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Project 93011 <br /> Objective- Example TPH Extraction Calculation <br /> Data <br /> Airflow 117 ACFM or 114 SCFM <br /> Pipe diameter 4 in <br /> Temperature. 82° F = (460+82) = 5420 Rankine (R) <br /> Velocity Pressure• 0 11 in H2O <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 = 99 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 ft311b-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 /> 114 ft3 99 ft3 TPH 4920 R 86.2 Ib 1,440 min. <br /> X X X X <br /> min 108 ft3 air 359 ft3/lb mole (530°R) Ib-mole day <br /> 3 6 lbs/day <br />