Liquid Nitrogen Dewars

Liquid Nitrogen Dewars

DSW is a leading provider of high-performance cryogenic dewars, designed for the safe and efficient storage of liquefied gases like nitrogen, oxygen, argon, and carbon dioxide.

Reliability for Cryogenic Storage Needs

DSW dewars are built to the highest standards, ensuring optimal performance and user safety:
Durable Construction: We utilize high-strength stainless steel shells that are both durable and lightweight, offering long-lasting performance and easy handling.
Advanced Thermal Protection: DSW dewars incorporate superior insulation technology, minimizing heat transfer and maximizing the holding time of your cryogenic liquids.
DSW offers various sizes of liquid nitrogen dewars, all competitively priced and available for worldwide distribution.

Liquid Nitrogen Dewars

The solution to store and transport Nitrogen

The liquid nitrogen Dewars is based on a proven design and construction and offers a wide range of capacities for individual laboratory storage and liquid nitrogen handling requirements.
These Dewars combine strength, high thermal efficiency, and ease of handling.
DSW is a global supplier of high-quality liquid nitrogen dewars available in sizes ranging from a small 20-litre to a sizeable horizontal tank that holds 425 litres.

LN2 Dewar Sizes

welded Insulated cryogenic liquid container dewar cylinder

LN2 Storage Dewars

These portable dewars work equally well with liquified gas, liquid oxygen, liquid argon, and liquid nitrogen for low-pressure transport & storage.
These liquid nitrogen Dewars can fulfil many different applications. These are simple, efficient liquid nitrogen tanks that can also be used for liquid oxygen or argon.
Liquid Nitrogen Dewars

Liquid Nitrogen Dewars

What is a dewar?

A cryogenic storage dewar (named after James Dewar) is a specialised type of vacuum flask used for storing cryogens (such as liquid nitrogen or liquid helium) whose boiling points are much lower than room temperature.
Cryogenic dewars may take several forms, including open buckets, flasks with loose-fitting stoppers, and self-pressurising tanks. All dewars have walls constructed from two or more layers, with a high vacuum maintained between the layers.

Features

Purpose: Liquid nitrogen dewars safely store and transport cryogenic liquids.
Construction: They typically have a double-walled design with an inner container that holds the liquid and an outer shell for insulation.
Materials: Cryogenic storage Dewars can be made from aluminium, stainless steel, or glass.
Capacity: Dewars come in various sizes, from small ones (a few litres) to large tanks (hundreds of litres).
Insulation: The insulation minimizes heat transfer, allowing the stored liquid to remain at very low temperatures.
Applications: Researchers, laboratories, and medical facilities use dewars for cryopreservation, sample storage, and other low-temperature processes.
dewar-nitrogen-tank-450L-Liquid-Nitrogen-Containers

Application of LN2 Dewars

  • Saving Biological Samples: Scientists and doctors use LN2 dewars to preserve cells, tissues, and organs at super-cold temperatures. This helps keep these samples viable for research or medical treatments.
  • Storing Cold Stuff: Labs rely on cryo dewars to store materials that need to stay chilly, like high-tech gases and superconductors. These dewars provide a steady, freezing environment to keep sensitive materials safe.
  • Freezing Foods: In the food industry, LN2 dewars are handy for flash-freezing perishable items like fruits, veggies, and meats. Quick freezing with liquid nitrogen helps maintain food quality and freshness.
  • Making Chips: In the tech world, cryogenic storage dewars help keep things cool during the production of computer chips. They chill equipment and keep it working smoothly during manufacturing.
  • Medical Procedures: Doctors use LN2 dewars for cryosurgery, which frees and removes abnormal or diseased tissue. It’s a less invasive way to treat warts or precancerous lesions.
  • Cooling in Manufacturing: Metalworking industries use LN2 dewars for cryogenic machining, where super-cold nitrogen cools cutting tools and helps improve precision and efficiency.
  • Exploring Science: Liquid nitrogen dewars are essential tools in research labs studying everything from superconductivity to quantum mechanics. They create and maintain the low temperatures needed for these experiments.
  • Testing Toughness: Environmental testing chambers use LN2 dewars to subject materials to extreme temperature changes. This helps test how well electronics or aeroplane parts hold up in harsh conditions.

Liquid Nitrogen Dewars

The Inspection Guarantee of Liquid Nitrogen Dewars :

In the production of liquid nitrogen dewars, the following steps will be followed in a precise and sequential manner:
The relevant welding seams will undergo 100% RT non-destructive and penetrant testing (PT) per the technological requirements for dewar production.
Strength testing will use high-purity nitrogen (up to 99.999%).
We will perform helium mass spectrometer leak detection using advanced detectors with a precision of up to 2×10-9Pa.L/s.
The inner containers of the storage tanks will be passivated through overall pickling to meet the cleanliness requirements for dangerous goods.
Imported ultraviolet black light lamps will ensure the absence of oil stains and other organic impurities in the inner containers.
After cleaning, the assembly team will assemble the inner and outer containers within 2.5 hours.
Upon assembly, the team will fill nitrogen in the inner containers and interlayers to safeguard against dust and organic impurities, ensuring cleanliness.
The outer surfaces of the outer containers will undergo overall sandblasting treatment to meet the Sa-2.5 standard requirements.
When the steel plate surfaces exhibit a metallic colour, a vacuum cleaner will remove any adhered dust, ensuring a higher vacuum degree in the interlayer.
We will utilize special high-quality perlite as the insulation material in the interlayer, treating it using our company’s unique process before applying it.
All internal cylinders will undergo gas-tightness and pressure performance tests after manufacturing.
Rigorous Helium mass spectrum leak detection will be conducted on the internal and outer cylinders.
After production, all pipe openings will be purged and replaced with nitrogen to meet the oxygen usage standard.
Subsequently, all pipelines and valves will be sealed, and the tanks will be filled with 0.2MPa high-purity nitrogen to ensure their protection.

welded Insulated cryogenic liquid container dewar cylinder