# C195 – AP09-600 – Flow Rate Calculation (Compensation Method)

## Description

This calculation is used to calculate flow rate using a choice of algorithms commonly used by distributed control systems (DCS).

## References

Honeywell – Advanced Process Manager Control Functions and Algorithms – AP09-600

Kelton calculation reference C195

FLOCALC calculation reference F052

KIMS calculation reference K195

## Options

### Primary Variable

- Mass

- Volume

- Energy

Select option based on desired flow parameter.

### Input Method

- Linear Value

- % Linear

- % Square root

Select option based on whether the uncompensated flowrate is a linear or square rooted term.

### Calculation Method

- A: Liquids

- B: Gasses and Vapours

- C: Gasses and Vapours with Specific Gravity

- D: Volumetric Flow of Gasses and Vapours

- E: Steam

Select option based on properties of the measured fluid.

## Calculation

### Flow compensation term

The flow compensation term is calculated by:

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

A, B, C, D, E | = | Refer to the calculation method for which the formula is employed |

G | = | Specific gravity |

RG | = | Design Specific gravity |

P | = | Pressure |

RP | = | Design Pressure |

T | = | Temperature |

RT | = | Design Temperature |

X | = | Steam Compressibility |

RX | = | Design Steam Compressibility |

Q | = | Steam Quality Factor |

RQ | = | Design Steam Quality Factor |

Note: If input method is linear square root is not necessary.

### Compensated flow rate

The flow rate is calculated by:

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

C | = | Scale Factor |

C1 | = | 1^{st} correction constant |

C2 | = | 2^{nd} correction constant |

F | = | Uncompensated flow input |

COMPTERM | = | Flow compensation term |