Different types of liquid nitrogen tanks have different uses. Open tanks store liquid nitrogen for samples and long-term low-temperature storage. Non-open tanks replenish open liquid nitrogen containers, which will have a little low pressure and can output liquid nitrogen with high efficiency. Replenish the liquid nitrogen tank required to preserve samples.
There are many users of open-top liquid nitrogen tanks, which are pressure-free. They are familiar with the relevant operations after years of use and rarely have questions about problems. But the low-pressure liquid nitrogen tank is different. It is a liquid nitrogen supply container, and it is different from the liquid nitrogen pump. It is an emerging liquid nitrogen supply tank in the laboratory. It also involves a little bit of operating pressure. Regarding its safety, is it dangerous? Users still have to Be skeptical!
Whether it is dangerous or not depends on how the user uses it!
Follow the instructions strictly and there is no danger if there is no improper operation!
The pressure setting of low-pressure ln2 tank is not higher than 0.1MPa, and in actual use, the pressure will not exceed 0.09MPa. It is pressurized by the evaporation of internal liquid nitrogen. In view of the low boiling point of liquid nitrogen and the inevitable daily volatilization, manufacturers add a vent valve to it, which is opened when it is left to be stored, so that the volatilized liquid nitrogen can be discharged, and the external moisture Air cannot enter either.
Therefore, strictly speaking, the low-pressure ln2 tank is a pressureless liquid nitrogen container. It has an “exhaust port”. It will only be pressurized when it needs to rely on pressure to output liquid nitrogen, and it is a low pressure that will not be higher than 0.09MPa. Usually It is 0.05MPa. There is no pressure when there is no pressure increase. There is also a double safety valve design, which automatically opens the forced pressure relief when the pressure = 0.09MPa to avoid explosion caused by excessive pressure.
But everyone should know that although commercially available low-pressure ln2 tanks have dual safety valves, the safety valve can protect users who strictly follow the instructions but accidentally forget to open the vent valve or open the boost valve too large. If the safety valve is forced to be replaced, or the tank is modified without contacting the manufacturer, in this case, the low-pressure ln2 tank may be dangerous!
Therefore, whether a low-pressure ln2 tank is dangerous or not actually depends on the user! But it is not dangerous in itself!