Nitrogen grades and purity
Nitrogen (N₂) is chemically inert at ordinary temperatures, which is exactly why industry uses so much of it — to displace oxygen, to blanket anything that must not oxidise, and to carry heat away without reacting with what it touches.
IIGAS supplies nitrogen against IS 1947 for industrial grade, with higher-purity grades available where the process demands it. Purity is documented on despatch, not assumed.
| Grade | Typical purity | Where it is used |
|---|---|---|
| Industrial nitrogen | 99.5%+ | Purging, pressure testing, general blanketing, pneumatic actuation |
| High-purity nitrogen | 99.9% – 99.99% | Heat treatment, bright annealing, electronics assembly, laser cutting |
| Ultra-high-purity nitrogen | 99.999% | Analytical instruments, carrier gas for GC, semiconductor and research use |
| Food-grade nitrogen | To food-contact requirement | Modified-atmosphere packaging, beverage blanketing, coffee and snack packing |
If you are unsure which grade your process actually needs, tell us the application rather than a purity figure — over-specifying purity is one of the most common ways a gas budget is wasted.
What industry uses nitrogen for
- ✓Purging and inerting vessels, pipelines and reactors before maintenance or start-up
- ✓Blanketing flammable liquids, resins and edible oils to keep oxygen out
- ✓Assist gas for laser cutting stainless steel and aluminium — nitrogen gives an oxide-free cut edge
- ✓Bright annealing and controlled-atmosphere heat treatment
- ✓Modified-atmosphere packaging (MAP) and beverage blanketing at food-grade quality
- ✓Pressure testing and leak testing where an inert medium is required
- ✓Tyre inflation, pneumatic actuation and instrument gas where dry inert gas is specified
- ✓Purge gas for acetylene and other flammable-gas plants — where air must never be used
How nitrogen is supplied
| Packaging | Typical content | Suits |
|---|---|---|
| 47 L high-pressure cylinder | ~6 m³ at 150 kg/cm² | Workshops, labs, intermittent purging, small-batch use |
| Cylinder bank / quad (6, 12 or 16 cylinders) | Multiples of cylinder content | Continuous draw, laser cutting, packaging lines |
| Manifolded bank with changeover panel | Continuous | Processes that cannot tolerate an interruption in supply |
| On-site PSA nitrogen plant | Continuous, generated on site | High steady consumption where cylinder logistics have become the bottleneck |
When a customer is taking more than a bank a week, on-site generation usually costs less per cubic metre than delivered cylinders. We will say so if that is what your figures show — including when it means selling you a plant instead of gas.
Cylinder identification and safety
Under IS 4379, an industrial nitrogen cylinder is French grey with a black neck band, and is marked with the gas name and formula. Getting this right matters on a mixed site — grey with no band is compressed air, not nitrogen.
The serious hazard with nitrogen is not fire or toxicity but asphyxiation. Nitrogen is odourless and colourless, it displaces oxygen without any warning to the person breathing it, and it is heavier work to detect than most people expect. Confined spaces that have been nitrogen-purged must be gas-tested and certified before entry — never entered on the assumption that the purge has cleared.
- ✓Store and transport cylinders upright, secured, with valve caps fitted
- ✓Ventilate any area where nitrogen is used in quantity; monitor oxygen in confined or low-lying spaces
- ✓Never enter a purged vessel without a valid gas test and entry permit
- ✓Use only regulators and hoses rated for the service pressure; never adapt fittings between gases
- ✓Keep cylinders away from heat and out of direct sun
Why buy nitrogen from IIGAS
IIGAS has manufactured and supplied industrial gases since 1947, and we sit on the Bureau of Indian Standards committees CHD 6 (Industrial Gases) and MED 16 (Gas Cylinders) — we manufacture to the standards those committees write.
We also build gas plants, which changes the conversation. If cylinders are the right answer we supply cylinders; if your consumption says you should be generating nitrogen on site, we will build you the plant and tell you what it will actually cost to run.
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