Cryogenic preservation method for liquid helium

Liquid helium   Helium gas

1. Storage Temperature of Liquid Helium Liquid helium is an extremely low-temperature refrigerant medium that is in a gaseous state at room temperature and needs to be stored at extremely low temperatures. The storage temperature of liquid helium should generally be below 4.2K, and liquid nitrogen can be used for cooling or directly cooled by a refrigerator.

II. Liquid Helium Storage Containers Liquid helium needs to be stored in special containers, and commonly used liquid helium storage containers include steel and stainless steel tanks. After special treatment, steel tanks can withstand the low temperature and high pressure of liquid helium. Stainless steel tanks have better air tightness and corrosion resistance. When storing liquid helium, it is important to pay attention to the size of the container, as well as the wall thickness and insulation performance of the tank. If the container for storing liquid helium is too small or the wall thickness is insufficient, it may rupture due to excessive pressure, posing a significant safety hazard.

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III. Tightness and Safety When the container storing liquid helium has poor sealing, liquid helium may leak and generate gas at extremely low temperature. This not only leads to the loss of liquid helium but also damages the place and equipment where the liquid helium is stored. Therefore, when storing liquid helium, the tightness and safety of the container should be ensured. To ensure the safe storage of liquid helium, safety measures such as safety valves and pressure relief pipes need to be set up to promptly discharge excessive gas when the internal pressure of the container becomes too high.

IV. Use and Transportation of Liquid Helium Safety must be taken into account during the use and transportation of liquid helium, such as ensuring the stability of containers and preventing damage during transportation. When using liquid helium, it is necessary to measure it through instruments such as volumeters and barometers to ensure that the amount and pressure of liquid helium meet the requirements. Many issues need to be considered for the storage and use of liquid helium, including storage temperature, airtightness and safety of storage containers, as well as safety measures during use and transportation. In practical operations, it is necessary to carefully read the instructions and safety specifications for the use of liquid helium, and operate according to relevant requirements to ensure the safe and efficient use of liquid helium.