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Objective Example TPH Extraction Calculation <br /> Data <br /> Airflow 141 ACFM or 131 SUM <br /> Pipe diameter 4 inch (in ) <br /> Temperature 112° F = (460+ 119) = 5790 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 = 12 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 cias is 359 ft3/1b-mole (32°F1492°R, 1 atmosphere) <br /> TPH, as gasoline, Extraction (lbsldCemperature <br /> = Airflow Concentration X correction Molecular weight Time conversion <br /> 131 ft3 12 ft3 TPH 4920 R 86 2 lb 1,440 min <br /> = X X X X <br /> min 106 ft3 air 359 ft3/lb mole (530°R) Ib-mole day <br /> 0 5 lbs/day <br />