Laserfiche WebLink
. <br /> PUMP SELECTION PROCEDURE •.` <br /> , Determine pump capacity: ' <br /> • <br /> i• 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. /3-G ft - ,2,444-'" <br /> SELELi w PUMP CAPACITY gpmI rape Le+tth l <br /> B. Determine head requirements: Moir <br /> 1. Elevation difference between pump and point of discharge. Elevation Differ <br /> /0 feet <br /> 2. If pumping to a pressure distribution system,add live feet for pressure i0 1A-- <br /> required at manifold <br /> .I ,P-111b <br /> 3. Friction loss 1.3 inch 20 Melt 3.0 <br /> et pipe <br /> a. Enter friction loss table with gpm and pipe diameter. t ��n <br /> Read friction loss in feet per 100 feet from page F-18: - 10 0.69 0.20• <br /> F.L a 6-'77 ft./100 ft of pipe • . •12 1.s 0.38 <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 fittingloss chart. E valent 20 3.77 . 1 0. <br /> q� PiPQ' 23 3.73 1.11 0. <br /> length-1.25 ipe length• 30 5.23 1.55 0. <br /> timesx 1..25•- fig° feet 35 7.90 2.06 0. <br /> c. Calculate total friction loss i n 45 11.01 264 0. <br /> by multi p Yi 6 45 14.73 3. E O. <br /> -friction loss in ft/100 ft by equivalent pe length. 0. <br /> I <br /> Total friction loss. '- � x /87 4100 u 7-' feet 35 • 4.76 0. <br /> 60 <br /> i 4. Total head required is the sum of elevation difference, 5.60 0. <br /> i I I special head requirements,and total friction loss. - <br /> I /0 + 5 + 7. 5--- <br /> • (1) (2) (3c) <br /> • <br /> TOTAL HEAD o��-5 feet <br /> ' ; C. Pump selectionb-7 <br /> 1. A pump must be selected to deliver at least S gpm (Step A)with at least <br /> �� t <br /> 5 feet of total head (Step B), net or ncstoan <br /> f[ qW! t II Mt <br /> D. Total Pumpout Volume ! soo sb tb <br /> ' 1. To maximize pump life select sump sin for S,to 5 pump operations per day. , ; ',°,,s° ��',,; <br /> • 7 52) gpd+4 • /8 Y gallons per dose + 110 •eo 014 <br /> ro ' i2. Calculate drainback • to - so w <br /> 1. Determine total pipe length,/S feet. . a eros es ass <br /> • 2. Determine liquid volume of pipe, /7,9 gallons per 100 feet. (see page F-18) F-18a <br /> 3. Multiply length by volumes Drainback quantity: I��1a11�taw�' Gwen, • <br /> ,i S2 feet x f 7y gallons/100 ft. .926 gallons. L,: ". - r <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 1.25 <br /> 7.7 <br /> usually a relatively small part of the total household energy costs. ' 1.50 <br /> r �,� 10 <br /> 3. Total ump out volume equals dose volume +drainback 2.5 24 <br /> lions per dose+ 26, gallons• ,7/cli Total Gallons 3 3E <br /> '.144 , 4 6E <br /> • <br /> \ •- <br /> • •.. •!. ,.-. .. �.M -:rr+rf.., _ �.. a-1 1M t!M <br />