Valves for Nitrogen (N₂) Service
Nitrogen is an inert utility gas used throughout industry for blanketing, purging, pressurisation, and inerting of vessels, pipelines, and tanks. Gaseous nitrogen (GAN) is non-corrosive and inert, making material selection straightforward, though high-pressure nitrogen service (200–350 barg) and cryogenic liquid nitrogen require special attention to pressure ratings and embrittlement.
Pressure Range
5–350 barg (atmospheric to high-pressure GAN)
Temperature
−196°C (LN₂) to +150°C (heated nitrogen)
Industries
Air separation units, Chemical plants, Food & beverage
Key Properties — Nitrogen (N₂)
- Chemically inert — non-corrosive to virtually all metals
- Gaseous at ambient conditions, cryogenic liquid at −196°C
- Widely used for blanketing, purging, and leak testing
- High-pressure GAN at 200–350 barg in CNG and ASU service
- Asphyxiation hazard in confined spaces — oxygen displacement
Material Compatibility — Nitrogen (N₂)
Ratings are indicative. Actual compatibility depends on concentration, temperature, velocity, and presence of contaminants. Always consult corrosion tables or a materials engineer.
| Material | Rating | Notes |
|---|---|---|
| Carbon Steel (WCB/A105) | Excellent | Excellent for ambient and elevated temperature nitrogen service. |
| SS 316L | Excellent | Excellent across all conditions including cryogenic liquid nitrogen. |
| A352 LCB/LCC | Excellent | Required for low-temperature nitrogen below −29°C. |
| Brass / Bronze | Good | Acceptable for instrument and utility nitrogen at moderate pressures. |
| PTFE | Excellent | Ideal for seals and lined valves in all nitrogen service. |
Recommended Valves
Ball Valve (floating or trunnion)
Fast isolation for blanketing and purge lines; fire-safe design for process areas
Needle Valve
Precise flow control for instrument lines and low-flow purge connections
Gate Valve
Full-bore isolation for large nitrogen headers and ASU distribution
Check Valve (piston type)
Prevention of backflow at nitrogen injection points and compressor outlets
Safety Relief Valve
Overpressure protection on nitrogen storage vessels and distribution headers
Valves to Avoid
Diaphragm valves for high-pressure nitrogen above 40 barg
Butterfly valves for precise flow control in critical purging
Special Considerations
Applicable Standards
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