Liquid Nitrogen Storage — LN2 Cryogenic Tank Selection

Storing Liquid Nitrogen? Start Here

Liquid nitrogen (LN₂) is a powerhouse in industries ranging from food processing to medical research. It's incredibly cold, with a boiling point of -196°C (-320°F), and expands massively when it turns to gas. This means it can displace breathable air if it leaks. To store it safely, you need specialized cryogenic tanks, not regular plastic or steel tanks. These tanks are designed to handle the extreme cold and prevent the nitrogen from boiling off too quickly.

Can you store it in a poly tank?

No, you cannot store liquid nitrogen in a polyethylene tank. Polyethylene and other plastics become brittle and shatter at cryogenic temperatures. Use vacuum-jacketed cryogenic vessels made from materials like stainless steel or aluminum that can withstand the cold.

Key Issue: Expansion and Air Displacement

When liquid nitrogen vaporizes, it expands dramatically, about 696 times its liquid volume. This can displace oxygen in an enclosed space, creating a suffocation hazard. Proper ventilation and monitoring are crucial in areas where LN₂ is used or stored.

The safety that actually matters

• Always use cryogenic-rated tanks and equipment.
• Ensure proper ventilation to prevent oxygen displacement.
• Wear protective gear to avoid frostbite from contact.

Common questions

Can I use a regular steel tank for liquid nitrogen?

No, regular steel tanks are not suitable. Use cryogenic-rated vessels only.

What happens if liquid nitrogen spills?

It rapidly turns to gas, expanding and potentially displacing oxygen. Ensure good ventilation.

How do I transport liquid nitrogen safely?

Use specialized cryogenic containers designed for transport, like dewars or microbulk tanks.