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• E-31 • <br /> Figure E-25: Pump Selection Worksheet <br /> • <br /> PUMP SELECTION PROCEDURE <br /> 1. Determine pump capacity: <br /> A. Gravity distribution <br /> 1. Minimum required discharge is 10 gpm <br /> 2. Maximum suggested discharge is 45 gpm. For other it <br /> establishments at least 10% greater than the water supply rate, / - soy(/eoTrne(1f System <br /> but no faster than the rate at which effluent will fl4v out of the .1 6,46. i • 4 " <br /> distribution device. 0 to: Pipe <br /> ;:,.• B. Pressure distribution wet long 2A.elevorion <br /> difference <br /> 'A-,4(.-51., See pressure distribution work sheet pipe 7 <br /> 'I.Ftom A or B Selected pump capacity: ...d gpm <br /> • <br /> .- K Determine • <br /> pump head requirements: <br /> Is ',A.Elevation difference between pump and point of discharge? . <br /> feet • <br /> "r' B.Special head requirement? (See Figure at right - Special Head . <br /> -i'::. Requireme ts) <br /> feet Special Head Requirements <br /> ;C Calculate Friction loss Gravity Distribution . <br /> •-' '+.' 1. Select pipe diameter ...-7-C in <br /> Pressure Distribution C°5-ft <br /> h : 2. Enter Figure E-9 with gpm (1A ore) and'pipe diameter (Cl). •• <br /> Read friction loss in feet per 100 feet from Figure E-9 • <br /> ,5 Friction Loss.•= f,s,$ ft/100ft of pipe Friction Loss In Plastic Pipe <br /> „:0';'3. Determine total pipe length from pump.discharge to soil nominal • <br /> y�` ;:treatment discharge point. Estimate by adding 25percent to pipe a�1 ter <br /> � p p flow rate 1.5' 2" 3" <br /> .'",,-:7;:',i- <br /> � , '',length for fitting loss. Total pipe ength times 1.25 = equivalent • gpm <br /> x j4. pipe length 20 2.47 0.73 • 0.11 <br /> c-'•.-- <br /> J< /So feet x 1.25= /f feet 25 3.73 1. 0.16 <br /> '-'-.-4. Calculate total friction loss by multiplying friction loss (C2) 5 _ • • • <br /> , ;yin ft/100 ft by the equivalent pe length (C3) and divide by 100. 35 6.96 2.06 0.30 <br /> -`'_ ' Sg ft/100fr x ! P11 +100 = G:77.! ft 40 8.91 2.04 0.39 <br /> ::D.,.Total head required is the sum of elevation difference (A), special . . 11&_3. 4._Q.4 . <br /> .:A-.head requirements (B), and total friction loss (C4) 50 13.46 3.99 0.58 <br /> h-:'I.:.'-.: ft i ,S--- ft+ awl ft = 55 4.70 0.70 <br /> - -:::•-A-; Total head: A4'7 feet i _ ...‘,..'.:.5.00 •:e.,11.82 <br /> Pump selection 65 6.48 0.95 <br /> � 70 • 7.4.4 1.09 <br /> A pump must be selected to deliver at least -f e gpm <br /> for B) with at leasti4. 9 feet of total head (21)) <br /> 7. <br /> ;ezeb �/��,,I�`have comple this work in accordance with applicable ordinances rules <br /> /and <br /> flaws. <br /> ' ',' <br /> Jett_ <br /> (signature) /93/2.942, (license Y) f 7/ 4/.9_ (date) <br />