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Vapor Extraction System Sample Calculations <br /> Moore Petroleum,Inc.,5491 "F"Street,Banta,CA <br /> Calculating Exhaust Stack Flow Rate <br /> The manufacturer of the RSI unit supplies the following information to aid in the calculation of <br /> the exhaust flow rate: <br /> stack ow SCFM) = RPM DISP(in 3) - e <br /> fl ( <br /> 2 revolutions -, 1728rn <br /> 3 <br /> ft 3 <br /> where; <br /> RPM = engine displacement (REV) <br /> MIN <br /> DISP = engine displacement (in 3) = 140 in 3 <br /> e = efficiency factor = 0.75 (per manufacturers guidelines) <br /> This process may be applied to the data collected.on September 19, 1995. On this date, the RSI <br /> unit was operating at 2,500 RPM. The resulting stack flow rate can be calculated in the following <br /> manner: <br /> 2500 Mnv 140(in) 0.75 <br /> stack flow(SCFM) _ - = 76 SCFM <br /> 3 <br /> 2 revolutions 17281n <br /> r <br /> ft 3 <br /> Therefore, with the unit operating at 2,500 RPM, the resulting stack flow rate is 76 SUM. <br />