Why is Nitrogen Purging Important?
Nitrogen purging is essential to remove oxygen, moisture, or flammable gases from systems before maintenance, startup, shutdown, or introducing a new process fluid. It prevents fires, explosions, and contamination—protecting both people and equipment.
When Do We Use It?
Before starting up or shutting down process units
Prior to maintenance on tanks, vessels, or pipelines
When switching between reactive or flammable fluids
To prevent oxidation or corrosion in sensitive systems
How Is It Done?
✅ There are several common methods:
Displacement Purging: Nitrogen pushes out unwanted gases in pipelines
Dilution Purging: Nitrogen mixes with gases inside tanks or vessels
Pressure Cycling: Alternate pressurizing and venting with nitrogen to reduce oxygen levels
What Are the Dangers? ⚠️
While nitrogen is inert, it can be deadly in confined spaces:
Asphyxiation risk due to oxygen displacement
Over-pressurization hazards if not controlled properly
Cold burns from liquid nitrogen
That’s why safety measures like oxygen monitoring, ventilation, and confined space entry protocols are critical.
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