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OSTP Pump Tank Sizing, Dosing and Float <br /> Minnesota Poliut[on and Timer Setting Desi�n Worksheet UNIVERSITY <br /> Control Agency OF MINNESOTA .,; <br /> DETERMINE AREA AND/OR GALLONS PER INCH <br /> 1. A. Rectangle area=Length(L)X Width(W) <br /> Width <br /> �ft X � ft = �ftZ <br /> B. Circte area=3.14r�(3.14 X radius X radius) <br /> Length <br /> 3.14 X �2 ft - �ftZ <br /> H <br /> C. Tank modet and manufacturer(optional): Radiu <br /> D. Get area from manufacturer �ftZ <br /> E. Get gallons per inch from manufacturer 28.0 Gallons per inch <br /> 2. Calculate Gollons Per Inch: <br /> There are 7.48 gallons per cubic foot. Therefore, multiply the area from 1.A, 1.B,or 1.0 by 7.48 to determine the gallons per foot <br /> the tank holds. Then divide that number by 12 to calculate the gallons per inch. <br /> (Area X 7.48 gallons/ft;)/(12 in/ft)_ <br /> � ft2 X 7.48 gal/ft' � 12 in/ft = 28,0 Gallons per inch <br /> TANK CAPACITY <br /> 3. Enter the Pump Tank Capacity(minimum provided in the table below): 1000 Gallons <br /> 4. Calculate Total Tank Volume <br /> A. Depth from bottom of inlet pipe to tank bottom: 36 in <br /> B. Total Tank Volume =Depth from bottom of in(et pipe (Line 4.A)X Gallons/Inch (Line 2) <br /> 36 in X 28.0 Gallons Per Inch = 1008.0 Gallons <br /> 5• Calculate Volume to Cover Pump (The intet of the pump must be at least 4-inches from the bottom of <br /> the pump tank Ft 2 inches of water covering the pump is recommended) <br /> (Pump and block height+2 inches)X Gallons Per Inch (1D or 2) <br /> ( 12 in + 2 inches) X 28.0 Gallons Per Inch = 392 Gallons <br /> DOSING VOLUME <br /> 6. Minimum Pumpout Volume -5 X Volume of Distribution Piping: 154.3 Gallons <br /> -Line f7 of the Pressure Distribution or Line 11 of Non-level <br /> 7. Calculate Maximum Pumpout Volume (25%of Design Flow) <br /> Design Flow: 750 GPD X 0.25 = 187.5 Gatlons <br /> 8. Select a pumpout volume that meets both items above (Line 6&7): 160 Gallons <br /> 9. Calculate Doses Per Day=Design Flow=Dosing Volume <br /> 750 gpd = 160 gdl = 4.7 Doses <br /> 10. Calculate Drainback: <br /> A. Diometer of Suppty Pipe= �inches <br /> B. Length of Supply Pipe= 40 feet <br /> C. Volume aj Liquid Per Lineal Foot of Pipe = 0.170 Gallons/ft <br /> D. Drainback =Length of Supply Pipe X Volume of Liquid Per Lineal Foot of Pipe <br /> 40 ft X 0.170 gal/ft = 6.8 Gallons <br /> 11. Total Dosing Volume =Dosing Volume (Line 8)plus Drainback (Line 10.D) <br /> 160 gal + 6.8 gal= 166.8 Galtons <br /> 12. Minimum Alarm Volume=Depth of alarm(2 or 3 inches)X gallons per inch of tank(Line 1 or Z) <br /> �in X �gal/in = �Gallons <br />