Self-pressurized liquid nitrogen tank, a liquid nitrogen biological container with pressure, the quality of work under pressure is unequivocal.
To judge whether a self-pressurized liquid nitrogen tank is qualified, in addition to the implementation standards, there are also performance indicators, that is, whether the materials used are of high quality, whether the structural design is reasonable, whether the vacuum degree can meet the standards, etc. The details are as follows.
1.Look at the degree of vacuum
The vacuum degree of the interlayer of the self-pressurized liquid nitrogen tank shall meet the requirements of GB/T 18443.2.
If it does not meet the requirements, the performance of the storage tank will be greatly reduced, the service life will be affected, and liquid nitrogen will be wasted virtually.
2. Look at the insulation
The GB/T 16447-2012 standard stipulates that the reflective material for the thermal insulation layer of the self-pressurized liquid nitrogen tank should be aluminum foil or double-sided aluminized polyester film.
The glass fiber cloth and fiber paper used for the thermal insulation layer should be made of materials with low thermal conductivity and low outgassing rate.
If the material is unqualified, the evaporation of liquid nitrogen will increase, which will not meet the requirements.
3.Look at the valve
The valve should be a low temperature shut-off valve, resistant to -196 ℃, even if the liquid nitrogen leaks, the valve will not freeze and cannot be handled.
4.Look at the container material
The GB/T 16447-2012 standard stipulates that austenitic stainless steel, that is, 304 stainless steel, is used for self-pressurized liquid nitrogen containers.
If the self-pressurized liquid nitrogen tank is unqualified, it will not only affect the use, but even be dangerous. After all, it works under pressure. For peace of mind, in addition to comparing the above content, you can also look at the official certification. For example, the Tianchi self-pressurized liquid nitrogen tank has ISO9001 and EU CE certification.