Measuring Gas Velocity with the D-FL 100 Differential Pressure Bar

D−FL 100 Seite 3810. Calculation sheet D-FL 100Each D-FL 100 system is delivered with the calculation sheet. After the projectation is completed, thecustomer gets a copy of this data sheet. The calculations are done on MS Excel. The program isexplained in the next section.D-FL 100 calculations / circular stackCustomer: Example date: 01.07.99Ref. no.: XYZ due day:Stack:Order no.:power plantproject offerParameters of the flue gas channelflow N or [Nm^3/h] standard flow flow N or ERROR!!!flow or [m^3/h] flow (working conditions) flow orv 21,6 [m/s] gas velocity (working conditions)D 1930 [mm] inner diameterflange length: 120 [mm] wall tickness, standard 240 mmt 35,8 [°C] temperatureP 1013 [hPa] absolute pressureρn 1,293 [kg/Nm^3] standard densityk 0,7867 correction factorn 7 number of ring zonesProbe no. 2 according to the inner diameter 1, 2 or 3Results of the calculationN-flow 201129 [Nm^3/h] standard flowflow 227489 [m^3/h] flow (working conditions)v 21,6 [m/s] gas velocity (working conditions)rho 1,143 [kg/m^3] density (working conditions)dP 4,31 [hPa] resulting differential pressureThe following transmitters are recommended:zero point spandiff. press. transmitter span: dP/sq.rooted 0 5,3 [hPa]abs. press. transmitter sp.: P 900 1100 [hPa]temp. transmitter span: T 0 100 [°C]Calculation formula (standard volume flow):Vn= KxP*dP( 273, 15+T) * with:calculated: Kx = 53507Vnstandard volume flow [Nm^3/h]Ppressure (working cond.) [mbar or hPa]Ttemperature [°C]dPdifferential pressure [mbar or hPa]K 0 020763 D 2= , * * kxρNPage 1GmbH