What are the requirements for the lid of a liquid nitrogen tank? Don’t underestimate this small component

In the entire structure of the liquid nitrogen tank, the lid may seem insignificant, but it is an important part to ensure the safe storage and use of liquid nitrogen. Many people often overlook the design and function of the lid when using liquid nitrogen tanks, unaware that a well-designed and high-quality lid directly affects the storage effect, safety performance, and ease of operation of liquid nitrogen. This article will take you to a deeper understanding of the "big questions" about liquid nitrogen tank lids.

1. Tighter sealing is not necessarily better
The lid of a liquid nitrogen tank is usually not completely sealed, which is often misunderstood. Due to the continuous evaporation of liquid nitrogen under normal pressure, nitrogen gas is formed. If the lid is completely sealed, the pressure inside the tank will rise, posing a risk of tank explosion. Therefore, the lid design of liquid nitrogen tanks needs to balance sealing and pressure relief capabilities. Generally, lightweight floating lids or lids with microporous ventilation structures are used to allow nitrogen gas to naturally escape and maintain pressure balance inside the tank.

2. Material selection is carefully considered
The lid of a liquid nitrogen tank is usually made of high-strength plastic or composite materials, which have good low temperature resistance, impact resistance, and insulation properties. The lid should be able to maintain structural stability in extremely low temperature environments, without brittle cracking or deformation, and also have certain anti slip and anti freezing designs, making it easy for operators to open or close while wearing gloves.

3. Accurate coordination with the tank body is required
High quality liquid nitrogen tank lids are usually specialized accessories that closely match the opening of the tank body, ensuring minimal heat exchange and gas leakage. Loose lids can accelerate the evaporation of liquid nitrogen and affect storage time; Tight lids can affect gas release and pose potential risks. Therefore, the compatibility of the original lid is crucial, and it is not recommended to use non original or universal substitutes.

4. Additional feature design enhances convenience
Modern liquid nitrogen tank lids often have auxiliary functional designs. For example, some models of lids are integrated with handles, locks, temperature monitoring ports, or extraction interfaces for easy experimental operations and sample extraction. In the field of biological sample storage, some lids are also equipped with sample access positioning devices to improve management efficiency.

5. Maintenance and replacement cannot be ignored
Although the lid of the liquid nitrogen tank does not involve complex structures, regular inspections are still necessary due to its frequent opening and contact with extremely low temperature liquids. If there are cracks, deformations, decreased tightness, or abnormal surface frosting, it should be replaced in a timely manner to avoid affecting the storage performance of liquid nitrogen.

conclusion
Although the lid of the liquid nitrogen tank is small, it shoulders the important mission of ensuring low-temperature environment, controlling evaporation rate, and maintaining safe use. When choosing or using liquid nitrogen tanks, do not overlook this seemingly insignificant small component. A scientifically designed and high-quality lid is often the key to achieving safe and efficient liquid nitrogen storage.