# 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 |

P_{b} |
= | Pressure at base conditions |

T | = | Temperature at line conditions |

T_{b} |
= | Temperature at base conditions |

Z | = | Compressibility at line conditions |

Z_{b} |
= | Compressibility at base conditions |

ρ | = | Density at line conditions |

ρ_{b} |
= | Density at base conditions |

Q_{v} |
= | 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: