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COMPUTATION SHEET <br />' PROJECT TITLE: PROJECT NO. OF90-002.01 <br /> DESCRIPTION: Flow Rate from Pitot Formula SHEET 2 OF 2 <br /> PREP. BY: DATE: CHKD BY: DATE: <br /> 1 <br />' CALCULATIONS <br /> I. Cross-sectional area of pipe: <br />' A = (sr/4)D2 <br />' II. Absolute pressure and temperature: <br /> Pb = 30 - V (inches of mercury) <br />' T= Ti + 460 (degrees Rankine) <br /> III. Density of soil vapor passing pitot tube: <br />' e = 1.325 (Pb/T) (from pitot tube manufacturer, simplified ideal gas law) <br /> IV. Velocity of soil vapor passing pitot tube: <br /> u = 1,096.2 (Vp/e;/2 (from Pitot tube manufacturer) <br />' Vp in inches of water, and a in pounds per cubic foot. <br /> u in feet per minute. <br /> V. Flow rate of soil vapor passing pitot tube: <br /> Q = uA <br /> dib/h:calcs.xls <br />