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i <br /> f <br /> drop (millimeters (mm) water) across a square edge orifice <br /> plate <br /> Ve = CK sqr (P) Q = AVe <br /> Where <br /> Ve= velocity In feet per minute (fpm) <br /> C = Orifice Coefficient = 0 65 (for orifice used) <br /> K = Constant = 794 6 mm water <br /> P = Pressure differential across the orifice <br /> Q = Flow rate in cubic feet per minute (CFM) <br /> A = Area orifice in square feet 1" = 0 00545 ft2 <br /> 3 " = 0 04909 ft2 <br /> Q = A X 0 65 X 794 6 X sgr (P) <br /> CALCULATIONS <br /> To calculate the pounds (lb) per day the concentration is <br /> multiplied by the volume of air produced in one day <br /> The lab reports the Concentrations (C) of the air sampling in <br /> ug/liter The first step is to convert this value to lbs/cf <br /> (pounds per cubic foot) . lug/l x 0 0000019/ug x 0 002205lb/g x <br /> 28 321/cf = 0 0000000621lb/cf <br /> The volume of air produced in one day, equals the flow rate (Q) x <br /> the time of flow. <br /> V = Q x T = cf/day = cf/min x 1440min/day <br /> The volume must be corrected to standard temperature and pressure <br /> (STP) <br /> P = Pressure = 14 7 lb/int @ STP <br /> V = Volume cf <br /> T = Temperature 3n degrees above absolute Zero = 491 58OR @ STP <br /> Using the Ideal Gas Law P1V1/T1 = P2V2/T2 <br /> Solving for V2 =P1V1T2/P2T1 <br /> Assuming P1. = P2 = 14 7 lb/int, P cancels from the equation <br /> leaving V2 = V1T2/T1 <br /> V1 = Q cf/m x 1440 min/day <br /> T2 = 491 58oR T1 = 459 58 + TOF at site <br /> V2 = Q cf/min x 1440 min/day x 491 580R/ (459 580 + TOF) <br /> X lb/day = C ug/l x 0 0000000621 lb 7 /uor cf. x Q cf /min ,r i 44n <br /> min/day x 491 . 580R/ (459 580 + TOF) <br /> Q for the Influent sample = The well flow rate + the air flow. <br /> Q for the Effluent = The well flow + the air flow + the fuel flow <br /> rate <br /> The fuel flow rate must be corrected to account for the change in <br /> volume from combustion. <br /> Since the gas volume depends on the number of molecules present <br /> the reaction of propane with oxygen produces an increase in <br /> 3 Regal 603 AIR RPT. 1/11/96 <br />