The Complete Guide to Liquid Nitrogen Dewars

Liquid nitrogen dewars are essential containers used for the safe storage and transport of liquid nitrogen (LN2), a cryogenic liquid with a boiling point of -196°C. These specialized vessels play a crucial role in various industries, including healthcare, research, manufacturing, and food preservation.

What is a Liquid Nitrogen Dewar?

A liquid nitrogen dewar is a double-walled, vacuum-insulated container designed to maintain extremely low temperatures. Unlike standard tanks, dewars are optimized to reduce evaporation and allow for safe handling of volatile cryogenic substances.

Common Types of Dewars

Storage Dewars: Primarily used to store liquid nitrogen for extended periods.
Transport Dewars: Designed for mobility and transferring LN2 between locations.
Self-pressurizing Dewars: Equipped with built-in pressure mechanisms for automatic LN2 dispensing.
Biological Sample Dewars: Used in laboratories and medical fields to store cells, tissues, or vaccines.

Applications Across Industries

Liquid nitrogen dewars are indispensable in a wide range of sectors:

Healthcare: Cryopreservation of biological materials and medical instruments sterilization.
Scientific Research: Maintaining cold conditions for chemical reactions and sample storage.
Food Industry: Flash freezing of food products and transportation of frozen goods.
Manufacturing: Shrink fitting and cryogenic grinding processes.

Safe Handling and Maintenance

Due to the extreme cold, handling LN2 dewars requires caution and proper training. Here are some essential safety tips:

Always wear protective gloves and face shields when handling.
Ensure proper ventilation in storage areas to avoid nitrogen build-up.
Regularly check for vacuum seal integrity and container damage.
Never seal dewars tightly; pressure build-up can be dangerous.

Choosing the Right Dewar

Selecting the appropriate dewar depends on several factors:

Storage duration and LN2 capacity requirements.
Mobility and transport needs.
Material compatibility and insulation efficiency.
Required dispensing methods (manual, pressure-fed, etc.).

Conclusion

Liquid nitrogen dewars are vital tools for managing cryogenic liquids safely and efficiently. By understanding their types, uses, and safety protocols, industries can maximize productivity while ensuring protection for personnel and materials. Whether for a laboratory, hospital, or industrial plant, choosing the right dewar is key to unlocking the full potential of liquid nitrogen applications.

The company's self-developed LNG Skid (model: SL-DQ) integrates LNG pumps, pipelines, instruments, valves, vaporizers, and other components into a single skid-mounted structure. The LNG pumps used are cryogenic submersible pumps, while the main pipelines, pump sump, and valves are constructed from stainless steel vacuum-jacketed tubing to ensure optimal thermal performance. This LNG skid supports multiple functions including tank filling, unloading, and saturation adjustment.

For the Safe Transport of Biological Samples in Vapor Phase. SERLNG's Vapor Shippers provide peace of mind when you transport your valuable samples.

The Liquid Helium Dura Cylinder is a high-performance, vacuum-insulated container engineered for the secure and efficient storage and transportation of liquid helium. It is specifically designed to achieve an ultra-low evaporation rate, ensuring extended holding times—a critical factor for minimizing the high cost of helium loss. Constructed from durable stainless steel with an advanced multilayer insulation system, it guarantees superior thermal performance. A key application includes reliably supplying coolant to MRI and NMR spectrometers in medical and research facilities, in addition to supporting various low-temperature physics experiments. Its robust design often incorporates safety features like pressure relief valves and a stable base for secure handling.

CNG Dispenser is a critical piece of equipment in compressed natural gas (CNG) refueling stations. It is specifically designed to safely, accurately, and efficiently transfer natural gas from storage to vehicles. Its key advantages include fast-filling capabilities for minimal vehicle downtime, high-precision metering for fair billing, and robust safety features that ensure reliable operation.

Dewars are designed for store and transport liquid oxygen, liquid nitrogen, liquid argon and liquefied natural gas. The gas cylinder is designed as a double-layer (vacuum) structure. The inner box is used to store cryogenic liquids.

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The micro cryogenic liquid storage tank is an innovative storage platform, which is designed to provide a more economical and convenient distribution and use for industry, laboratory, medicine and other fields.

Stainless steel liquid nitrogen bio-container is a large caliber liquid nitrogen container made of austenitic stainless steel. We offer both vapor-phase LN2 and full liquid LN2 bio-containers.