Industrial nitrogen
What Is Nitrogen Used For?
Nitrogen is used wherever a process needs an inert, dry, oxygen-free atmosphere: blanketing tanks, packaging food, cutting metal, treating heat, soldering electronics, and purging pipelines. Most of these industrial uses run on high-purity nitrogen produced on site from compressed air.
78%
Of air is nitrogen
Inert & dry
Why industry uses it
99.9995%
Purity available
On site
Continuous supply
Nitrogen is the workhorse gas of industry
So what is nitrogen used for? In short, it is used to keep oxygen and moisture away from things that react with them. Nitrogen is chemically inert at normal temperatures, it is dry, and it makes up 78% of the air around us, so it is both effective and inexpensive to produce. Those three traits explain nearly every one of the industrial uses of nitrogen below.
The common uses of nitrogen fall into a few patterns: displacing oxygen above a stored liquid (blanketing), flushing oxygen out of a package or vessel (purging), shielding hot metal from the air (heat treating, soldering, brazing), and providing a clean assist or carrier gas (laser cutting, lab instruments). Each one trades a reactive air atmosphere for a stable nitrogen one.
The other thing these uses of nitrogen gas have in common is volume. A plant that blankets tanks or runs a packaging line needs nitrogen continuously, which is why so many operations generate it on site from compressed air instead of paying for repeated bulk or cylinder deliveries. The sections below cover the main applications and link to how each one is supplied.
The main industrial uses of nitrogen gas
Nine of the most common applications, and where on-site nitrogen supplies each one.
Tank blanketing & inerting
Nitrogen fills the space above a stored liquid to push out oxygen and moisture, stopping oxidation and lowering fire risk in tanks and reactors. Typical purity is 95% to 99%.
Nitrogen blanketing ›Food & beverage packaging
In modified atmosphere packaging, nitrogen replaces the oxygen inside a package to slow spoilage and extend shelf life. Food-grade applications run up to 99.9% purity.
Food packaging (MAP) ›Laser cutting
As an assist gas, high-purity nitrogen blows molten metal out of the cut and keeps oxygen off the edge, leaving a clean, oxide-free finish on fiber and CO2 lasers.
Laser cutting nitrogen ›Heat treating & annealing
A nitrogen furnace atmosphere shields metal parts from air during annealing and hardening, preventing scaling and decarburization on the finished surface.
Heat treating nitrogen ›Electronics & soldering
Nitrogen creates an inert atmosphere in reflow, wave, and selective soldering, reducing oxidation for cleaner joints and fewer defects. Purity runs 99.9% to 99.999%.
Soldering nitrogen ›Pharmaceutical & biotech
Nitrogen blankets reactors, purges vessels, and protects packaged product. A built-in oxygen analyzer lets manufacturers document the high purity their processes require.
Pharmaceutical nitrogen ›Labs & analytical instruments
LC-MS, GC, and sample prep depend on a steady supply of clean nitrogen for carrier, curtain, and source gas. On-site generation replaces cylinder swaps.
Laboratory nitrogen ›Oil, gas & pipelines
Nitrogen purges pipelines and vessels of flammable gas before maintenance and pressurizes lines for testing, removing the explosion risk that oxygen would carry.
Oil & gas nitrogen ›Fire protection sprinklers
In dry-pipe and pre-action sprinkler systems, nitrogen replaces the oxygen and moisture that corrode the piping from the inside, extending the life of the system.
Fire protection nitrogen ›Why nitrogen, and not just air?
Three properties make nitrogen the default gas for protecting processes from oxygen and moisture.
Property 01
It is inert
At normal process temperatures nitrogen does not react with most materials, so it can sit in contact with fuels, foods, metals, and chemicals without changing them. Air cannot do this because its 21% oxygen drives oxidation, corrosion, and combustion. Swapping air for nitrogen removes that reactive oxygen.
Property 02
It is dry
Generated nitrogen carries almost no water vapor, with a dew point well below freezing. That matters for electronics, fire-sprinkler piping, and powder handling, where moisture causes corrosion, clumping, or solder defects. A dry blanket of nitrogen keeps both oxygen and humidity off the product.
Property 03
It is abundant
Because nitrogen is 78% of the air, a generator can separate it from compressed air on site for a small fraction of the cost of delivered gas. That low running cost, up to 90% below bulk or cylinder supply, is what makes high-volume uses like blanketing and packaging practical to run continuously.
Frequently asked questions
What is nitrogen used for?
Nitrogen is used to create an inert, oxygen-free, low-moisture atmosphere wherever oxygen would cause a problem. The main industrial uses are tank blanketing and inerting, modified atmosphere food packaging, laser cutting assist gas, heat treating and annealing, electronics soldering, pharmaceutical processing, laboratory instruments, oil and gas purging, and fire-sprinkler corrosion control. In every case nitrogen displaces the oxygen and moisture in normal air.
What is nitrogen gas used for in manufacturing?
In manufacturing, nitrogen gas is used to protect products and processes from oxidation. It shields hot metal during heat treating, brazing, and soldering, blankets chemical reactors and storage tanks, packages food and pharmaceuticals to extend shelf life, and serves as the assist gas that gives laser-cut metal a clean edge. These are the most common uses of nitrogen gas on a plant floor.
Why is nitrogen used instead of regular air?
Regular air is about 21% oxygen, and oxygen drives oxidation, corrosion, spoilage, and combustion. Nitrogen is inert at process temperatures and is dry, so replacing air with nitrogen removes the reactive oxygen and the moisture in one step. That is why nitrogen, not compressed air, is used for blanketing, packaging, and metal processing.
What are the most common uses of nitrogen?
The most common uses of nitrogen are blanketing and inerting (displacing oxygen above stored liquids), purging (flushing oxygen or flammable gas out of vessels and pipelines), modified atmosphere packaging for food and beverages, and shielding atmospheres for heat treating, soldering, and laser cutting. Labs and pharmaceutical plants also use large volumes for analytical instruments and product protection.
What is nitrogen used for in food?
In food, nitrogen is used for modified atmosphere packaging. The oxygen inside a bag or container is replaced with nitrogen, which slows the oxidation and microbial growth that cause spoilage, so the product stays fresh longer. Nitrogen also cushions delicate products like snack foods. Food-grade applications typically run up to 99.9% purity.
What purity of nitrogen do different uses need?
Purity is matched to the application. Blanketing and inerting usually run 95% to 99%. Food packaging runs up to 99.9%. Laser cutting, electronics soldering, pharmaceutical, and laboratory work need high-purity nitrogen, from 99.9% up to 99.9995%. On-site generators let you dial in the exact purity each use requires rather than paying for more than you need.
Is nitrogen used to inflate tires?
Yes. Nitrogen is used to fill tires because it holds pressure more steadily than air and carries no moisture to corrode the wheel. This is a real use of nitrogen, though it is a consumer and fleet application rather than the industrial blanketing, packaging, and metal-processing work that on-site nitrogen generators are usually sized for.
Where does industrial nitrogen come from?
Industrial nitrogen is separated from ordinary air, which is 78% nitrogen. It can be delivered as bulk liquid or cylinders, or produced on site with a nitrogen generator that uses pressure swing adsorption or membrane separation to pull nitrogen out of compressed air. On-site generation removes delivery costs and supply interruptions and typically pays for itself in 12 to 14 months.