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 | = | 1st correction constant |
| C2 | = | 2nd correction constant |
| F | = | Uncompensated flow input |
| COMPTERM | = | Flow compensation term |