Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Economic and Technological Development Zone, Heze City. With a registered capital of 50 million yuan and total assets of 500 million yuan, the company operates seven business centers: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and the Internet of Things. It has three manufacturing sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop spanning 83,000 square meters. The company currently employs 710 staff, including 247 engineers and technicians, and 82 intermediate-level technicians. In December 2016, it was recognized as a "High-tech Enterprise" by the Science and Technology Department. In June 2021, it was identified as a "Specialized and New Enterprise in Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Liquid oxygen stations are facilities used for storing and supplying liquid oxygen, with liquid oxygen storage tanks being a crucial component of these stations. The liquid oxygen storage tanks have several important functions and characteristics:
Liquid Oxygen Storage: Liquid oxygen tanks are primarily used for storing liquid oxygen, cooling gaseous oxygen below its critical temperature to convert it into a liquid state. The storage density of liquid oxygen is high, allowing for the storage of large amounts of oxygen in a relatively small space.
Maintain Low Temperature: Liquid oxygen tanks are typically designed with a double-layer structure, separated by a vacuum layer between the inner and outer layers to reduce heat conduction and maintain low temperatures. This helps to preserve the低温 state of liquid oxygen and prevent premature vaporization.
Safety Design: Liquid oxygen tanks must be designed and manufactured with safety in mind. They are typically made from high-strength materials such as stainless steel or aluminum alloy to withstand high pressure and low-temperature conditions. Additionally, liquid oxygen tanks are equipped with safety valves, pressure sensors, and temperature sensors to ensure that the internal pressure and temperature of the tank remain within safe limits.
Supply System Connection: Liquid oxygen tanks are typically connected to the supply system to transport liquid oxygen to the required locations. The supply system includes liquid oxygen pumps, pipelines, and valves, etc., which are used to extract liquid oxygen from the tank and deliver it to the user end.
Liquid oxygen storage tanks play a crucial role in storing and maintaining liquid oxygen at liquid oxygen stations. Their design and use must strictly adhere to relevant safety regulations and operational procedures to ensure the safety and reliability of the storage and supply process.

The materials used for liquid oxygen tanks typically require excellent low-temperature resistance and corrosion resistance. Common materials for manufacturing liquid oxygen tanks include:
Stainless Steel: A commonly used material for making liquid oxygen storage tanks, stainless steel boasts excellent corrosion resistance and mechanical strength. Common stainless steel grades include 304 and 316.
Aluminum Alloy: Aluminum alloys are also commonly used in the manufacturing of liquid oxygen tanks, featuring low density and excellent corrosion resistance. Common aluminum alloy materials include 5083 and 6061 aluminum alloys.
Fiberglass Reinforced Plastic (FRP): FRP is a composite material composed of glass fibers and resin. It boasts excellent corrosion resistance and mechanical strength, making it suitable for liquid oxygen storage tanks in special environments.
Carbon Steel: Carbon steel is a common material used in tank fabrication, known for its high strength and corrosion resistance. However, it tends to undergo oxidation in liquid oxygen environments, necessitating anti-corrosion measures.
It's important to note that the choice of materials for liquid oxygen tanks should be determined based on specific application requirements, working conditions, and safety standards. When selecting materials, consider the properties of liquid oxygen and the design requirements of the tank to ensure safety and reliability. Additionally, manufacturers and suppliers often provide material selection advice and technical support.

The application of low-temperature liquid storage tanks should pay attention to the following matters:
Safe Operation: Operators must receive training to understand the tank's operational procedures and safety precautions. Adhere to proper operational steps to ensure safe operation.
Protective Gear: Operators should wear appropriate protective gear, such as insulated clothing, gloves, etc., to safeguard against injuries from low-temperature liquids.
Leak Prevention: Regularly inspect the seals of storage tanks and associated pipelines to prevent leaks of low-temperature liquids. Keep the area around the tank clean to avoid debris hindering leak detection and handling.
Fire Protection: Low-temperature liquids are highly flammable and fire precautions must be taken. Keep the storage tank area free from ignition sources, prohibit smoking and open flames. Equip with appropriate fire-fighting equipment to address fire risks.
Pressure Control: Regularly inspect and maintain the pressure control system of the storage tank to ensure the pressure inside remains within a safe range. Safety valves and pressure sensors, among other equipment, should operate normally, and abnormal pressure situations should be detected and addressed promptly.
Insulation Protection: Low-temperature liquid storage tanks should be equipped with an effective insulation layer to reduce heat transfer and liquid evaporation. The selection and installation of the insulation layer should comply with relevant standards and requirements.
Regular Inspections and Maintenance: Conduct regular inspections of the tank's exterior and interior, including checking for leaks, corrosion, wear, or other damage. Pay special attention to the tank's interfaces, valves, and pipelines, ensuring they operate normally.
Emergency Preparedness: Develop an emergency response plan, including measures for leaks, fires, and other unforeseen incidents. Operators should be familiar with the emergency response plan and equipped with appropriate emergency equipment and firefighting supplies.

Possible reasons for increased liquid nitrogen tank liquid loss may include:
Evaporation Loss: Liquid nitrogen is a cryogenic liquid with a boiling point of -196 degrees Celsius. Even under good insulation conditions, it will evaporate. Therefore, the main cause of liquid nitrogen tank loss is evaporation. If the insulation layer of the tank is damaged or the insulation performance is poor, the evaporation loss will increase.
Leakage: A leak in a liquid nitrogen storage tank can also lead to increased liquid loss. Leaks may occur at the tank's joints, valves, pipelines, and other locations. Leaks can be caused by equipment aging, material fatigue, improper operation, and other factors.
Improper operation: Incorrect operation and maintenance can also lead to increased liquid nitrogen tank liquid loss. For example, frequently opening the tank lid, leaving the lid open for extended periods, and failing to repair leaks in a timely manner.
Environmental Factors: Environmental factors can also affect the liquid nitrogen tank's liquid loss. For instance, high temperatures can decrease the tank's insulating performance, thereby increasing evaporation loss.
To minimize liquid nitrogen loss in storage tanks, the following measures can be taken:
Ensure the insulation of the tank is intact and perform regular inspections and maintenance.
Regularly inspect the tank's interfaces, valves, pipelines, etc., to ensure good sealing performance and prevent leaks.
Strictly control the frequency and duration of tank openings to prevent unnecessary liquid evaporation.
Avoid using liquid nitrogen tanks in high-temperature environments or take cooling measures to maintain a low ambient temperature around the tanks.
It should be noted that liquid nitrogen tank liquid loss is inevitable, but with reasonable operation and maintenance, it can be minimized to a low level.
Our company attaches great importance to technological innovation and research and development. We have one municipal enterprise technology center in Heze City, equipped with non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and other testing facilities. We have over 600 various instruments and equipment, including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, etc. The key products we have developed, such as temperature and pressure vessel welding, biomass boiler emission reduction, and waste heat recovery, have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, key projects in Shandong Province, and Heze City innovation and excellence projects. We have accumulated 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. Our technical team, in collaboration with Professor Yajiang Li from Shandong University, has jointly developed deep cryogenic container processing technology using the international plasma arc + filler wire argon arc welding (PAW-GTAW) technology. After the provincial level scientific and technological achievement evaluation, the technical level has reached international standards in the field of deep cryogenic container manufacturing. Choose Zhongjie Special Equipment, and let's create brilliance together!