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al i, <br /> Vapor Extraction System Sample Calculations <br /> Moore Petroleum,Inc, 14800 W Frontage Road,Manteca,CA <br /> VAPOR EXTRACTION SAMPLE CALCULATIONS <br /> bRuent <br /> Given the differential flow pressure gauge reading in inches of water, the corresponding system <br /> flow rate m cubic feet per minute (CFM) maybe calculated These sample calculations will be <br /> based on the August 21, 1995 system operating data <br /> The following equation may be used to convert flow pressure to flow rate <br /> Y, = 50 65 Ap <br /> where, <br /> V, = the system influent flow rate, m CFM <br /> Ap = differential flow pressure, inches of water <br /> This may be applied to the event which occured on August 21, 1995 m which a differential flow <br /> pressure of 0 81 inches of water was observed The corresponding influent flow rate is <br /> V, = 50 65 Ap = 50 56VO 81 = 45 CFM <br /> The 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 mfluent temperature was 88 degrees Fahrenheit and the influent vacuum was at 23 <br /> inches of water <br /> To begin with, the influent temperature, T,, needs to be converted to units of Rankme, R <br /> TI = 88° F + 459 72° F = 548 R <br /> The influent vacuum, p,, is converted from inches of water to pounds per square inch, absolute <br /> (psra) This is accomplished in the following manner <br /> -23" H2O • 0 03609 psrg = -0 83007 psrg <br /> 1.0/' H2O <br /> pl = -0 83007 psrg + 14 7 psra = 13 9 psra <br /> • <br />