20l liquid nitrogen container

Types of 20l liquid nitrogen containers

The 20l liquid nitrogen container is a cryogenic storage vessel used for preserving biological samples, like human eggs, sperm, embryos, stem cells, and other perishable goods at extremely low temperatures. Its design is based on the concept of vacuum flasks or Dewar flasks, where two walls create a space with no air or very low pressure between them, and they are available in two main categories: static containers and portable containers.

• Static containers

Static 20-liter liquid nitrogen containers provide cryogenic temperatures over extended periods. Their high-vacuum insulation prevents heat transfer, maintaining subzero temps for weeks. Key points include:

1. Very low evaporation rate

   Static nitrogen dewers have a low evaporation rate, letting the gas condense and cool the inside without continual refilling. They are ideal for long-term cryogenic storage but need periodic liquid nitrogen replenishment.

2. Surrogate reservoirs

   Many static containers also include a surrogate reservoir or a vacuum casing around the primary chamber, providing an extra layer of protection against temperature changes and ensuring a stable cryogenic environment for the specimens stored within.

3. High thermal insulation

   The double-wall construction creates a space with minimal air between the walls, which offers outstanding thermal insulation. This design significantly reduces heat transfer, allowing the container to maintain extremely low temperatures.

4. Super insulation technology

   Some dewars utilize super insulation techniques, which add even more thermal resistance. These may involve multiple thin layers or advanced materials, greatly enhancing the container's ability to retain cryogenic temperatures over long periods.

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• Portable containers

Portable liquid nitrogen containers come with wheels or handles for easier transport. They still have excellent thermal insulation to keep liquids cold for days. Their lightweight design, usually under 10 kg, makes them suitable for mobile applications where nitrogen needs to be taken to different locations.

Two main types of portable nitrogen dewars are cryo cylinders and cryo racks:

1. Portable cryogenic cylinders

   Portable cryo cylinders have an ultra-lightweight design and come with a carrying handle for ease of transport. These nitrogen storage containers are versatile and can be taken to the field wherever biological samples or perishable goods require cryogenic preservation. The affordability of portable cryogenic cylinders makes them an attractive solution that meets the low-budget needs of users who need to store biological samples in different locations.

2. Cryogenic rack containers

   The design of cryogenic rack containers is optimized to accommodate 20L liquid nitrogen dewars vertically, securely holding them in place during transportation. This design allows for easy and efficient transport of multiple dewars simultaneously. Additionally, cryogenic rack containers often come equipped with heavy-duty casters, providing smooth mobility and the ability to lock in place securely when not in use. The durable cassettes used in these racks can protect the dewar from damage, ensuring that the liquid nitrogen storage vessel remains intact and ready for use whenever needed.

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Specifications & Maintenance

20L Liquid Nitrogen Container specifications:

• Body TMaterial: The body material of a liquid nitrogen container is usually an alloy steel or aluminum, which has a good strength and a low thermal conductivity, ensuring good thermal insulation while withstanding high-pressure liquid nitrogen.
• Neck Diameter: The neck diameter of a liquid nitrogen container determines how easy it is to put things into it and take things out of it. A 20-liter size usually has a neck diameter of about 50 to 80 mm.
• Weight: 20L liquid nitrogen containers usually weigh between 15 and 25 kg. The exact weight depends on the design and materials of the container.
• Operating Pressure: The working pressure of a liquid nitrogen container is usually between 0.1 and 0.5 MPa. This means that it can keep liquid nitrogen in a gaseous state at low temperatures and high-pressure environments.
• Vacuum Degree (mmHg): The higher the vacuum value of a liquid nitrogen container, the better the thermal insulation effect. The vacuum degree of a liquid nitrogen container is usually more than 500 mmHg (about 666.7 torr).

The 20-liter liquid nitrogen container needs to be maintained and cared for like other liquid nitrogen containers so that it can work normally and have a longer service life.

• Clean: Regularly clean the outside and inside of the the part of the container that contacts liquid nitrogen. In cleaning, one should use clean water or neutral detergent, avoiding using strong or corrosive chemicals, and then thoroughly drying it.
• Inspect: Regularly inspect the nitrogen container for damage, such as deformation, cracks, or loose parts. Pay special attention to inspect the vacuum degree gauge and pressure relief valve to ensure they are working properly and are not blocked.
• Avoid Rapid Temperature Changes: Avoid exposing the liquid nitrogen container to rapid temperature changes, such as sudden heating or cooling, which could damage the inner container.
• Vacuum Preservation: Carefully preserve the vacuum of the liquid nitrogen container. If there is a damage to the vacuum, it will reduce the thermal insulation ability, so it needs to be repaired or replaced in time.

Uses of 20L Liquid Nitrogen Container

The 20L Liquid Nitrogen Container is useful in industries, hospitals, schools, and businesses.

• Medical and Healthcare Applications

  The 20L Liquid Nitrogen Container is useful for storing biological specimens like human tissues, blood, or DNA. It can also be used for preserving medical supplies like vaccines or medications that need to be kept at super cold temperatures. Liquid nitrogen is also used for the cryotherapy treatment of warts, moles, skin lesions, and other benign tumors. These containers can also be used to store reproductive cells like sperm, eggs, and embryos.

• Food Industry Applications

  In the food industry, a 20L Liquid Nitrogen Container can be used to store or flash freeze food products. Flash freezing preserves food's taste, texture, and nutritional value. The container can also be used for cryogenic grinding, where nitrogen freezes food at super cold temperatures before grinding them into a powder. Nitrogen is an inert gas that can be used in the food industry for封闭氧气, protecting the food from oxidization.

• Scientific Research and Development

  Liquid nitrogen is a vital component in many scientific research endeavors. 20L Liquid Nitrogen Containers are used to keep nitrogen coolers, cryo-coolers, and cryo-traps, all of which can be used in cryogenics. Cryogenics is the study of materials and elements at extremely low temperatures. The container is also used as a coolant for temperature-sensitive equipment and as a coolant during chemical reactions that require low temperatures.

• Industrial and Engineering Applications

  In the industrial world, a 20L Liquid Nitrogen Container is used for cryogenic treatment and preservation of metals. Liquid nitrogen has a wide application in engineering. It is used in the cryosurgery repair of solid-state electron devices, cooling of circuit boards, and the cryopreservation of specific electronic components. Liquid nitrogen is also used to shrink fit components, making assembling and disassembling machinery parts easier. It can also be used to freeze plastic during cutting, welding, and machining.

How to Choose 20l Liquid Nitrogen Container

When choosing a 20l liquid nitrogen container, the purpose for which the container will be used should be considered. In the medical field, where liquid nitrogen is used for cryopreservation, nitrogen containers with suction cups are preferred, as they monitor the temperature closely. However, for storing samples in extreme cold places, a container with a high evaporation rate is necessary.

The transfer of liquid nitrogen from one vessel to another is usually done by dipper siphons. When dipper siphons with a 20-liter liquid nitrogen container are preferred, look for ergonomic handles that ease the handling of the dipper and a top-mounted holder to secure the dipper in place when it is not in use.

Another factor to consider when purchasing a 20-liter liquid nitrogen container is the material used in the construction of the vessel. Stainless steel containers are often used in the biology/medical field, while aluminum containers are preferred in more extreme cold environments’ fields because of their lightweight nature and lower boiling point. Nitrogen containers with a low boiling point are better for the environment and have higher insulation.

When purchasing a 20-liter liquid nitrogen container, please pay attention to its protective features. If impact protection is desired, a container with an outer neck shield and collar that absorbs impact is necessary. Liquid nitrogen containers in the lab also have rubber base shields to prevent the container from sizzling and reduce the boil-off of liquid inside the container.

For easier transportation, a liquid nitrogen container with castors is desirable. Some containers have dual-castors that support heavy loads. An optional accessory available in non-castor nitrogen containers is a sturdy trolley.

Q & A

Q1: How long does a 20L liquid nitrogen container will hold liquid nitrogen?

A1: The 20L liquid nitrogen container can hold liquid nitrogen for approximately 8 to 10 months.

Q2: What are the 20L liquid nitrogen container replacement parts?

A2: Some of the replacement parts include the neck, lid, canister, collar, cup, and gasket.

Q3: How to maintain a 20L liquid nitrogen container?

A3: Clean the outside of the container with a damp cloth. Store the container inside a well-ventilated room. And, supply the container with the required amount of air to avoid an overfilling hazard.