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Obiective Example TPH Extraction Calculation <br /> Data <br /> Airflow 145 ACFM or 136 SUM <br /> Pipe diameter 4 in <br /> Temperature 106° F = (460+ 106) = 576° Rankine (R) <br /> Velocity Pressure 0 16 in we <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 = 34 ppmv (laboratory results) <br /> Calculation <br /> Assumptions Molecular weight of TPH, as gasoline equivalent to hexane is 86 2 Ib/lb mole <br /> Molar volume of a gas is 359 ft3/lb-mole (32°F, 1 atmosphere) <br /> TPH, as gasoline, Extraction Obs/day) <br /> Airflow X Concentration X Temperature correction X Molecular weight X Time conversion <br /> 136 ft 34 ft TPH 4920 R 86 2 Ib 1 ,440 min <br /> = X X X X <br /> min 10$ ft3 air 359 ft'/lb mole (530°R) Ib-mole day <br /> 1 5 lbs/day <br />