Laserfiche WebLink
OSTP Pump Tank Design Worksheet UNIVERSITY <br />&*� Minnesota Pollution (Demand Dose) OF MINNESOTA <br />Control Agency <br />DETERMINE TANK CAPACITY AND DIMENSIONS <br />Pipe <br />Diameter <br />(inches) <br />Project ID: 071420175oiIIDA v 04,06.2017 <br />1. A. <br />Design Flow: <br />225 GPD <br />0.078 <br />B. <br />Min. required pump tank capacity: <br />0.110 Gallons/ft <br />500 <br />Gal <br />C.Recommended pump tank capacity: <br />500 Gal <br />2. A. <br />Tank Manufacturer: <br />Norwesco <br />B. <br />Tank Model: 500 Gallon Sphere Pum <br />10. Minimum Alarm Volume = Depth of alarm (2 or 3 inches) X gallons <br />C. <br />Capacity from manufacturer: <br />�in X 12.5 gal/in = <br />500 <br />Gallons <br />Note: Design calculations are based on this specific tank. <br />Substituting a different tank model will change the pump <br />float or timer settings. Contact designer if changes are <br />D. <br />Gallons per inch from manufacturer: <br />1.2.5 <br />Gallons <br />per inch necessary. <br />E. <br />Liquid depth of tank from manufacturer: <br />40.0 inches <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 the pump tank It 2 inches of water covering the pump is <br />recommended) <br />(Pump and block height + 2 inches) X Gallons Per Inch (2C or 3E) <br />( 12 in + 2 inches) X 12.5 Gallons Per Inch <br />4 Minimum Delivered Volume = 4 X Volume of Distribution Piping: <br />- Line 17 of the Pressure Distribution or Line 1 f of Non -level <br />5 Calculate Maximum Pumpout Volume (25% of Design Flow) <br />Design Flaw: 225 GPD X <br />6 Select a pumpout volume that meets both Minimum and Maximum: <br />7 Calculate Doses Per Day = Design Flow : Delivered Volume <br />225 gpd 45 gat = <br />8 Calculate Drainback: <br />0.25 - <br />45 Gallons <br />5.00 Doses <br />DEMAND DOSE FLOAT SETTINGS <br />11. Calculate Float Separation Distance using Dosing Volume. <br />Total Dosing Volume /Gallons Per Inch <br />48 gal : 12.5 gal/in = 3.9 Inches <br />12. Measuring from bottom of tank: <br />A. Distance to set Pump Off Float = Pump + block height + 2 inches <br />12 in + O in 14 Inches <br />B. Distance to set Pump On Float=Distance to Set Pump -Off Float + Float Separation Distance <br />14 in + 3.9 in = 98 Inches <br />C. Distance to set Alarm Float = Distance to set Pump -On Float + Alarm Depth (2-3 inches) <br />16 in + 2.0 in = 20 Inches <br />175 Gallons <br />37 Gallons (minimum dose) <br />Sb Gallons (maximum dose) <br />Volume of Liquid in <br />Pipe <br />Pipe <br />Diameter <br />(inches) <br />A. Diameter of Supply Pipe= <br />1.5 inches <br />B. Length of Supply Pipe = <br />30 feet <br />0.078 <br />1.5 <br />C. Volume of Liquid Per Lineal Foot of Pipe = <br />0.110 Gallons/ft <br />D. Drainback = Length of Supply Pipe X Volume of Liquid Per Lineal Foot of Pipe <br />30 ft X 0.110 gal/ft = <br />3.3 Gallons <br />9, Total Dosing Volume = Delivered Volume plus Drainback <br />0.661 <br />45 gal + 3.3 gat = <br />48 <br />Gallons <br />10. Minimum Alarm Volume = Depth of alarm (2 or 3 inches) X gallons <br />per inch of tank <br />�in X 12.5 gal/in = <br />25.0 Gallons <br />DEMAND DOSE FLOAT SETTINGS <br />11. Calculate Float Separation Distance using Dosing Volume. <br />Total Dosing Volume /Gallons Per Inch <br />48 gal : 12.5 gal/in = 3.9 Inches <br />12. Measuring from bottom of tank: <br />A. Distance to set Pump Off Float = Pump + block height + 2 inches <br />12 in + O in 14 Inches <br />B. Distance to set Pump On Float=Distance to Set Pump -Off Float + Float Separation Distance <br />14 in + 3.9 in = 98 Inches <br />C. Distance to set Alarm Float = Distance to set Pump -On Float + Alarm Depth (2-3 inches) <br />16 in + 2.0 in = 20 Inches <br />175 Gallons <br />37 Gallons (minimum dose) <br />Sb Gallons (maximum dose) <br />Volume of Liquid in <br />Pipe <br />Pipe <br />Diameter <br />(inches) <br />Liquid <br />Per Foot <br />(Gallons) <br />1 <br />0.045 <br />1.25 <br />0.078 <br />1.5 <br />0.110 <br />2 <br />0.170 <br />3 <br />0.380 <br />4 <br />0.661 <br />Inches for Dose: 3.9 in <br />Alarm Depth <br />19.9 in <br />Pump On <br />17.9 in <br />25.0 Gal <br />Pump Off <br />14.0 in <br />48 Gal <br />f75 Gal <br />