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OSTP Pump Tank Sizing, Dosing and Float <br /> and Timer Setting Design Worksheet UNIVERSITY v <br /> Minnesota Pollution <br /> Control Agency OF MINNESOTA .,. <br /> DETERMINE TANK CAPACITY AND DIMENSIONS Project ID: v 12.08.06 <br /> 1. A. Design Flow(Design Sum.IA): 750 GPD <br /> B. Minimum required pump tank capacity: Gal C. Recommended pump tank capacity: Gal <br /> MEASURED TANK CAPACITY(existing tanks): <br /> 2. A. Rectangle area=Length(L)X Width(W) <br /> ft X ft = ft2 Width <br /> B. Circle area=3.14r2(3.14 X radius X radius) <br /> 3.14 X 2 ft = ft2 4 ► <br /> Length <br /> c. Calculate Gallons Per Inch. There are 7.5 gallons per cubic foot. Therefore,multiply the area <br /> from 1.A or 1.B, by 7.5 to determine the gallons per foot the tank holds. Then divide that <br /> number by 12 to calculate the gallons per inch. • <br /> ft2 X 7.5 gal/ft3 + 12 in/ft = Gallons per inch <br /> D. Calculate Total Tank Volume <br /> Depth from bottom of inlet pipe to tank bottom: in <br /> Total Tank Volume =Depth from bottom of inlet pipe (Line 4.A)X Gallons/Inch (Line 2) <br /> in X 25.5 Gallons Per Inch = Gallons <br /> MANUFACTURER'S SPECIFIED TANK CAPACITY(when available): <br /> 3. A. Tank Manufacturer: darwin Note:Design calculations <br /> are based on this specific <br /> B. Tank Model: 1300 tank.Substituting a <br /> different tank model will <br /> C. Capacity from manufacturer: 1300 Gallons change the pump float or <br /> D. Gallons per inch from manufacturer: 25.5 Gallons per inch timer settings.Contact <br /> designer if changes are <br /> E. Liquid depth of tank from manufacturer: 51.0 inches necessary. <br /> DETERMINE DOSING VOLUME <br /> 3. Calculate Volume to Cover Pump (The inlet of the pump must be at least 4-inches from the bottom of <br /> the pump tank&2 inches of water covering the pump is recommended) <br /> (Pump and block height+2 inches)X Gallons Per Inch (2C or 3E) <br /> ( 16 in + 2 inches) X 25.5 Gallons Per Inch = 459 Gallons <br /> 4. Minimum Pumpout Volume -4 X Volume of Distribution Piping: 124.4 Gallons <br /> -Line 17 of the Pressure Distribution or Line 11 of Non-level <br /> 5. Calculate Maximum Pumpout Volume (25%of Design Flow) <br /> Design Flow: 750 GPD X 0.25 = 187.5 Gallons <br /> 6. Select a pumpout volume that meets both items above (Line 4&5): 188 Gallons <br /> 7. Calculate Doses Per Day=Design Flow_Dosing Volume Volume of Liquid in <br /> 750 gpd: 188 gal = 4.0 Doses <br /> Pipe <br /> 8. Calculate Drainback: <br /> A. Diameter of Supply Pipe= 2 inches Pipe Liquid <br /> B. Length of Supply Pipe= 80 feet Diameter Per Foot <br /> C. Volume of Liquid Per Lineal Foot of Pipe = 0.170 Gallons/ft (inches) (Gallons) <br /> D. Drainback =Length of Supply Pipe X Volume of Liquid Per Lineal Foot of Pipe 1 0.045 <br /> 80 ft X 0.170 gal/ft = 13.6 Gallons 1.25 0.078 <br /> 9. Total Dosing Volume =Dosing Volume plus Drainback 1.5 0.110 <br /> 188 gal+ 13.6 gal= 204 Gallons 2 0.170 <br /> 10. Minimum Alarm Volume=Depth of alarm(2 or 3 inches)X gallons per inch of tank 3 0.380 <br /> 2 in X 25.5 gal/in = 51.0 Gallons 4 0.661 <br />