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Objective Example TPH Extraction Calculation <br /> Data <br /> Airflow 137 ACFM or 126 SCFM <br /> Pipe diameter. 4 in. <br /> Temperature 117° F = (460+82) = 542° Rankine (R) <br /> Velocity Pressure. 0 14 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 = 51 ppmv (laboratory results) <br /> Calculation <br /> Assumptions. Molecular weight of TPH, as gasoline equivalent to hexane is 86 2 Ib/Ib mole <br /> Molar volume of a gas is 359 ft3/Ib-mole (32°F, 1 atmosphere) <br /> TPH, as gasoline, Extraction (lbs/day) <br /> I <br /> Airflow X Concentration X Temperature correction X Molecular weight X Time conversion <br /> 126 ft3 51 ft3 TPH 4920 R 86 2 Ib 1,440 min. <br /> = X X X X <br /> min 108 ft3 air 359 ft3 Ab mole (530°R) Ib-mole day <br /> 21 lbs/day <br />