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Ae_is Project 93011 <br /> Ob ective- Example TPH Extraction Calculation <br /> Data <br /> Airflow 113 ACFM or 108 SCFM <br /> Pipe diameter 4 in <br /> Temperature 92° F = (460+92) = 552° Rankine (R) <br /> Velocity Pressure 0 1 in H2O <br /> Pressure 1 atmosphere = 14 7 PSI (assumed) <br /> (See attached Dwyer Bulletin No H-11 for air flow calculation) <br /> Concentrations TPH, as gasoline = 280 ppmv <br /> Calculation <br /> Assumptions Molecular weight of TPH, as gasoline equivalent to hexane is 86 2 lb/Ib mole <br /> Molar volume of a gas is 359 ft3/Ib-mole (32°F, 1 atmosphere) <br /> TPH, as gasoline, Extraction (lbs/day) <br /> Airflow X Concentration X Temperature correction X Molecular weight X Time conversion <br /> 108 ft3 280 ft3 TPH 492° R 86.2 Ib 1,440 min <br /> X X X X <br /> min 10' ft3 air 359 ft3/Ib mole (530°R) Ib-mole day <br /> 9 7 lbs/day <br /> I <br /> i <br />