Laserfiche WebLink
SIZING OF PUMP STATION <br /> 1. Insert flow rate 750 gallons per day <br /> 2. Insert gallons per vertical inch from tank manufacturer 25.0 gallons per inch <br /> 3. Calculate gallons to cover pump sitting on 4 inch block with 2 inches of water <br /> 3 in pad + 12 pump hgt 2 H2O = 17.0 inches of water <br /> 17.0 H2O X 25 gpi = 425 gallons to cover pump <br /> 4. Calculate total pump out volume <br /> a. Calculate gallons per dose based on 4 pumping intervals per day <br /> 750 flow divided by 4 = 187.5 gallons per dose <br /> b. Calculate drainback <br /> (1) Pump pipe length & diameter = 185 length 2.0 in diam. <br /> (2) Determine liquid volume of pipe from chart per 100 feet = 17.43 <br /> PIPE DIAMETER GAL/100 FT PIPE DIAMETER GAL 1100 FT <br /> 1.25 7.77 2.50 24.87 <br /> 1.50 10.58 3.00 38.40 <br /> 2.00 17.43 4.00 66.10 <br /> (3) Multiply pipe length by volume divided by 100 to get drainback quantity <br /> 185.0 X 17.43 equals 3224.6 / 100 = 32 gallons <br /> 5. Calculate total pumpout volume by adding pump dose #4a plus drainback#4b3 <br /> 187.5 gallons + 32 gallons = 220 gallons pumpout volume <br /> 6. Calculate volume for alarm based on 3 inches and tank GPI <br /> 25.0 gpi X 3 = 75 gallons <br /> 7. Calculate gallons to cover pump #3, pumpout volume #5, and alarm volume #6 <br /> 425 plus 220 plus 75 equals 720 gallons WITHOUT <br /> RESERVE CAP. <br /> 8. If LUG requires 75% daily flow as reserve capacity, <br /> reserve capacity = 562.5 gallons <br /> 9. Minimum pump tank size WITHOUT reserve capacity equals 720 gallons <br /> 10. Minimum pump tank size WITH reserve capacity equals 1282 gallons <br /> 11. Float seperation distance equals pumpout volume#5 divided by tank gpi #2 <br /> 220 divided 25.0 gpi = 8.8 inches to tether float <br /> I <br />