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Project No.. 93.47-3011 <br /> Objective, Example TPH Extraction Calculation <br /> Data; <br /> Airflow 133 ACFM or 129 SUM <br /> Pipe diameter 4 inch (in ) <br /> Temperature 87° F = (460+87) = 5470 Rankine (R) <br /> (SCFM = 1 atmosphere, (70°F1530°R) <br /> Velocity Pressure. 0 14 in water column <br /> Pressure. 1 atmosphere = 29 92 inches mercury(assumed) <br /> (See attached Dwyer Bulletin No H-11 for air flow calculation) <br /> Concentrations TPH, as gasoline = 16 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 ft'/Ib-mole (32°F1492°R, 1 atmosphere) <br /> TPH, as gasoline, Extraction (lbs/day) <br /> Airflow X Concentration X Temperature correction X Molecular weight X Time conversion <br /> 129 ft3 16 ft3 TPH 4920 R 86 2 Ib 1,440 min. <br /> X X X X <br /> min 108 ft3 air 359 ft'/Ib mole (530°R) Ib-mole day <br /> 0 7 lbs/day <br />