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I <br /> • <br /> # ' <br /> PUMP SELECTION PROCEDURE <br /> i i <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. O',15-1/f- <br /> 1 3. Use value from design of pressure distributi n system. c',5 --• c).t,-rk A <br /> 1 I SELELI t U PUMP CAPACITY Y .o gpm I pgLength I L..-(--,-.s._, <br /> B.Determine head requirements: Point of Discha <br /> 1 1. Elevation difference between plump and point of discharge. IIevttion Diffemlca G/ <br /> H `f feet <br /> ii li 2. If pumping to a pressure distribution system,add five feet for pressure <br /> required at manifold F-18b <br /> '' 'feet <br /> il <br /> 3. Friction loss 1.5 inch 2.0 inch 3.0 inch <br /> a. Enter friction loss table with gpm and pipe diameter.( )_‘,/,e,4, <br /> feat Frklim lo.par 100 ft of pips <br /> Read friction loss in feet per 100 feet from page F-18. 10 0.69 0.20• <br /> F.L =off (n`f ft/100 ft of pipe �`c` t'i' •1a 1 .2828 0.28 <br /> ' b. Determine total pipe length 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 /> loss,or use a fitting loss chart. Equivalent pipe 20 2.47 0.73 0.11 <br /> len 1.25 times length= 30 3.23 1.11 0.162 <br /> pi 30 .23 1.55 0.23 <br /> • (e S X 1.25.= F( feet 35 7.90 2.06 0.30 <br /> c. Calculate total friction loss by multiplying �_' 11.0764 0.39 <br /> ";, friction loss in ft/100 ftequivalent length. - 0� 14.73 3.99 0.48 <br /> Total friction loss= <br /> R/� x 2- (c' ++100- c2 C> feet 50 3.99 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 /> 1 Li + 5- + ')'n <br /> (1) (2) (3c) <br /> TOTAL HEAD I / feet <br /> C. Pump selection <br /> 1. A pumpmust be selected to deliver at least D-7 <br /> O gpm (Step A)with at least <br /> / / feet of total head (Step B). ESTIMATED SEWAGE Rows 111 GALLONS PER one <br /> i41/4eER ripe or RESIOENcL' <br /> e[DROOMs I 11 1= LZ <br /> D. Total Pumpout Volume 2 300 223 leo sor <br /> ' 1. To maximize pump life select sump size for 4 to 5 pump operations per day. . 34 3300 ns ,�,�_ <br /> 6 oo gpd+4= /S u gallons per dose 6 r�o .ao zs„ r in <br /> r. <br /> 2. Calculate drainback 6 900 600 370 '�• <br /> 7 1060 -• 600 37O • or <br /> 1. Determine total pipe length, ice 1200 675 roe� feet. c•I,,,.w,. <br /> 2. Determine liquid volume of pipe, I7'4 gallons per 100 feet. (see page F-18) F-18a <br /> 3. Multiply length by volume: Drainback quantity=1 Pipe�,,, (irldlcs) Gallons per 100 feet <br /> /A feet x l7 -/ gallons/100 ft. _ gallons. 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 efficiency slightly but pumping energy costs are <br /> } usually a relatively small part of the total household energy costs. 1.5 10.58 , <br /> 3. Tota pump out volume equals dose volume+drainback -`2.5 24.87 <br /> i 5o gallons per dose+ / 1 gallons= / (o I Total Gallons 3 38.4 <br /> . 4 '' 66.1 <br /> 1 <br /> • <br />