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• s • <br /> Objective Example TPH Extraction Calculation <br /> Data <br /> Airflow 128 ACFM or 114 SCFM <br /> Pipe diameter 4 in <br /> Temperature 133° F = (460+ 133) = 593° Rankine (R) <br /> Velocity Pressure 0 12 in H2O <br /> Pressure 1 atmosphere = 14 7 PSI (assumed) <br /> (See attached Dwyer Bulletin No H-1 1 for air flow calculation) <br /> Concentrations TPH, as gasoline = 450 ppmv <br /> (See attached laboratory report) <br /> Calculation <br /> Assumptions Molecular weight of TPH, as gasoline equivalent to hexane is 86 2 lb/lb mole <br /> Molar volume of a gas is 359 ft311b-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 /> 114 ft 450 ft TPH 4920 R 86 2 Ib 1 ,440 min <br /> X X X X <br /> min 106 ft3 air 359 ft311b mole (530°R) Ib-mole day <br /> 16 5 lbs/day <br />