# Gas Flow Rate and Maximum Gas Rate in Pipelines

The gas flow rate depends on various factors, including pipe dimensions, gas properties, and pipeline design parameters. Different equations are used to estimate gas flow rates under different conditions. Designing a long-distance pipeline for transportation of natural gas requires knowledge of fluid flow in pipeline (calculating flow capacity & pressure).

In gas transportation pipelines, the gas compressibility factor depends on pressure and the friction factor depends on flow rate which affects the pressure drop through the pipeline. Several correlations are developed to estimate gas flow capacity through pipelines considering these effects.

Reference: Petroleum Production Engineering, Boyun Guo, Xinghui Liu, Xuehao Tan

### Correlations

- Weymouth (Horizontal and Inclined Pipeline)
- Panhandle-B (Horizontal Pipeline)

### Input Parameters

Name | Input Value - Unit | Converted Value | Validity | Link to Calculation Page | |||
---|---|---|---|---|---|---|---|

Inlet Pressure | 600 | psi | |||||

Outlet Pressure | 200 | psi | |||||

Pipe Length | 200 | Mile | |||||

Pipe Inside Diameter | 2.06 | in | |||||

Pipe Inclination (Degrees from Horizontal) | 0 | Degrees | Positive value when pipe outlet elevation is bigger than pipe inlet | ||||

Gas Specific Gravity (ɣ_{g}) | 0.8 | SG | Average Surface Gas Gravity (ɣ_{g}) | ||||

Pipeline Average Temperature | 539.67 | °R | |||||

Relative Roughness (ε/d) More Details | 0.00005 | - | |||||

Friction Factor Calculation Method | 1 | ||||||

N2 Content | 0 | % | |||||

CO2 Content | 0 | % | |||||

H2S Content | 0 | % | |||||

Z-Factor Calculation Method | 3 | ||||||

Pseudo Properties Calculation Method | 2 | ||||||

Pseudo Critical Properties Correction Method | 2 | ||||||

CALCULATE | |||||||

## Results | |||||||

Correlation | Calculated Value | Warnings | Remarks | ||||

Weymouth (Horizontal and Inclined Pipeline) | |||||||

Gas Flow Rate | 0.21247 | MMscf/d | Calculations are done depending on the pipeline inclination | ||||

Maximum Gas Flow Rate | 0.22529 | MMscf/d | The maximum achievable gas rate for given pipe specifications when outlet pressure is assumed to be atmospheric | ||||

Panhandle-B (Horizontal Pipeline) | |||||||

Gas Flow Rate | 0.35483 | MMscf/d | Calculations are done considering zero inclination (Horizontal Pipeline) | ||||

Maximum Gas Flow Rate | 0.37669 | MMscf/d | The maximum achievable gas rate for given pipe specifications when outlet pressure is assumed to be atmospheric |