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I <br /> 1 <br /> ASSUMPTIONS AND EQUATIONS (SVE SYSTEM CALCULATIONS) <br /> 1 <br />' 1. Conversion of flame ionization detector (FID) readings to equivalent <br /> hexane in parts per million per volume (ppmv): <br />' Conversion factor recommended by manufacturer of Sensidyne FID, <br /> assuming instrument calibration by methane <br /> 1 hexane concentration (ppmv) = FID reading (ppmv) X 0 32 <br /> 2. Conversion of actual cubic feet per minute (acfm) to standard cubic feet <br /> per minute (scfm): <br />' Note This conversion is unecessary if the vacuum at the point of <br /> measurement is less than 10 inches of water and the VelociCalc <br /> portable meter is used (instrument makes automatic conversion). <br /> Assumptions. <br /> - Standard temperature (70 degrees F) <br /> P � <br /> - Well gas is at ambient, standard temperature <br />' - Ideal Gas Law applies <br />' P1V1/rnRT1=P2V2/nRT2 Because of standard temperature and n=1, <br />' P1V1=P2V2 Where V=Q/A, Q is the flow rate and,A is <br /> the cross-sectional area of pipe (constant) <br /> Therefore, <br />' P1Q1 = P2Q2 Where P1 = static P (atm P - vacuum) <br /> Q1 = acfm <br />' P2 = atm P = 408 inches water <br /> Q2 = scfm <br /> 10 Q2 = P1Q1/P2 Functional equation <br />