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P'UMJ' SJ;LEClQN PR,QCE'QURE <br />A. Determine pump capacity: <br />1. Minimum suggested is 600 gallons per hour no gpm> to stay ahead of <br />water use rate. <br />2. Maximum suggesll!d tor delm!ry to a drop box of a home system is 2)'00 <br />gallons per hour (45 gpin) to pievent bl.lild-up of pressure in drop box. <br />3. Use value from design of pressun distribution system. <br />SELECTED PUMP CAPAOTY YO gpm <br />B. OetmniM had nquirements: . <br />1. Elr,ation dlffenmLoe between pump md point of discharge. <br />IJ::...:_feet <br />2. If pumping to a pn,ame distribution system, add ftve feet for pressure <br />3. <br />4. <br />required at manifold , ~,_ <br />Friction lo• <br />.. Enter friction lo9I table with gpm and pipe diameter. <br />Read friction loss in feet per 100 feet frcm page F-18. <br />F.L• :,.<.,4 ft./lOOftofpipe <br />b. Determine total pipe length &om pump to discharge <br />point. Add 2S peu.e:,t to pipe length for fitting <br />loss, or use a fitting loss chart. Equivalent pipe <br />length• 1.25 times p-iength • <br />· I <t: x 1.lS• .;i,3 l feet <br />c. CalcuJate total friction loss by multiplying <br />friction loss in ft/100 ft by equivalent pipe length. <br />Total friction lo•• -;;i_ ;::-, l x -:i. ; t..'i +100 • G!:-feet <br />Total head required is the sum of eleYation difference, <br />special head requirements, and total friction loss. <br />i !e, + < •~ <br />(1) (2) (3d <br />TOTALHEAD :>_ '.) feet <br />C. Pump selection <br />1. A pump must be selected to deliver at least~ gpm (Step A) with at least <br />~ ✓ feet of total head (Step B). ' <br />O. Total Pumpout Volume <br />1. To maximize pump life select sump size for 4 to S pump operations per day. . <br />t,, o o gpd •.4.• 1><0 gallons per dose <br />2. Calculate drainback <br />1. Determine total pipe length, ~ feet. <br />2. Determine liquid volume of pipe, ..J!£,gallons per 100 feet. (see page F-18) <br />3. Multiply length,: volume: Orainback quanf:ity • <br />~ feet x ~ gallons/100 ft. •~gallons. <br />• Suggested drainback quantity is 10 percent of pumped quantity. A larger drainbac.k <br />percentage will decreae pump station effidency slightly but pumping energy costs are <br />usually a relatively small part of the total household energy costs. <br />3. Total pump out volume equals dose volume + drainback <br />l ;[o gallons per dose+ 3 '3 gallons • · I ~ -:'.3 Total Gallons <br />· F-1S~ <br />Ptpel.mgtb <br />Point of Dischars <br />.-1 ~n!a.-;::---~Elenlim---. -::Diffe:ren==- <br />00 [~.o <br />F•18b <br />1-' inch 2.0inch 3.0inch <br />IPlll ,,.....,.1oofto1,.. <br />10 0.69 0.20· <br />12 0.96 0.28 <br />·14 1.28 0.38 <br />16 1.63 0.4.8 <br />18 2.03 0.60 <br />20 2.47 0.73 0.11 <br />25 3.73 1.11 0.16 <br />30 S.23 1.55 0.23 <br />35 7.90 2.06 0.30 <br />40 11.07 2.64 0.39 <br />45 14.73 3.28 0.48 .so 3.99 0.58 <br />5.5 4.76 0.70 <br />. 60 5.60 0.82 . I <br />D-7 <br />!STIMAT!D Stwlalr "-OWS lff CAI.L.CINS 1"1111 OA'I' <br />-El'I TY'"1!!: 01" "C510Vfc:I: 4 ~~ <br />2 <br />l <br />4 <br />5 • 7 • <br />t ll m C: <br />300 225 1110 10'11. <br />4S0 300 ue of <br />goo 375 zse _.,.. <br />'" 750 41'0 21M ,.'II!! t. <br />900 ~Z!l 332 ...... <br />ICleO · 600 l70 or m 1200 175 40tt Colli- <br />E-1_8a <br />diameter (inches) Ciallons -per 100 feet <br />1 <br />1.25 <br />1.5 <br />2 <br />2.5 <br />3 <br />4 <br />4.4 <br />7.77, <br />10.58 <br />17.43 <br />24.87 <br />38.4 <br />66.1 · <br />'