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• <br /> PUMP SELECT ON PItOCUMS <br /> -_ . A. Determine pump capacity: <br /> 1. Minimum suggested is 600 gallons per hour(10 gpm) to stay ahead of <br /> water use rale. <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 press ire distributiiii ystem. <br /> SELECTED PUMP CAPACITY ?j gpm Pipe Length <br /> I I <br /> Point of Disc <br /> II. Determine head requirements: <br /> 1. Elevation difference between p Imp and point of discharge. Elevation Difference <br /> XI feetI <br /> 2. If pumping to a pressure distribution system,acid five feet for pressure I wu 1 <br /> required at manifold F-18b <br /> feet <br /> 3. Friction loss I 1.5 inch 2.0 inch 3M inch <br /> gpm rrlaion Mss per 10011 or pipe <br /> a. Enter friction loss table with gpm and pipe diameter. <br /> Read friction loss in feet per 1(X) feet from page F-18. 10 0.69 0.20 <br /> 12 0.96 0.28 <br /> F.L.= -- .fiCi 11.11(X)ft of pipe 14 1.28 0.38 <br /> b. Determine total pipe length from pump to discharge 16 1.63 0.48 <br /> point. Add 25 percent to !Aix!length for fitting 18 2.03 0.60 <br /> 20 2.47 0.73 0.11 <br /> loss,or use a fitting loss chart. Equivalent pipe 25 3.73 1.11 0.16 <br /> length - 1.25 limes pipe length= 30 5.23 1.55 0.23 <br /> ..5t) x 1.25 = tr.c-Y1 feet 35 7.90 2.06 (1.30 <br /> 40 11.07 2.64 0.39 <br /> c. Calculate total friction loss by multiplying 45 14.73 3.28 0.48 <br /> friction loss in ft/1(X) ft by equivalent pipe length. ) 50 3.99 0.58 <br /> • <br /> Total friction loss= (r•,`.•? x 3, l,( 4-100= 3A:i feet 55 4.76 0.70 <br /> 4. Total head required is the sum of elevation difference, 60 5.60 0.82 <br /> special head requirements,and total friction loss. <br /> • <br /> .j + + 4•J <br /> (1) . 12) (3c) <br /> TOTAL'MAD /0 feet . <br /> C. Pump selection D-7 <br /> 1. A pump must be selected to deliver aleast 14 gpm (Step A) with at least <br /> • fj�~ feet of total head (Step 11). _EST 1MA!E0 SEWAGE FLOWS 111 CALLOUS PER DAY <br /> I tI Nu BOER 7 YrE Or RESIDENCE° <br /> BEDROOMS 1 11 LII- LIC <br /> D. Total l'umpout Volume 2 300 225 leo 691: <br /> 1. To maximize pump life select sump si_e for 4 to 5 pump operations per day. 3 • eoa 30000 210 °°et <br /> < In <br /> /t gpd -'-4 = gallons per close 5 750 450 294 rI F+e r <br /> (' by 6 900 525 332 i3• <br /> 2. Calculate drainback7 1050 600 370 °' <br /> I. Determine total pipe length,_CPfeet. 0 1200 675 aoe Colon. <br /> 2. Determine liquid volume of pipe,/7,1/gallons per 100 feet. (see page F-18) 17-18a <br /> 3. Multiply length by volume: I)rainback quantity= 1 I'ipcdiameter Ouches) G:dlonsjcr 100 fro <br /> Z)feet x)],ti gam, /100 ft. = 1;7.1 igallons. 1 -4.49 <br /> 'Suggested drainback quantity is 10 percent of pumped quantity. A larger drainback 1.25 7.77 <br /> percentage will decrease pump station elliciel cy slightly but pumping energy costs are <br /> usually a relatively small part of the total household energy costs. 1.5 10.58 <br /> 2 17.43 <br /> 3. Total :ump out volume equals lose volume •)•drainbac 2.5 24.87 <br /> jQ__ <br /> . gallons per dose+c7,_ ;idiom= Q 'fatal Gallons 3 • 38.4 <br /> 4 66. 1 <br />