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R <br /> Obiective Example TPH Extraction Calculation <br /> Data <br /> Airflow 142 ACFM or 130 SUM <br /> Pipe diameter 4 inch (in } <br /> Temperature 119" F = (460+ 119) = 579° Rankine (R) <br /> (SCFM = 1 atmosphere, (70°F1530°R) <br /> Velocity Pressure 0 15 in water column <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 = 9 4 ppmv (laboratory results) <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 ft'/Ib-mole (320F/4920R, 1 atmosphere) <br /> TPH, as gasoline, Extraction (lbs/day) <br /> = Airflow X Concentration X Temperature correction X Molecular weight X Time conversion <br /> I <br /> 130 ft3 9.4 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 /> = 0 4 lbs/day <br /> i <br />