Measurements & Automation for Android
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ISA 1932 Nozzle - Gas Mixtures

  Example Of Gas Flowrate
  Flowrate - Mass
  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 °D20mm160,000
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
Operating temperaturet°С0,00
Atmospheric pressurepakPa101,33
Upstream pressurepukPa1200,00
Differential pressureΔpkPa16,00
Operating conditions
Dynamic viscosityμμPa·s17,3580
Density, standard conditionsρskg/m³1,2050
Compressibility factorK-0,99350
Adiabatic indexk-1,40700

2. Calculation of intermediate values
Calculated valuesSymbolUnitValue
Absolute pressurepkPa1301,33
Thermodynamic temperatureT°K273,15
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 temperatureDmm160,0000
Diameter ratioβ-0,525000
Input rate factorE-1,04030
Density, operating conditionsρkg/m³16,7177
Expansibility factorε-0,99271

3. Final calculations
Calculated valuesSymbolUnitValue
1-st approximation
Reynolds numberRe-1000000
Discharge coefficientC-0,973633
The roughness coefficient of the internal surface of the pipeKr-1,00082
Mass flowrateqmkg/s4,07891
2-nd approximation
Reynolds numberRe-1869972
Discharge coefficientC-0,973764
The roughness coefficient of the internal surface of the pipeKr-1,00082
Mass flowrateqmkg/s4,07946
DeviationΔ%0,0001343
3-d approximation
Reynolds numberRe-1870223
Discharge coefficientC-0,973764
The roughness coefficient of the internal surface of the pipeKr-1,00082
Mass flowrateqmkg/s4,07946
DeviationΔ%0,0000000