Measurements & Automation for Android
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Orifice Plate - Gas Mixtures

  Example Of Gas Flowrate
  Flowrate - Volume Std. Cond.
  Calculation of the flowrate [q] for a given differential pressure [Δp].
1. Input values
Calculated valuesSymbolUnitValue
Device diameter at 20 °Cd20mm84,000
Pipe diameter at 20 °D20mm150,000
Device materialsteel AISI 321, S32100
Pipe materialsteel 1030, 1034, 1035, 1038
Arithmetical mean deviation of the roughness profile (Steel new, seamless hot drawn)Ramm0,0300
Uniform equivalent roughnessRkmm0,1000
TappingCorner
Operating temperaturet°С2,00
Atmospheric pressurepakPa100,50
Upstream pressurepukPa1200,00
Differential pressureΔpkPa16,00
Operating conditions
Dynamic viscosityμμPa·s10,4961
Density, standard conditionsρskg/m³0,6800
Compressibility factorK-0,97170
Adiabatic indexk-1,31174

2. Calculation of intermediate values
Calculated valuesSymbolUnitValue
Absolute pressurepkPa1300,50
Thermodynamic temperatureT°K275,15
The temperature coefficient of change in the diameter of the device, caused by temperature deviations from 20 °CKd-1,000000
Device diameter at operating temperaturedmm84,0000
The temperature coefficient of change in the diameter of the pipe, caused by temperature deviations from 20 °CKp-1,000000
Pipe diameter at operating temperatureDmm150,0000
Diameter ratioβ-0,560000
Input rate factorE-1,05312
Density, operating conditionsρkg/m³9,5695
Expansibility factorε-0,99638

3. Final calculations
Calculated valuesSymbolUnitValue
1-st approximation
Reynolds numberRe-1000000
Discharge coefficientC-0,605036
The roughness coefficient of the internal surface of the pipeKr-1,00102
Volume flowrate, standard conditionsqvsm³/s2,86610
2-nd approximation
Reynolds numberRe-1576127
Discharge coefficientC-0,604617
The roughness coefficient of the internal surface of the pipeKr-1,00140
Volume flowrate, standard conditionsqvsm³/s2,86519
DeviationΔ%0,0003188
3-d approximation
Reynolds numberRe-1575624
Discharge coefficientC-0,604617
The roughness coefficient of the internal surface of the pipeKr-1,00140
Volume flowrate, standard conditionsqvsm³/s2,86519
DeviationΔ%0,0000002