In order to allow liquid nitrogen to be used, people have developed the principle of vacuum jackets and made liquid nitrogen tanks!
After the liquid nitrogen tank was put into use, everyone found that if you want to use the liquid nitrogen tank for a long time, you must replenish it regularly, because the natural volatilization of liquid nitrogen cannot be avoided. Rehydration requires tools, especially laboratory liquid nitrogen tanks with larger capacity, which will be equipped with self-pressurized liquid nitrogen supply tanks!
Self-pressurized liquid nitrogen supply tank is a new branch of liquid nitrogen container, with its own pressurization system to realize automatic liquid replenishment. Need to pressurize before rehydration, the higher the pressure, the faster the liquid will flow out! Can the self-pressurized liquid nitrogen supply tank be infinitely pressurized?
Of course, no!
Even medium and high pressure stainless steel Dewar bottles have their own pressure range, and it is impossible to pressurize infinitely, let alone a self-pressurized liquid nitrogen supply tank developed from the perspective of safe infusion.
Its pressure does not exceed 0.1MPa, and the actual use is only 0.09MPa. In order to avoid excessive pressure caused by user misoperation, the liquid nitrogen supply tank is also equipped with double safety valves, which will automatically open and release the pressure when the pressure reaches 0.09MPa to prevent the pressure from being too high. The explosion of the liquid nitrogen container caused by the pressure will cause danger and cause irreversible loss.
In addition, everyone needs to know that if each supply tank can be infinitely pressurized, there will be no distinction between medium pressure, high pressure and low pressure!
Moreover, the self-pressurized liquid nitrogen supply tank is not a pressure vessel, it is only a liquid nitrogen supply tank, the working pressure is even ≠0.1MPa, and the pressure is 0 when the liquid nitrogen is stored statically. Therefore, the self-pressurized liquid nitrogen supply tank It cannot be supercharged indefinitely!