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i <br /> Vapor Extraction System Sample Calculations <br /> Moore Petroleum,Inc, 14800 W Frontage Road,Manteca,CA <br /> ' VAPOR EXTRACTION SAMPLE CALCULATIONS <br /> InflujentVapor Flow Rate !Calculan <br /> Given the differential flow pressure gauge reading in inches of water, the corresponding system <br /> flow rate in cubic feet per minute(CFM) may be calculated These sample calculations will be <br /> ibased on the August 21, 1995 system operating data <br /> The following equation may be used to convert flow pressure to flow rate <br /> Vi 50 65�)—p <br /> i <br /> where, <br /> ' Vi — the system influent flow rate, in CFM <br /> Ap differential flow pressure, inches of water <br /> i This may be applied to the event which occured on August 21, 1995 in which a differential flow <br /> pressure of 0 81 inches of water was observed The corresponding influent flow rate is <br /> Vi , 50 65 )p , 50 56 0 81 - 45 CFM <br /> iThe flow rate may then be converted into standard cubic feet per minute (SCFM)by taking into <br /> account the influent flow temperature and the vacuum of the influent vapors On August 21, <br /> 1995 the influent temperature was 88 degrees Fahrenheit and the influent vacuum was at 23 <br /> iinches of water <br /> iTo begin with, the influent temperature, T,, needs to be converted to units of Rankine, R <br /> Ti - 88E F %459 72E F , 548 R <br /> i <br /> The influent vacuum, pi, is converted from inches of water to pounds per square inch, absolute <br /> (psis) This is accomplished in the following manner <br /> &23)) H2O 0 03609 psrg 83007 psrg <br /> 10 H2O <br /> pi &0 83007 psrg % 14 7 psra ► 13 9 psra <br />