Pipeline Engineering

Natural Gas Pipeline - Friction Factor

Steel Pipe Dimensions

Select "Custom" for manual pipe OD and wall thickness inputs.
Select "Custom" from "Pipe Nominal Size" above for manual pipe OD and wall thickness inputs.

PE Pipe Dimensions


Gas Data


Friction Factor

Friction Factor - Colebrook0.2534
Friction Factor - Modified Colebrook0.2535
Friction Factor - AGA NB-130.2536
Friction Factor - Weymouth0.2536
Friction Factor - Panhandle A0.2536
Friction Factor - Panhandle B0.2536

Friction Factor - Colebrook

Friction factor calculated for pipe roughness and Reynolds number; most popular equation for general gas transmission pipelines.

Friction Factor - Modified Colebrook

Modified Colebrook equation based on US Bureau of Mines experiments; gives higher pressure drop compared to original Colebrook equation.

Friction Factor - Weymouth

Does not consider pipe roughness; uses an efficiency factor used for high-pressure gas gathering systems; most conservative equation that gives highest pressure drop for given flow rate.

Friction Factor - AGA NB-13

Transmission factor calculated for partially turbulent and fully turbulent flow considering roughness, bend index, and Reynolds number.


Friction Factor - Panhandle A

Panhandle equations do not consider pipe roughness; instead, an efficiency factor is used; less conservative than Colebrook or AGA.

Friction Factor - Panhandle B