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COMPUTATION SHEET <br />' PROJECT TITLE: PROJECT NO. OF90-002.01 <br /> DESCRIPTION: Flow Rate from Pitot Formula SHEET 1 OF 2 <br /> PREP. BY: DATE: CHKD BY: DATE: <br /> BASIS OF CALCULATION <br />' The following is a sample calculation which illustrates the calculation procudure for <br /> determining air flow rate from picot tube data <br /> ASSUMPTIONS <br />' 1. 2-inch diameter schedule 40 steel pipe has internal diameter of 2.067 inches. <br /> 2. Soil vapor passing pitot tube is in turbulent flow such that the center-line velocity <br /> is equal to the average velocity. <br />' 3. Atmospheric pressure is constant at approximately 30 inches of mercury. <br /> 4. Soil vapor is ideal gas. <br /> 5. Soil vapor density is equal to that of pure air. <br />' VARIABLES <br /> Tp = Temperature of soil vapor passing pitot tube <br /> V = Vacuum exerted on soil vapor passing pitot tube <br /> Vp = Velocity pressure measured by pitot tube <br /> Q = Flow rate of soil vapor <br />' u = Velocity of soil vapor passing pitot tube <br /> A = Cross-sectional area of pipe <br /> D = Diameter of pipe <br />' e = Density of soil vapor <br /> Pb = Absolute static pressure of soil vapor passing pitot tube <br /> T = Absolute temperature of soil vapor passing pitot tube <br /> 1 <br /> 1 <br /> dlb/h:calcs.xis <br />