Natural Gas Pipe Sizing Chart: Selected Pressures Above 5 PSI

Safety note: gas piping is not a guesswork project. This chart is for planning context only. Final natural gas pipe sizing must follow local code, the appliance manual, supply pressure, allowable pressure drop, regulator requirements, and inspection rules. Use a licensed gas fitter or qualified professional for real installations.

How To Read This Gas Pipe Capacity Chart

These are selected rows from a capacity chart for natural gas piping at pressures above 5 psig. The source table is based on 100 feet of Schedule 40 steel pipe and applies a fittings factor of 1.2, equivalent to adding 20% to pipe length. Upstream and downstream values are gauge pressure in psig. Capacity values are MBH (thousands of Btu per hour); they are approximately CFH only when the gas heating value is about 1,000 Btu per cubic foot.

Selected Natural Gas Pipe Capacities

[gs_table id=”9437″]

Use this reference only when its assumptions match the system being evaluated. Actual capacity depends on gas properties, pipe length and material, fittings, regulators, appliance requirements, and local code. A qualified gas fitter must determine the final pipe size.

Gas Pipe Sizing Checklist

• Confirm the appliance input rating and required inlet pressure.
• Account for actual pipe length and equivalent length through fittings.
• Confirm the regulator arrangement and allowable pressure drop.
• Use a chart or calculation method permitted by local code for the gas and pipe material.
• Have the installation pressure-tested and inspected as required locally.
• Do not use this online reference as a final design or permit document.

Source

Capacity values and chart assumptions are from Engineering ToolBox natural gas pipe sizing. Local code and qualified professional judgment control actual installations.