The cryogenic storage tank is equipped with a dual-level alarm interlock system

Cryogenic storage tanks are widely used in industrial fields. In order to ensure the safe use of cryogenic storage tanks, a nitrogen seal should be installed between the inner and outer middle layers of the cryogenic storage tank to maintain the positive pressure of the middle layer to prevent humid air from entering and to ensure good thermal insulation performance of chemical products . In addition, what safety protection measures are required for cryogenic storage tanks?
 
For example, the inner tank of a cryogenic storage tank should be equipped with a set of liquid level alarm interlocking system. When the liquid level of the cryogenic storage tank is higher than the set value, the high liquid level alarm is activated, and when the high liquid level is reached, the interlock system is activated. Shut off the valve on the intake pipe of the cryogenic storage tank.
 
When the liquid level in the cryogenic storage tank is lower than the set value, a low liquid level alarm will be triggered. When the low liquid level is reached, the interlock system is activated, the valve on the liquid discharge pipe of the cryogenic storage tank is cut off, and the loading pump is closed. In addition, there will be two sets of pressure monitoring and alarm interlocking systems. When the pressure of the cryogenic storage tank is higher than the set value, a high-pressure alarm will be triggered, the interlock system will be activated, and the automatic valve on the LNG storage tank pressurization system pipeline will be cut off. , Stop enhancement. When the cryogenic storage tank pressure is lower than the set value, the low-pressure alarm will be activated and the return valve of the BOG compressor will be opened to ensure that the pressure in the storage tank will not form negative pressure. When the low pressure is reached, the interlock system is activated, the automatic valve on the pipeline of the cryogenic storage tank pressurization system is opened, and the liquid cryogenic storage tank is pressurized into an internal storage tank.
 
Not only that, the cryogenic storage tank also has a complete safety system, that is, a two-group safety valve and a two-group breathing valve, and the three-way valve is used for switching. When the inner tank pressure exceeds 25kPa, the safety valve will release and release the pressure; when the internal tank pressure is lower than -0.5kPa, the breathing valve opens and air enters the internal tank to ensure that equipment damage and problems are avoided.