Content1. What is liquid nitrogen tank?
1.1 What is liquid nitrogen?
1.2 What is dewars tank?2. Types of liquid nitrogen tank
2.1 Liquid nitrogen transport dewar
2.2 Liquid nitrogen storage dewar
2.3 Pressurized liquid nitrogen dewar
2.4 Liquid nitrogen tank with glass liner
2.5 Portable liquid nitrogen tank3. Use of liquid nitrogen tank4. Features of liquid nitrogen tank5. Liquid nitrogen tank sizes6. How to buy liquid nitrogen tank?
What is liquid nitrogen tank?
A dewar canister that can store and transport liquid nitrogen is called liquid nitrogen tank, or liquid nitrogen flask.
What is liquid nitrogen?
is a binary compound formed by nitrogen with an element less electronegative than it. Liquid nitrogen
refers to nitrogen in the form of liquid. Liquid nitrogen is an inert, odorless, colorless, non-flammable, non-corrosive, and extremely low-temperature liquid. Most of the gas in the atmosphere is nitrogen - 78.03% in volume and 75.5% in weight. At normal temperatures and pressures, the boiling point of nitrogen is -196.56°C. One cubic meter of liquid nitrogen can be expanded to 696 cubic meters of pure gaseous nitrogen (21°C). If pressurized, liquid nitrogen can be obtained at much higher temperatures.
Industrially, liquid nitrogen is obtained by fractional distillation of air. The air is purified, liquefied under pressure and cooling, then separated by the different boiling points of the components in the air. Direct contact with liquid nitrogen is not a problem for an instant, but it does frostbite skin if touched for more than 2 seconds and is irreversible.
What is dewars tank?
, also known as thermos flasks, are an ideal container and tool for storing liquid gases, cryogenic research, and crystal component protection.
In ancient Rome, people already knew that double containers could keep war. In the ruins of Pompeii, people had dug up a double container.
The modern dewar container
was invented by Scottish physicist and chemist Sir James Dewar in 1892. Dewar instructed Berg to blow glass into a special glass bottle. It was a double-glass container in which both glass gall walls were coated with silver, and then the air between the two walls was drawn off to create a vacuum. The two layers of silver on the walls of the gall can prevent radiation heat dissipation and the vacuum can prevent convection and conduction heat dissipation, thus the liquid held in the bottle is less susceptible to temperature changes. Later, Berg used nickel to manufacture a shell to protect the fragile glass bottle gall. At that time, the storage dewar
was only used in laboratories, hospitals, and expeditions, but later it was promoted to use in daily life for picnics or journeys.
On January 20, 1893, Dewar announced an invention of the cryogenic dewar
, also called cryo dewar
. This container was later developed into a kind of daily necessity – a hot water bottle. In 1925, cheap plastic hot water bottles began to be sold to the general public.
At the same time, similar vacuum-insulated containers were needed for shipping and storing liquid gases in the laboratory. In 1906, Dewar invented the metal lab dewars
for storing liquid oxygen – that is Airgas dewar
. The liquid nitrogen tank, oxygen dewar
and CO2 dewar tank
, is a kind of liquid nitrogen dewar Airgas
Types of liquid nitrogen tank
The invention of the liquid nitrogen tank has scientifically solved the problems of large evaporation loss of liquid nitrogen caused by heat convection, conduction, and radiation of the container during storage. The dewar tanks for liquid nitrogen are widely used in animal husbandry, scientific research, machining, and other fields. Using liquid nitrogen as a refrigerant, nitrogen dewar is used to preserve animal semen, organs, strains, and other biological samples, as well as deep cooling treatment of metal materials and deep cooling assembly of precision parts.
According to different definition criteria, liquid nitrogen tanks can be divided into the following types.
Liquid nitrogen transport dewar
The liquid nitrogen transport dewar has a special design for collision avoidance. Except for being used for static storage, it can also be used for transportation when filled with liquid nitrogen. When using, violent collisions and vibrations should be avoided.
Liquid nitrogen storage dewar
Liquid nitrogen storage dewars are mainly used for indoor static storage of liquid nitrogen and preservation of experimental specimens. Because the liquid nitrogen tank has good low-temperature adiabatic properties and good anti-volatility of liquid nitrogen, it belongs to cryogenic storage dewar. Due to these characteristics, there is also a kind of dewars called liquid nitrogen tanks for cell storage, liquid nitrogen dewar for cell storage, or liquid nitrogen dewar cell storage.
Pressurized liquid nitrogen dewar
The working principle of pressurized liquid nitrogen dewar: the vessel is equipped with a self-pressurizing device inside, which uses a small amount of liquid nitrogen vaporization to generate pressure to discharge liquid nitrogen. It needs to be used in connection with other instruments for cooling.
Liquid nitrogen tank with glass liner
The glass-lined liquid nitrogen tank is environmentally friendly, hygienic, and easy to clean. It is an ideal container for storing liquid gas.
Portable liquid nitrogen tank
Portable liquid nitrogen tanks are mainly used for small volume sample preservation. It is economical, small and light, easy to carry, and low consumption.
Use of liquid nitrogen tank
a. Before using the liquid nitrogen tank
Before filling the liquid nitrogen, you should check whether the shell is dented and the vacuum exhaust port is intact or not. If they are damaged, the vacuum degree will be reduced. In serious cases, the inlet air cannot be insulated, resulting in the upper part of the tank will be a frost, liquid nitrogen loss, and lose the value of continued use. Then, check the interior of the tank. If there is another thing, it must be removed to prevent the inner liner from being corroded.
b. Liquid Nitrogen Filling
You should keep careful when filling the liquid nitrogen tank. For new tanks or tanks in dry condition, you should make sure to pre-cool and fill slowly to prevent the inner liner from being damaged by cooling too fast and reducing the service life. When filling liquid nitrogen, do not pour liquid nitrogen on the vacuum venting port to avoid loss of the vacuum level. The cover plug is made of adiabatic material, which can prevent the evaporation of liquid nitrogen and also play the role of fixing the lifting cylinder, so the switch should minimize the wear and tear to prolong the service life.
c. Storage of liquid nitrogen in liquid nitrogen tanks
When storing the liquid in liquid nitrogen tanks, please be sure to close the inlet/discharge valve and booster valve, and the venting valve must be opened.
d. Transportation of liquid nitrogen in liquid nitrogen tanks
When transporting liquid nitrogen in liquid nitrogen tanks, the opening and closing status of each valve should be the same as that of the storage. The base of the packing box should be padded under the container seat circle, and the nitrogen dewar tank should be fixed reliably on the car with ropes so that the dewar container for liquid nitrogen will not shake during the transportation.
e. Infusion of liquid nitrogen in liquid nitrogen tanks.
If you want to output liquid nitrogen from the liquid nitrogen tank, please operate according to the following procedures:
a) close the venting valve
b) open the booster valve
c) observe the pressure gauge
d) when the pressure rises to 0.05MPa (0.5kg/cm2), open the drain valve, then you can continuously infuse the liquid.
f. In-use inspection
When using a liquid nitrogen tank, it should be checked frequently. You can observe it with your eyes or touch the shell with your hands. If it is frozen outside, you should stop using it. If it is frozen inside, it is not advisable to scrape it with a knife to prevent the inner wall of the neck tube from being damaged or causing a bad vacuum. It is suggested to let out the liquid nitrogen and let it melt naturally.
Malfunction of liquid nitrogen tank may cause frostbite or asphyxiation, it is very necessary to check frequently in use.
Features of liquid nitrogen tank
a. Liquid nitrogen tanks provide a quality option for users who need long-term indoor storage of biological samples or liquid nitrogen under static conditions.
b. Advantages of low daily evaporation and long shelf life.
c. Liquid nitrogen tanks are generally made of high-strength aluminum alloy (aluminum dewars), with light quality.
d. The design of high vacuum, multi-layer insulation.
e. Easy-to-carry, flexible rotating hinged carry handle.
f. With locking lid to protect samples stored inside.
g. With a protective sleeve to prevent bumping and bruising in the use of the product.
Liquid nitrogen tank sizes
Since liquid nitrogen tanks are used in different kinds of industries, there are different classifications for them. In general, they can be broadly divided into large liquid nitrogen tanks and small liquid nitrogen tanks. For a more detailed classification, please see the following table:
|Volume||Liquid nitrogen storage dewar||2L, 3L, 5L, 6L, 10L, 15L, 20L, 30L, 35L
|Liquid nitrogen transport dewar||10L,15L, 30L, 35L, 50L, 100L
|Pressurized liquid nitrogen dewar||50L, 100L, 175L, 200L, 300L, 500L
|Caliber||35mm, 50mm, 80mm, 125mm, 500mm
5l liquid nitrogen dewar, 25l liquid nitrogen dewar, and 50l liquid nitrogen dewar are usually used in laboratories.
180-liter liquid nitrogen dewar, 200-liter liquid nitrogen tank, and 230-liter liquid nitrogen tank are usually used in other industries.
How to buy liquid nitrogen tank?
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