C248 – Gas Flow Rate Conversion from Qv

Description

This calculates an observed volume flow rate of a gas to a mass, standard volume, normal volume or energy flow rate.

References

Kelton calculation reference C248

Options

Calculate for

  • Observed volume
  • Mass
  • Standard volume
  • Normal volume
  • Energy

This option group is used to select which flow rate(s) are needed to be output.

Method

  • Density
  • Volume correction factor

This option allows the user to select whether to calculate a volumetric type flow rate using the equivalent gas density or by using a volume correction factor.

Calculate mass using

  • Line density
  • Standard density

Volume correction factor

  • User entered
  • Calculated

This option allows the user to enter a volume correction factor or have it calculated using PTZ inputs.

Calorific Value

  • Volume based
  • Mass based

This option allows the user to enter either a volume or mass based calorific value when calculating energy flow rate.

Standard density

  • User entered
  • Input as relative density

This option allows the user to select whether to enter standard density or enter a relative density, which will then be used to calculate standard density.

Calculation

Mass Flow Rate

The mass flow rate is calculated by:

If the density is calculated it is done by:

If the volume correction factor is calculated it is done by:

Where
P = Pressure at line conditions
Pb = Pressure at base conditions
T = Temperature at line conditions
Tb = Temperature at base conditions
Z = Compressibility at line conditions
Zb = Compressibility at base conditions
ρ = Density at line conditions
ρb = Density at base conditions
Qv = Observed volume flow rate

Standard Volume Flow Rate

The standard density is calculated by:

If the density method option is selected:

If volume correction factor option is selected:

Energy Flow Rate

The energy flow rate is calculated by:

If volumetric calorific value is applied:

If mass based calorific value is applied:

 

 

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