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67/09/2008 10:37 952-955-5071 BURNS EXCAVATING PAGE 13 <br /> SIZING OF PUMP STATION <br /> 1. Insert flow rate 900 gallons per day <br /> 2. Insert gallons per vertical inch from tank manufacturer 36.0 gallons p�r inch <br /> 3. Calculate gallons to cover pump sitting on 4 inch block with 2 inches af water <br /> 4 in pad + 10 pump hgt 2 H20 � 16.0 inches of water <br /> 16.0 H20 X 37 gpi = 592 gallons to cover pump <br /> 4. Calculate tota( pump out volume <br /> a. Calculate gallons per dose based on 4 pumping intervals per day <br /> 900 flow divided by 4 = 225 gallons per dose <br /> b. Calculate drainback <br /> (1) Pump pipe length 8 diameter = 60 length 2.0 in diam, <br /> (2) Determine liquid volume of pipe from chart per 100 feet ^ 17.43 <br /> pIPE DIAMETER GAL/100 F�' PIPE DIAMETER GAL I 100 FT <br /> 1.25 7_77 2.50 2A.87 <br /> 1,50 10.58 3.00 38.40 <br /> 2.00 17.43 d,00 88.10 <br /> (3) Multiply pipe length by volume divided by 100 to get drainback quantity <br /> 60.0 X 17.43 equals 1045.8 ! 100 = 10 gallons <br /> 5. Calculate total pumpout volume by adding pump dose #4a plus drainback #4b3 <br /> 225.0 gallons + 10 gallons � 235 gallons pumpout volume <br /> 6. Calculate volume for alarm based on 3 inches and tank GPI <br /> 36.0 gpi X 3 = 108 gallons <br /> 7. Calculate gallons to cover pump #3, pumpout volume #5, and alarm volume#6 <br /> 592 plus 235 pfus 108 equals 935 gallons WITHOUT <br /> RESERVE CAP. <br /> 8. If LUG requires 75% daily flaw as reserve capacifiy, <br /> reserve capacity = 675 gallons <br /> 9. Minimum pump tank size WITHOUT reserve capacity equals 935 gallons <br /> 10_ Minimum pump tank size WITH �eserve capacity equals 1610 gaflons <br /> 11. Float seperation distance equals pumpout volume #5 divided by tank gpi #2 <br /> 235 divided 36,0 gpi = 6.5 inches to tether float <br /> PAGE 8 OF 12 <br />