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(��� OSTP Pum Tank Desi n Worksheet <br /> �' P g UNIVERSITY <br /> Minnesota Pollution (Demand Dose) OF MINNESOTA '�-�� <br /> Co�trol Agency <br /> DETERMINE TANK CAPACITY AND DIMENSIONS Project ID: v 04.20.2016 <br /> 1. A. Design F(ow (Desfgn Sum.1A): 750 GPD <br /> 6. Min.required pump tank capacity: 1000 Gal C.Rxommended pump tank capacity: 1500 Gal <br /> 2. A. Tank Manufacturer: Precast Systems � B. Tank Model: Darwin 1500 <br /> C. Capacity from manufacturer: 1500 Gallons Note:Design calculat(ons are based on this speciftc tnnk. <br /> Substituting o dijjerent tank mode(wil(chonge the pump <br /> D. Gallons per inch from manufadurer: 36.8 Gallons per inch f�oat or Nmer settings.Contact designer if changes ore <br /> necessory. <br /> E. Liquid depth of tank from manufacturer: 46.5 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 Fx 2 inches of water covering the pump <br /> is recommended) <br /> (Pump and block height+2 inches)X Gollons Per Inch (2C or 3E) <br /> (� in + 2 inches) X 36.8 Gallons Per Inch = 294 Gallons <br /> 4 Minimum Delivered Volume= 4 X Volume of Dirtribution Piping: <br /> -Line 17 of the Pressure Distribution or Line i l oj Non-(evel 124 Gallons(minimum dose) <br /> 5 Calculate Maximum Pumpout Volume (25%of Design Flow) <br /> Design Flow: 750 GPD X 0.25 = 188 Gallons(maximum dose) <br /> 6 Select a pumpout wlume that meets both Minimum and Maximum: 150 �auons Volume of Liquid in <br /> 7 Calculate Doses Per Day=Design Flow:Delivered Volume �� <br /> �so gpd: iso gal = �°os� Pipe Liquid <br /> 8 Calculate Drainback: Djd111E't2f Per Foot <br /> A. Diometer of Supp(y Pipe= ����h� (inches) ����0�15� <br /> B. Length of Supply Pipe= ���feet � �.045 <br /> J 1.25 0.078 <br /> C. Vo(ume of Liquid Per Llneal Foot of Pipe = 0.170 Galtons/ft 1.5 0.110 <br /> D. Drainback =Length of Supp(y Pipe X Volume of Liquid Per Linea!Foot of Pipe 2 0.,�70 <br /> 60 ft X o.t7o gal/ft = 10.2 Galtons <br /> 3 0.380 <br /> 9. Tota!Dos�ng Volume =Delivered Vo(ume plus Drainback 4 O.�,) <br /> 150 gdl+ 10.2 gdl= 160 Gallons <br /> 10. Minimum Alarm Volume=Depth of alarm(2 or 3 inches)X gallons per inch of[ank <br /> �iI1 X 36.8 gdl/i� = 710.4 Gallons <br /> DEMAND DOSE FLOAT SETTINGS <br /> 11. Calculate Float Separation Distance using Dosing Volume. <br /> Total Dosing Volume/Gollons Per Inch <br /> 160 gel = 36.8 gal/in= 4.4 Inches <br /> 12. Measuring from bottom of tank: Inches for pose: 4.4 in <br /> A. Distance to set Pump Off Float=Pump+block height+2 inches <br /> � �n+ � tn - �Inches Alarm Depth 16.4 in <br /> B. Distance to set Pump On Float=Distnnce[o Set Pump-Off Float +Float Separation Distance Pump On 13.4 in 110.4 Gal <br /> � ��+ 4.4 111 = 13 Inches Pump Off 9.0 in 160 Gal <br /> C. Distance to set Alarm Floot=Distance to set Pump-On Float +Alarm Depth (2-3 i�ches) 331 Gal <br /> 13 j�+ 3.0 jn= 16 Inches <br />