# C259 – AGA 7 & AGA 9 – Gas Flow Rate Calculation

## Description

This calculates the volume, standard volume or mass flow rate of a gas as specified in AGA 7 Appendix B. Note that AGA 9 refers to AGA 7 for these flow rate calculations.

## References

AGA Report No. 7 – Measurement of Natural Gas by Turbine Meters

AGA Report No. 9 – Measurement of Gas by Multipath Ultrasonic Meters

Kelton calculation reference C259

## Options

### Input flow rate

- Volume flow rate at flowing conditions
- Volume flow rate at base conditions
- Mas flow rate

This option is used to select the input flow rate

### Calculate

- Volume flow rate at flowing conditions
- Volume flow rate at base conditions
- Mass flow rate

Two of these three options will be available for selection depending on the input flow rate

## Calculation

### Volume flow rate at base conditions

Depending on the flow rate input, volume flow rate at base conditions is calculated by:

or

### Volume flow rate at flowing conditions

Depending on the flow rate input, volume flow rate at flowing conditions is calculated by:

or

### Mass flow rate

Depending on the flow rate input, mass flow rate is calculated by:

or

Where | ||
---|---|---|

P_{f} |
= | Absolute pressure at flowing conditions |

P_{b} |
= | Base pressure |

T_{f} |
= | Absolute temperature at flowing conditions |

T_{b} |
= | Base temperature |

Z_{f} |
= | Compressibility at flowing conditions |

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

ρ_{f} |
= | Density at flowing conditions |

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