The liquid nitrogen supply tank is a vacuum structure container that exists for liquid nitrogen biological container replenishment. It is used by scientific research laboratories, university research institutes, or exists as a liquid nitrogen tank replenishment container for biobanks. It relies on its own pressurization system to realize liquid nitrogen output.

Due to the particularity of the place of use, the liquid nitrogen supply tank pays special attention to safety. The maximum pressure will not exceed 0.1MPa, and there are double safety valves to strengthen protection to avoid uncontrollable dangers caused by pressure exceeding 0.09MPa.

But this does not mean that the pressure can be allowed to increase until 0.1MPa!

For example, some users rely too much on the safety design of the liquid nitrogen supply tank itself, and do not operate according to the standard, or only close the liquid outlet valve after the liquid nitrogen output is completed, and do not close the booster valve; or only close the liquid outlet valve, Booster valve, vent valve not open.

It turned out not long after that the liquid nitrogen supply tank was constantly venting, making a frightening hissing sound because of the high pressure. What should I do? How can the pressure of the liquid nitrogen supply tank be adjusted down?

Check the status of each valve first. If the booster valve is open, please close the booster valve immediately, and then open the vent valve.

If the booster valve is closed and the vent valve is not open, please open the vent valve immediately to assist pressure relief!

Those hissing noises due to high pressure are actually exhausting, but the safety valve is “awakened” to open self-protection and play the role of deflation, so as to prevent the pressure in the liquid nitrogen tank from being too high and causing an explosion.

Generally, after the booster valve is closed and the vent valve is opened, the pressure inside the liquid nitrogen supply tank will slowly drop, and when the pressure drops to a safe range, the hissing will stop! In addition, remind everyone that when the stainless steel liquid nitrogen tank is in a static state, pay attention to check the pressure gauge to ensure that the pressure is always zero, so that there will be no exhaust problems!