Pipeline Engineering

Steel Pipe Dimensions

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

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

PE Pipe Dimensions

Pipe Dimension Standard

Pipe Nominal Size (IPS)

Dimension Ratio (DR)

Gas Data

Gas Temperature at Base Condition, Tb

°F

Gas Pressure at Base Condition, Pb

psig

Gas Flow Rate at Base Condition

ft³/day

Gas Specific Gravity, G

Gas Viscosity

Friction Factor

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.

Pipeline Efficiency, E

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

Pipe Interior	Total Degrees of All Bends in Pipe Section
Pipe Interior	5° to 10°	60° to 80°	200° to 300°
Bare Steel	0.975 - 0.973	0.960 - 0.956	0.930 - 0.900
Plastic Lined	0.979 - 0.976	0.964 - 0.960	0.936 - 0.910
Pig Burnished	0.982 - 0.980	0.968 - 0.965	0.944 - 0.920
Sand Blasted	0.985 - 0.983	0.976 - 0.970	0.951 - 0.930
Note: Values above are based on 40-ft joints of pipelines and mainline valves at 10-mile spacing.

PipeEng

Natural Gas Pipeline - Friction Factor

	Friction Factor - Colebrook	0.2534
	Friction Factor - Modified Colebrook	0.2535
	Friction Factor - AGA NB-13	0.2536
	Friction Factor - Weymouth	0.2536
	Friction Factor - Panhandle A	0.2536
	Friction Factor - Panhandle B	0.2536