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Vapor Extraction System Sample Calculations <br />' Moore Petroleum,Inc, 14800 W Frontage Road,Manteca,CA <br /> VAPOR EXTRACTION SAMPLE CALCULATIONS <br /> Influent Vapor Flow Rate Calculations <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 />' based 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 Ap <br /> where, <br /> V, = the system influent flow rate, in CFM <br /> Ap = differential flow pressure, inches of water <br /> 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 /> ' V, = 50 65Ap = 5056081 = 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 influent 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 Rankine, R <br /> r11 = bb- P * 4J9 IL" P = J4b 1{ <br /> ' The influent vacuum, p,, is converted from inches of water to pounds per square inch, absolute <br /> (psia) This is accomplished in the following manner <br /> ' -23" H20 y u'u"' 1"`g = -0 83007sr <br /> 1 0" HO <br /> 83007psig <br /> P, _ -u 83UUI psig + 14 psra = 13 9 psla <br />