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DOSING r..MBER SIZING <br />1. Determine area <br />A. Rectangle area = L x W <br />I ft X ltt = <br />B. Circle area= 3.14 x radius 2 <br />3.14 X 12ft = <br />C. Get area from manufacture ltt2 <br />2. Calculate gallons per inch <br />There are 7.5 gallons per cubic foot of volume, therefore multiply the area (1A, B or C) <br />times the conversion factor and divide by 12 inches per foot to calculate gallon per inch. <br />Surface area x 7.5 / 12 = _____ tt2 x 7.5 I 12in/ft = <br />3. Calculate total tank volume <br />A. Depth from bottom of inlet pipe to tank bottom = 64 <br />B. Total tank volume= depth from bottom of inlet pipe to tank bottom(3A) x gal/in(2) <br />= 64 in x 8.1 gal/in = <br />4. Calculate gallons to cover pump (with 2-3 inches of water covering pump) <br />(Pump and block height + 2 inches) x gallon per inch <br />(I 2 j+ 2in)x 8.1 gal/in= <br />5. Calculate total pumpout volume <br />0 <br />tt2 <br />8.1 <br />lin <br />518.4 <br />32.4 <br />A. Select puml size for 4-5 doses per day. Gallon r dose= gpd (see Figure A-1) I doses per day= I 450 _ gpd / I 5 _ doses/day = 90 gallons <br />A-1 Estimated Sewage Flows in GPO <br />Number of <br />Bedrooms Class I Class II Class Ill Class IV <br />2 300 225 180 60%of <br />3 450 300 218 the <br />4 600 375 256 values <br />5 750 450 294 in the <br />6 900 525 332 Class I, <br />7 1050 600 370 llorll <br />8 1200 675 408 columns <br />B. Calculate drainback <br />1. Determine total pipe length 10.0 <br />l:al/ft (see figure E-20) 2. Determine liquid volume of pipe, 0.25 <br />3. Drainback quantity = 10.0 ft(5B1) x 0.25 gal/ft(5B2) = <br />C. Total pump out volume= dose volume(5A) + drainback (5B3) <br />90 gallons+ 2.5 gallons= 92.5 <br />6. Calculate float separation distance (using total pumpout volume) <br />Total pumpout volume(5C) / gal/inch(2) <br />92.5 gal I 8.1 gal/in = 11.4 inch <br />7. Calculate volume for alarm (typically 2 -3 inches) <br />Alarm depth (inch) x gallon/inch(2) = 4 !in X 8.1 <br />8. Calculate total gallons= gallons over pump(4) + gallons pumpout(5C) + gallons alarm(?) <br />32.4 gal + 92.5 gal + 32.4 gal = <br />9. Total tank depth= total gallons(8) I gallon/in(2) <br />157.3 gallons I 8.1 gal/in = 19.4 in <br />Recommended <br />Calculate reserve capacity (75% of the daily flow) <br />Dail flow x O .75 = 450 X 0.75 = 337.5 allons <br />tt2 Length <br />gallon per inch <br />gallons <br />gallons <br />@ <br />Legal Tank: <br />500 gallons or <br />100% the daily flow <br />or Alternating Pumps <br />E-20 Volume of Liquid in Pipe <br />Pipe Diameter Liquid per foot <br />inches gallons <br />1 0.045 <br />1.25 0.078 <br />1.5 0.110 <br />2 0.170 <br />2.5 0.250 <br />3 0.380 <br />4 0.660 <br />2.5 gal 1fl01 <br />ri r:·.: <br />gal <br />gal/in = 32.4 gal <br />__ 15_7_.3 __ gal <br />Page 1 of 1