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Project No 9347-3011 <br /> Objective Example TPH-G Extraction Calculation <br /> i <br /> Data <br /> Airflow 121 ACFM or 111 SCFM <br /> Pipe diameter 4 inch (En ) <br /> Temperature 120° F = (460+120)= 580° Rankine (R) <br /> (SCFM = 1 atmosphere, (70°F15300R) <br /> Velocity Pressure 0 11 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 = 28 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 ft3/lb-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 /> 111 ft3 28 ft3 TPH 4920 R 86 2 Ib 1,440 min <br /> = X X X X <br /> min 106 ft3 air 359 ft311b mole (5300R) Ib-male day <br /> 1 lb/day <br />