# Friction Factor (ƒ_{M})

Friction factor, in general, was found to be a function of the Reynolds number and pipe relative roughness. Relative roughness is defined here as the ratio of the absolute roughness ε of the pipe inside wall to the pipe inside diameter.

There are several formulae describing friction factors for different flow conditions.

Reference: Sucker-Rod Pumping Handbook, Gabor Takacs

### Correlations

- Darcy-Wiesbach (Moody)
- Guo and Ghalambor

### Input Parameters

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

Pipeline Diameter (d) | 2.259 | in | |||||

Relative Roughness (ε/d) | 0.0006 | - | |||||

CALCULATE | |||||||

## Results | |||||||

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

Darcy-Wiesbach (Moody) | 0.015 | - | For turbulent flow in gas wells and typical tubing strings | ||||

Guo and Ghalambor | 0.017 | - | Nikuradse friction factor correlation for fully turbulent flow in rough pipes |