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� ��vi�l�'x-J 1 v/r�f� .r <br /> ' � OSTP Pump Tank Sizing, Dosing and Float urrrvERsrrY <br /> Mlnnesota Pollutfon and Timer Setting Design Worksheet OF MINNESOTA <br /> CorKrol Agency <br /> DETERMINE AREA AND/OR GALLONSPERINCH v11.U5.31 <br /> 1. A. Rectangle area=Length(L)X Width(W) �� <br /> 10.0 ft X 5.0 ft = 50.0 ft� <br /> B. Cirde area=3.14r�(3.14 X radius X radius) LenBth <br /> 3.14 X �Z ft ��� <br /> Radiu <br /> L. Tank model and manufac[urer: <br /> D. Get area from manufacturer ��ftZ <br /> E. Get gallons per inch from manufacturer C�Gallons per inch <br /> 2. Calculate Gallnns 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 Lhe gallons per foot <br /> the tank holds. Then dtvide that number by 12 to calculate the gallons per inch• <br /> (Area X 7.48 gallons/fY')/(12 inlft)_ <br /> 50.0 ft� X 7.48 gal/ft' + 12 in/ft = 31.2 Gallons per inch <br /> TANK CAPACRY <br /> 3. Errter the Designed Pump Tank Cnperiry(minimum provided in the table below): 1250 � Gallons <br /> 4. Calculate Totol Tnnk Valume <br /> A, Depth from bottom of inlet pipe to tank bonom: 40 in : _ -- .. <br /> B. Total Tank Volume =Depth from bottom of inlet pipe (Line 4.A)X Gollons/Inch (Line 2) <br /> 40 in X 31.2 Gallons Per Inch = 1246.7 Gallons '' • " <br /> 5. Calculate Volume to Cover Pump (fhe inlet of the pump must be at least 4inches from the bottom of <br /> the pump tank 8 2 inches of water covering the pump 1s recommended) <br /> (Pump and blak height+2 inches)X Gallons Per Inch (1 D or 2) <br /> {C�in + 2 inches) X 31.2 Gallons Per Inch = 312 Gattor�s _ <br /> DOSING VOLUME <br /> 6. Minimum Pumpout Volume -4X Votume of Distrtbution Piping: 72.6 Gallons <br /> -Line 17 of ihe Pressure Distribution or Line 11 of Non-leve! <br /> 7. Calculate Maximum Pumpout Votume (25%of Design Flow) <br /> p�gn��: 675 GPD' X 0.25 � _ • 168J5 Gntlons <br /> g, Select a pumpout votume�that meets both items abnve (Line 6&7): 112 Gallons <br /> 9. Galculate Doses Per Day=Design Flow:Dcsfng Votume . <br /> 675 gpd i 112 gal = 6.0 Doses .. <br /> 10. Calculate Drainbnck: <br /> A. Diameter of Suppty Ape� �inches <br /> B. Length of Supply Pipe= 45 feet <br /> C, Volume of Liquid Per Lineal Foot of Pipe = 0.170 Gallons/ft <br /> D. Drainback =Length cf Supply Pipe X Votume of Liquid Per Lineal Foot of Pipe <br /> 45 ft X 0.170 gal/ft = 7J Galtons <br /> 11. Toicl Dosing Volume =Dvsing Valume (Line 8)plus Drainback (Line 10.D) <br /> 9'12 gal� 7.7 g8l= '120 Gallons <br /> 12. Mirrimum Alarm Volume s Depth of alarm(2 or 3 inches)X gallons per inch of tank(Line 1 or 2) <br /> ��in X 31.i 66667 gal/in = 62.3 Galtons <br /> _ __ <br /> . <br />