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What Is The Working Pressure Of Liquid Nitrogen Tank?

Edit: Henan Tianchi Instrument Equipment Co., Ltd    Date:2017-11-20
We know that the critical temperature for nitrogen is -147 ° C and the critical pressure for critical temperature is 3.4 MPa. According to thermodynamic knowledge, nitrogen is above liquefied when it is above the critical temperature. However, when searching for nitrogen gas tank, we actually found that the working pressure of nitrogen gas tank on the market is not only not higher than 3.4 MPa, but much lower than 3.4 MPa.
The temperature is lower than the critical temperature, the general temperature of liquid nitrogen tank minus 190 or so, the pressure is generally about 0.3-0.8 This is a low pressure tank. There are also high-pressure tank, you can reach 2,88 Mpa liquid nitrogen tank, also known as the degree of jar, low temperature insulated cylinders, has a very warm effect, but will also absorb heat to increase the pressure, after all, will not be absolutely warm.
After the pressure is increased, the maximum design pressure of the tank is reached. The tank has a safety valve that automatically opens and releases the gasified part of the hot gas until the pressure has been reduced to the design pressure of the tank. The safety valve will automatically shut down.
Liquid nitrogen storage tank design temperature is -196 ℃, the design of conventional pressure, there are two, one is 0.8MPa, the other is 1.6MPa, these two design pressures are based on the needs of the user. Nitrogen under pressure, when the temperature reaches -196 ℃, it will become a dark blue liquid, that is, liquid nitrogen, liquid nitrogen storage can be pressure-free storage can be stored. The temperature from the air separation is not much difference, but the temperature will get higher and higher as time goes by, and the density of liquid nitrogen will become smaller.