The liquid nitrogen container is filled with liquid nitrogen, and the characteristics of liquid nitrogen determine that the container needs to be filled regularly, especially if it contains samples!
For example, large-diameter liquid nitrogen tanks in laboratories, ln2 freezers, etc. are usually equipped with stainless steel liquid nitrogen supply tanks, connected by an infusion pipe and controlled by valves. They have fast liquid filling speed, high efficiency, and are safe and low pressure.
The manufacturer recommends 0.05MPa!
But in actual use, as long as the pressure is ≥0.05MPa and <0.09MPa!
The 0.05MPa recommended by the liquid nitrogen supply tank manufacturer is based on actual measurements and found that when the filling pressure is 0.05MPa, the liquid nitrogen flow rate is stable, the infusion speed is fast, and the liquid nitrogen loss is small, which is an economical and efficient value.
When it comes to specific use, the environment of the liquid nitrogen supply tank is different, and the user’s definition of the rehydration speed is different. If you want to complete the rehydration faster and don’t care about a little more liquid nitrogen loss, you can adjust the filling pressure above 0.05MPa . If you want to refill the fluid more slowly and reduce splashing, just adjust it to 0.05MPa, or <0.05MPa.
In addition, it should be noted that the filling pressure of the liquid nitrogen supply tank cannot be less than 0.02MPa, which may cause the supply tank to not be pressurized and the liquid nitrogen transfer cannot be realized. It cannot be ≥0.09MPa, so the liquid nitrogen supply tank will turn on automatic protection and open the safety valve to release the pressure to avoid explosion caused by excessive pressure, threatening personnel safety and causing unnecessary losses!