C297 – API Natural Gas Viscosity Calculation
Description
This calculates the viscosity of a natural gas composition using the procedure outlined in the API Technical Data Book.
References
API Technical Data Book
Kelton calculation reference C297
FLOCALC calculation reference F094
Calculation
Pseudocritical Pressure
The pseudocritical pressure is calculated by:
| Where | ||
|---|---|---|
| Pci | = | Component critical pressure |
| xi | = | Component mole fraction |
Pseudocritical Temperature
The pseudocritical temperature is calculated by:
| Where | ||
|---|---|---|
| Tci | = | Component critical temperature |
| xi | = | Component mole fraction |
Viscosity
The viscosity of the gas composition is calculated by:
| Where | ||
|---|---|---|
| Mw | = | Molecular weight |
| ρr | = | Reduced density |
| μlp | = | Low pressure viscosity |