Dewar cylinders are vacuum-insulated vessels used to store and supply liquefied gases such as nitrogen (LN2), oxygen, argon, and CO2. They are designed for applications requiring stable low-temperature storage and a reliable gas supply.
Compared with high-pressure cylinders, dewar cylinders store gas in liquid form, offering higher capacity, fewer refills, and improved efficiency. They are widely used in industrial production, laboratories, healthcare, and food processing.
What is a Dewar Cylinder?
A dewar cylinder (cryogenic liquid cylinder) is a double-wall insulated tank designed to keep gases in liquid form at extremely low temperatures.
- Inner vessel – stores the cryogenic liquid
- Outer shell – provides structural protection
- Vacuum insulation – reduces heat transfer
Each unit includes pressure-building systems, safety valves, and gas/liquid outlets, allowing direct gas supply without additional equipment.
Types of Dewar Cylinders
- LN2 Dewars – for liquid nitrogen storage, cooling, and freezing
- CO2 Dewars – for beverage, welding, and fire systems
- Oxygen Dewars – for medical and industrial oxygen supply
- Argon Dewars – for welding and metal fabrication
- Portable Dewars – small, easy to move units
- Stationary Cylinders – larger units for continuous supply
Applications
- Welding and metal fabrication (argon and CO2)
- Medical oxygen supply (hospitals and clinics)
- Food industry (LN2 freezing and CO2 carbonation)
- Laboratories (sample storage and research)
- Electronics manufacturing (high-purity gases)
- Industrial processes (cooling and inerting)
Advantages
- Higher capacity – liquid storage holds more gas
- Lower cost – fewer refills required
- Stable supply – built-in gas delivery system
- Energy efficient – vacuum insulation reduces loss
- Multi-gas use – LN2, oxygen, argon, CO2 compatible
- Flexible sizes – multiple liquid nitrogen dewar sizes
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