The liquid nitrogen transfer tank is a low pressure tank;
That is, a cryogenic container with a working pressure not exceeding 0.1MPa;
Due to the structural setting, for the self-pressurized liquid nitrogen tank, it is not called high pressure if it exceeds 0.1MPa, but anything too close to this value is called high pressure!
What should I do if the pressure of the self-pressurized liquid nitrogen tank is too high? How to do the decompression treatment?
1.The booster valve is too open during work
The liquid nitrogen transfer tank needs pressure to transport liquid nitrogen, and the booster valve must be opened for pressurization.
The larger the booster valve is, the faster the pressure increases, but this pressure is controllable, and the specific value can be seen from the pressure gauge.
Once it is found that the pressure gauge value is close to 0.09MPa, you should immediately stop turning the booster valve and turn it back a little. If there is no effect, close the booster valve directly, and open the vent valve to release part of the pressure.
2.The empty valve is not opened in the non-working state
When the liquid nitrogen transfer tank is stationary, it is necessary to close the vent valve.
In this way, on the one hand, it can prevent the external moist air from entering the liquid nitrogen tank, which is affected by the low temperature of liquid nitrogen and forms ice blockage;
On the other hand, it is to avoid heat entering, liquid nitrogen gasification, and pressure increase.
If the vent valve is not closed in the non-working state, the pressure will also increase with time;
Therefore, the vent valve must be opened in the non-working state, and the pressure rise at this time also reminds you to open the vent valve.