The safe storage capacity of liquid nitrogen tanks is mainly determined by the volume of liquid nitrogen and the capacity of the storage equipment. Liquid nitrogen is usually measured in liters (L), while the capacity of a liquid nitrogen tank is measured in liters or cubic meters (m³). The density of liquid nitrogen is approximately 0.8 g/L, so the safe storage capacity can be calculated based on the weight of liquid nitrogen.

According to international standards, the safe storage capacity of liquid nitrogen container should be determined based on the following principles:

1. The safe storage capacity should meet actual usage needs. Determine a reasonable storage capacity based on the purpose and frequency of use of liquid nitrogen. For example, if liquid nitrogen is used for sample cryopreservation in the laboratory, the amount of liquid nitrogen used each day and the amount reserved for backup need to be considered.

2. The safe storage capacity should include the evaporation loss of liquid nitrogen. Liquid nitrogen will evaporate at room temperature, so a certain storage capacity needs to be reserved to make up for evaporation losses. According to experience, the safe storage capacity of liquid nitrogen tanks should be 1.2 to 1.5 times the total demand.

3. The safe storage capacity should take emergency situations into consideration. In some special circumstances, such as equipment failure or severe weather causing gas supply interruption, sufficient liquid nitrogen supply needs to be reserved to ensure the continuity of experiments or production. Therefore, it is recommended to add a certain amount of reserve on top of the safe storage capacity to deal with emergencies.

Liquid nitrogen storage tank has become one of the indispensable experimental equipment in scientific research, medical and other fields, and plays an important role. The safe storage capacity of a liquid nitrogen tank depends on several factors, including the usage requirements of the liquid nitrogen and the specifications of the storage equipment.