Shandong Zhongjie Special Equipment's main products include: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG tanks, oxygen/nitrogen/argon tanks, and CO2 tanks; pressure vessel products such as denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment; central air conditioning and HVAC equipment such as ground (water) source heat pumps, air source units, water-cooled screw units, and air-cooled modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
The primary reason for pre-cooling a liquid oxygen tank before use is to lower the internal temperature of the tank, bringing it below the boiling point of liquid oxygen, in order to convert the oxygen into a liquid state.
The boiling point of liquid oxygen is -183°C, and at room temperature, oxygen exists in a gaseous state. Liquid oxygen tanks require cooling the oxygen below its boiling point to convert it into a liquid for storage and supply.
The pre-cooling process typically includes the following steps:
Clean Storage Tanks: First, the tank must be thoroughly cleaned to ensure there are no impurities or contaminants inside, to avoid affecting liquid oxygen.
Drainage and Exhaust: To empty the gas inside the tank and expel it through the exhaust system to reduce the gas content within the tank.
Add Liquid Nitrogen: Inject liquid nitrogen into the tank, which will rapidly cool the air and walls inside the tank due to its low temperature, thus lowering the tank's temperature.
Wait for Cooling: The liquid nitrogen within the storage tank will gradually lower the temperature of the tank through thermal conduction until it reaches below the boiling point of liquid oxygen.
The purpose of pre-cooling is to ensure that the temperature inside the storage tank is low enough to meet the storage and supply requirements for liquid oxygen. Pre-cooling can reduce the evaporation and loss of liquid oxygen, while also helping to maintain the safety and stability of the tank.

A 50-cubic-meter liquid oxygen tank refers to a storage tank with a capacity of 50 cubic meters. Liquid oxygen tanks are commonly used for storing and supplying liquid oxygen, applicable in fields such as experiments and research.
Key features and configurations of a 50 cubic meter liquid oxygen storage tank may include the following aspects:
Volume: A 50-cubic-meter liquid oxygen storage tank can hold a large quantity of liquid oxygen.
Structure: Liquid oxygen tanks are typically designed with double or multi-layered structures, filled with insulating material in the middle to minimize heat transfer and evaporation of the liquid oxygen. The tank material is usually stainless steel or aluminum alloy, offering excellent corrosion resistance and low-temperature performance.
Insulation Layer: The insulation layer of liquid oxygen storage tanks is typically made of multi-layered insulating materials, such as polyethylene foam, glass fiber, and vacuum layers, to reduce heat transfer and the evaporation of liquid oxygen.
Temperature Control System: Liquid oxygen storage tanks are typically equipped with a temperature control system to regulate the tank's temperature and maintain the低温 state of liquid oxygen.
Safety Equipment: Liquid oxygen tanks are usually equipped with safety devices such as pressure sensors, temperature sensors, and safety valves to ensure safe operation of the tank.
It is crucial to adhere strictly to the relevant safety regulations and operating guidelines when using liquid oxygen tanks to ensure their safe operation and use. Liquid oxygen is highly flammable, so fire prevention measures must be taken when using liquid oxygen tanks, and it is essential to ensure there are no sources of fire nearby.

Liquid Oxygen Storage Tanks are equipment used for storing and supplying liquid oxygen. Liquid oxygen is a state where oxygen is cooled below its boiling point, converting it into a liquid. Liquid oxygen storage tanks are typically designed with double or multi-layer structures, filled with insulating material in between to minimize heat transfer and evaporation of the liquid oxygen.
The liquid oxygen tank features the following characteristics:
High Purity: The liquid oxygen storage tank contains high-purity liquid oxygen, typically exceeding 99.5% purity. This makes the liquid oxygen storage tank crucial for applications requiring high-purity oxygen, such as medical, aerospace, and research fields.
Low Temperature: Liquid oxygen has a boiling point of -183°C, hence the liquid oxygen storage tank must have excellent thermal insulation to maintain its low temperature. The tank is typically designed with double or multi-layer structures, filled with insulation material in between to reduce heat transfer and the evaporation of liquid oxygen.
High Pressure: Liquid oxygen tanks typically need to withstand high pressure to maintain their liquid state. The design and material selection of the tank must consider the pressure requirements of liquid oxygen to ensure the tank's safety and reliability.
Flammability: Liquid oxygen is highly flammable and supports combustion. Therefore, fire prevention measures must be implemented during the design and use of liquid oxygen storage tanks, ensuring no ignition sources are present around the tank and appropriate fire extinguishing equipment is available.
High Density: Liquid oxygen has a higher density than gaseous oxygen, allowing liquid oxygen tanks to store more oxygen. This gives liquid oxygen tanks an advantage in applications requiring large oxygen supplies, such as in the field.
The use of liquid oxygen tanks must strictly adhere to relevant safety regulations and operating guidelines to ensure safe operation and usage of the tank.

Liquid Oxygen Storage Tank is a specialized equipment that requires special attention to safety and an understanding of its characteristics when in use. Below are the precautions and features for using a liquid oxygen storage tank: **Precautions:** - **Operation:** The operation of the liquid oxygen storage tank should be conducted by personnel who have been trained and possess relevant experience. Operators should be familiar with the tank's structure, performance, and operating procedures, and operate strictly according to the manual and safety regulations. - **Fire Prevention Measures:** Liquid oxygen is highly oxidizing and can easily cause fires and explosions. Open flames and sources of sparks and high temperatures should be prohibited around the storage tank. Fire prevention equipment and fire extinguishing materials should be established and regularly inspected and maintained. - **Leakage Control:** In the event of a leakage, immediate measures should be taken for leakage control. Leakage can lead to evaporation of liquid oxygen and an increase in oxygen concentration, raising the risk of fire and explosion. A leakage alarm system should be established, and leakage control devices and personal protective equipment should be provided. - **Insulation Protection:** The liquid oxygen storage tank should have good insulation protection to reduce evaporation of liquid oxygen and maintain a low temperature state. The insulation layer should be regularly inspected and maintained to ensure its integrity and insulating properties. - **Safety Distance:** A certain safety distance should be maintained around the liquid oxygen storage tank to prevent the spread of fires, explosions, and leaks. The specific requirements for safety distance should be evaluated and determined according to local regulations and standards. **Features:** - **High Oxidizing:** Liquid oxygen is highly oxidizing and can support combustion and cause more intense burning. Therefore, special attention to fire and explosion prevention measures is required when using a liquid oxygen storage tank. - **High-pressure Storage:** Liquid oxygen storage tanks typically store high-pressure oxygen, with pressures generally around 2-5 bar. Therefore, attention should be paid to pressure control and the safety of pressure relief devices during operation and maintenance. - **Low-temperature Storage:** The liquid oxygen in the storage tank is at a low temperature, usually around -183°C. Therefore, when contacting the liquid oxygen storage tank, it is necessary to wear appropriate protective gear.
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