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 deep-freeze pressure vessels such as LNG storage tanks, oxygen/nitrogen/argon storage tanks, and CO2 storage tanks; pressure vessel products such as denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment sets; central air conditioning and HVAC equipment like 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.
Safety operation and transportation of liquid oxygen tanks should be mindful of the following points:
Safe Application Methods:
Tank Selection: Choose liquid oxygen tanks that comply with regulations and standards, ensuring their quality and safety performance.
Tank Installation: Tanks should be installed on a solid foundation to ensure stability. Additionally, the area around the tank should be well-ventilated and kept away from flammable materials and heat sources.
Sealability Inspection: Regularly check the sealing performance of the storage tank to ensure there are no leakage issues at valve and pipeline connections.
Pressure Control: Tanks should be equipped with pressure gauges and safety valves, and undergo regular inspections and maintenance to ensure pressure remains within safe limits.
Fire Prevention Measures: Liquid oxygen contains a high oxygen content and is highly flammable. Install fire barriers around the storage tanks, prohibit smoking and open flames, and ensure safety.
Static Protection: During the transportation and use of liquid oxygen, static electricity can cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment are taken to reduce the accumulation and release of static electricity.
Shipping Precautions:
Transportation Vehicle Selection: Choose transportation vehicles that meet the requirements for liquid oxygen transport, ensuring their safety and seal integrity.
Loading and Unloading: During the transportation of liquid oxygen, the following loading and unloading procedures should be adopted:

Low-temperature liquid storage tanks (such as liquid nitrogen, liquid oxygen, liquid argon, etc.) offer several advantages:
High-density Storage: Low-temperature liquid storage tanks can convert gases into liquids, significantly enhancing storage density. Compared to gas storage, liquid storage can hold more material in a relatively smaller space, improving storage efficiency.
Low-Temperature Retention: The low-temperature liquid storage tank has excellent insulation properties, effectively maintaining the low temperature of the liquid. The design and construction of the insulation layer reduce heat conduction and heat, keeping the liquid at a low temperature and minimizing evaporation and loss.
Supply: Low-temperature liquid storage tanks ensure stable and consistent liquid supply. With internal pressure control and pipeline system design, precise liquid delivery is achieved to meet industrial production and laboratory requirements.
Safety: Low-temperature liquid storage tanks offer high safety. Compared to gas storage, liquid storage reduces the risk of gas leakage and explosion. Tanks are typically equipped with safety devices, such as pressure relief valves and level alarms, to ensure timely action can be taken in abnormal situations, protecting the tank's safety.
Multi-functional Applications: Low-temperature liquid storage tanks are widely used in various fields such as industrial production and scientific research. Liquids like liquid nitrogen and liquid oxygen are suitable for uses such as freezing, refrigeration, and gas supply, meeting diverse industry needs.
In summary, low-temperature liquid storage tanks offer advantages such as high-density storage, temperature retention, supply, safety, and versatile applications, providing reliable liquid storage and supply solutions for various fields.

The daily inspection content of liquid nitrogen storage tanks primarily includes the following aspects:
Visual Inspection: Check for any obvious damage, deformation, or corrosion on the tank's exterior, including the tank walls, valves, pipes, and joints.
Sealability Inspection: Verify the sealing performance of the storage tank, including checking for any leakage at valve and pipe joints, and ensuring the exhaust valve and safety valve of the tank are functioning properly.
Pressure Check: Verify that the storage tank's pressure gauge is functioning properly, and that the pressure is within the normal range, to ensure the tank operates normally.
Level Check: Monitor the liquid nitrogen tank's level to ensure it remains within the normal range, avoiding issues caused by levels that are too high or too low.
Insulation Layer Inspection: Verify that the insulation layer of the tank is intact, with no damage or detachment, to ensure effective insulation and minimize evaporation losses of liquid nitrogen.
Leak Inspection: Check for signs of liquid nitrogen leakage around the storage tank, including frost, ice, or liquid nitrogen stains on the ground.
Safety Equipment Inspection: Verify that the storage tank's safety equipment, such as leak detectors, alarm systems, and safety valves, are functioning properly to ensure the tank's safety.
Cleaning Inspection: Regularly clean the interior of the tank to remove accumulated impurities and dirt, maintaining the tank's cleanliness and hygiene.
Above are the key contents for the daily inspection of liquid nitrogen tanks. The specific inspection items should be adjusted and supplemented according to the tank's model, usage, and relevant regulations. During the inspection process, strict adherence to the operational procedures and safety operation requirements is essential to ensure the safe operation of the tank.

The cooling process and precautions for liquid argon cylinders are as follows:
Cooling Process Analysis:
Clean the Cylinder: Before cooling the liquid argon cylinder, ensure the interior is clean with no impurities or contaminants. Use an appropriate cleaner for cleaning and rinse thoroughly.
Drainage and Exhausting: 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 can rapidly cool the air and walls inside the tank, thereby lowering the tank's temperature.
Waiting to Cool: Liquid nitrogen will gradually lower the temperature inside the container through heat conduction until it reaches the desired low temperature.
Cautionary Notes:
Safety Protection: Necessary safety precautions must be taken during the cooling process of liquid argon tanks. Liquid argon has low temperatures and high flammability, so operators should wear protective suits, gloves, and other personal protective equipment to ensure safe operation.
Fire Prevention Measures: Liquid argon is highly flammable; hence, during the cooling process of the liquid argon tank, it is essential to ensure there are no ignition sources in the surrounding environment and to have appropriate fire extinguishing equipment on hand.
Temperature Control: During the cooling process of the liquid argon cylinder, it is necessary to control the cylinder's temperature to prevent overcooling or insufficient cooling. Temperature sensors and temperature control systems can be used to monitor and regulate the cylinder's temperature.
Insulation and Heat Retention: Liquid argon cylinders are typically constructed with double or multi-layered structures, filled with insulating material in the middle to reduce heat transfer and evaporation of the liquid argon. Ensure the integrity and good insulating properties of the insulation layer.
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