### Natural Gas Pipeline - Flow Rate

**Steel Pipe Dimensions **

**PE Pipe Dimensions **

**Gas Properties**

**Pipeline Design Parameters**

**Gas Flow Rate at Base Conditions**, ft³/day (SCFD)

**Gas Flow Rate - Colebrook**

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

**Gas Flow Rate - Modified Colebrook**

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

**Gas Flow Rate - 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.

**Gas Flow Rate - AGA NB-13**

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

**Gas Flow Rate - Panhandle A**

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

**Gas Flow Rate - Panhandle B**

**Gas Flow Rate - IGT**

The IGT equation proposed by the Institute of Gas Technology is also known as the IGT distribution equation.