 Use value from design of pressure distribute n s stem. <br />SELECTED PUMP CAPACITY gpm <br />B. Determine head requirements: <br />1: Elevation difference between pump and point of discharge.. <br />T { 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 loss <br />a. Enter friction loss table with gpm and pipe diameter. <br />Read friction loss in feet per 100 feet from page F-18. <br />F.L. _ Ir. 2IL ft./100 ft of pipe <br />b. Determine total pipe length from rump to discharge <br />paint. 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 />/O 0 x 1.25 - /2S feet f <br />C. Calculate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent 1 e 1 <br />Total friction loss =2.&3+frx /11 +100: ALES S feet <br />4. Total head required is the sum of elevation difference, <br />3� <br />special head requirements, and total friction lo5�. <br />+ s 3' <br />(><) (2) # 7 c) <br />TOTAL HEAD feet + <br />C. Pump selection <br />1. A pump must be selected to delivtir at least S7, >gpm (Step A) with at least <br />14.5 feet of total head (Step B). <br />D. Total Pumpout Volume <br />1. To maximize pump life scllxt sump size for 4 to 5 pump operations per day. <br />.900 gpd + 4 = 125 gallons per dose <br />2. Calculate drainback <br />1. Determine total pipe length, /00 feet. <br />2. Determine liquid volume of pipe, /?- y3gallons per 100 feet. (see page F-18) <br />3. Multiply length by volume: Drainback quantity = <br />tO0 feet x /7.YJgallons/100 ft. _ /7. ygallons. <br />Suggested drainback quantity is 10 percent of pumped quantity. A larger drainback <br />percentage will decrease pump station efficiency slightly but.pumping energy costs are <br />usually a relatively small pan of the total household anargy costs. <br />3. Total pump out volume equals dose volume + drainback <br />2 2 5 gallons per dose + /7. Y gallons - .2 V2. Y Total Gallons <br />pipe Length <br />t <br />Point of TTDisch. <br />Elevation Diffcrcncel Pump <br />F-18b <br />1.5 inch .0 inch 3.0 inch <br />SPM rytaim tmFPWIMIrorope <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.II <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 />0.30 <br />40 <br />I LC7 <br />0.39 <br />45 <br />14.73 <br />3 <br />0.48 <br />50 <br />.99 <br />0.58 <br />55 <br />4.76 <br />0.70 <br />60 <br />5.60 <br />0.82 <br />1 <br />_3.0 <br />•,WAGQ FLOWS IN GALLON: PER pay <br />TyrE 0I REs1nENCE 4 -- <br />1 13 1>Z rz <br />300 <br />225 <br />160 <br />cox <br />430 <br />300 <br />210 <br />of <br />4" <br />373 <br />256 <br />1o1i� <br />730 <br />900 <br />450 <br />525 <br />294 <br />332 <br />Tj; <br />1050 <br />600 <br />370 <br />01 <br />e <br />1200 <br />675 <br />406 <br />columns <br />100 <br />1.25 <br />7.77 <br />115 <br />14.58 <br />2 <br />17.43 <br />2.5 <br />24.87 <br />3 <br />38.4 <br />i - 4 <br />66.1 <br />