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PUMP SELECTION PROCEDURE • <br /> A. Determine pump capacity: <br /> 1. Minimum suggested is 600 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 home system is 2.700 <br /> gallons per hour(45 gpm)to.prevent build-up of pressure in drop box. <br /> 3. Use value from design of pressure distribution system. I/5 -oW'mA• <br /> 5-ELEC.'.ut)PUMP CAPACITY gpm pipe mgt L.//v G <br /> I <br /> B.Determine head requirements: Point of Desch <br /> 1. Elevation difference between pump point of discharge. <br /> II <br /> 1 evadoa Diffaatco /G <br /> 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold ,, <br /> ._ . ,} ,•_ •j •feetF-18b •l : . .. <br /> 3 Friction loss S '}i i":''':s - 1.5 inch 2.0 inch. 3.0 inch <br /> gpm Fricke low par 100 ft al pip. <br /> a.°Enter friction loss table with gpm and pipe diameter. <br /> _ ' Read friction loss in feet per 100 feet from page F-18. - l0 0.69 0.20- <br /> 12 0.96 0.28 <br /> -`-' F.L}`=- 26 Y ft./100 ft of pipe •14 1.28 038' <br /> ' b. Determine total pipeiength from pump to discharge 16 1.63 0.48. <br /> -. point. Add 25 percent to pipe length for fitting 18 2.03 0.60 <br /> 1 <br /> loss,or use a fittingloss chart. Equivalent i 20 2.47 0.1173 0.16 <br /> � pipe 2S 3.73 1.11 0.16 <br /> length-125 times pipe length 21 30 5.23 1.55 0.23 <br /> • //5" x 1.253a Iyer feet 35 7.90 2.06 0.30 <br /> c. Calculate total friction loss by multiplying 14,73 o.a& <br /> ,' .:'friction loss in ft/100 ft by equivalent pipe length.,O - 50 3.99 0.58 <br /> Total friction loss a I y,5 ,x r9 G ' +100= feet 55 4.76 . 0.70 <br /> 4. Total head required is the sum of elevation difference, 5.60 0.82 <br /> special head requirements,and total friction loss. <br /> • <br /> /0 + + ' O <br /> .._ . . (1) . (2) (30 <br /> s. <br /> • TOTAL HEAD /1Y feet - <br /> C. Pump selection L/ D-7 <br /> 1. A pump must be selected to deliver at least '/0 gpm (Step A)with at least <br /> /9 feet of total head(Step B). aTTIIAATm SEWAGE flows in cau.ons PER oar <br /> HUOMER TYPE Of RESIolNC2° <br /> ecnnooms t a = I az <br /> D. Total Pump out Volume `"' 2 300 as neo eror. <br /> 1. To maximize pump life select sump size for 4 to 5 pump operations per day. , 3 450 300 <br /> 4 600 375 na �°,;,, <br /> 4,00 gpd+4= /$-0 gallons per dose a 700 s�r 294 ,Q;I. <br /> x <br /> 2. Calculate drainback 7 1050 - eoo 370 . a.az <br /> 1. Determine total pipe length, 1/5 feet. e 1200 errs •oe Calumny <br /> 2. Determine liquid volume of pipe, 17,41 gallons per 100 feet. (see page F-18) • F-18a <br /> 3. Multiply length by volume: Drainback quantity -- DX)Gallons .- tf <br /> cct <br /> . //5 feet x/7,ci gallons/100 ft. =aU gallons. 1 4.4 <br /> •Suggested drainback quantity is 10 percent of pumped quantity. A larger drainback 1.25 7.77 <br /> percentage will decrease pump station efficiency slightly but pumping energy costs are <br /> usually a relatively small part of the total household energy costs. 1�-I <br /> • <br /> 3. Total pump out volume equals dose volume+drainback 2,5 24.87 <br /> /So gallons per dose+ . 2 D gallons= I 7 6 Total Gallons 3 ; 38.4 <br /> 4 - 66.1 <br />