Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

# Natural Gas - Pipe Sizing Calculator

## Calculate capacities and dimensions of natural gas pipe lines.

The capacity of a low pressure natural gas (less than 1 psi, 6.9 kPa) pipe line with a small pressure loss can be calculated with the Spitzglass formula

q = 3550 k ( h / (l SG))1/2         (1)

where

q = natural gas volume flow (cfh)

h = pressure drop (in Water Column)

l = length of pipe (ft)

k = [d5 / (1 + 3.6 / d + 0.03 d)]1/2

d = inside diameter pipe (in)

SG = specific gravity of natural gas

For natural gas the nominal BTU/cf varies from about 900 to 1100 BTU/cf. In general it is common to set

• 1 Cubic Foot (CF) = approx 1000 BTUs
• 1 CFH = 1 MBH

The specific gravity of natural gas varies from 0.55 to 1.0. Typical values are in the range 0.6 - 0.7.

The downstream pressure in a houseline after the meter/regulator is in general in the range of 7 to 11 inches Water Column, or about 1/4 psi.

### Example - Natural Gas Pipe Capacity

The capacity of a 100 ft natural gas pipe with a nominal diameter 0.5 inches (actual ID 0.622 in) and 0.5 inches WC pressure drop can be calculated as

k = [((0.622 in))5/(1 + 3.6 / (0.622 in) + 0.03 (0.622 in))]1/2

= 0.117

q = 3550 0.117 ((0.5 in) / ((100 ft) 0.60) )1/2

= 37.9 (cfh)

Specific gravity of natural gas is set to 0.60.

### Related Mobile Apps from The Engineering ToolBox

- free apps for offline use on mobile devices.

## Related Topics

• ### Gases and Compressed Air

Properties of air, LNG, LPG and other common gases. Pipeline capacities and sizing of relief valves.

## Related Documents

• ### Density vs. Specific Weight and Specific Gravity

An introduction to density, specific weight and specific gravity.
• ### Gas Pipes - Approved Materials

Materials approved for gas pipes.
• ### Gas Pipes - Low Pressure Sizing

Sizing gas pipes for apartment service lines.
• ### House Gas Pipes - Capacities vs. Dimensions

Carrying capacity of house gas pipes - in imperial and metric units.
• ### Natural Gas - Meter Capacities

Types of natural gas meters and their capacities.
• ### Natural Gas Apartment Consumption vs. no. of Apartments

Multiple apartments and natural gas demand.
• ### Natural Gas Laboratory Consumption vs. no. of Outlets

Natural gas consumption in laboratory outlets.
• ### Natural Gas Pipes - Low Pressure Capacities vs. Size

Sizing low pressure natural gas pipe lines - Imperial units.
• ### Natural Gas Piping - Sizing of Low Pressure Pipes vs. Capacity

Sizing low pressure natural gas pipe lines - Metric units.
• ### Orifices - Natural Gas Capacity

Capacity of natural gas orifices.
• ### Pipes - Relative Capacity

Relative capacity between larger and smaller pipes.

## Search

Search is the most efficient way to navigate the Engineering ToolBox.

## Engineering ToolBox - SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

About the Engineering ToolBox!

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

## Citation

• The Engineering ToolBox (2008). Natural Gas - Pipe Sizing Calculator. [online] Available at: https://www.engineeringtoolbox.com/natural-gas-pipe-calculator-d_1042.html [Accessed Day Month Year].

Modify the access date according your visit.

8.21.8

.