Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Development Zone, Heze City. With a registered capital of 50 million yuan and total assets of 500 million yuan, the company has seven business centers: boilers, deep-freezing containers, pressure vessels, central air conditioning, engineering installation, international trade, and the Internet of Things. It has three manufacturing sites on Jinnan Road, East Yangtze Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop spanning 83,000 square meters. Currently, it employs 710 staff, including 247 engineers and technicians, and 82 intermediate-level technical personnel. 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 Department of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, it was identified as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
When storing liquid nitrogen in low-temperature storage tanks, the following points should be noted:
Protective Gear: When handling low-temperature storage tanks, appropriate protective gear must be worn, including gloves, protective suits, and non-slip shoes. This equipment safeguards the skin from the low temperatures of liquid nitrogen and other hazards.
Avoid direct contact: Liquid nitrogen is extremely cold and can cause chilling. Therefore, it is crucial to avoid direct contact with liquid nitrogen, especially with the skin. Use tools or utensils for handling to prevent direct hand contact with liquid nitrogen.
Ventilation Requirements: In the operating area of low-temperature storage tanks, adequate ventilation must be ensured to expel gases produced by the evaporation of liquid nitrogen. Maintain air circulation to avoid excessive oxygen concentration, reducing the risk of fire and explosion.
Prevent Leaks: Regularly inspect low-temperature storage tanks for leaks and equip with leak detection and alarm systems. In case of a leak, take immediate action to control and repair it. Avoid the hazards of liquid nitrogen leaks to personnel and the environment.
Fire Prevention Measures: Liquid nitrogen has a low boiling and freezing point, which is prone to causing fires. To prevent and contain fires, firewalls are set up around low-temperature storage tanks, and fire-retardant coatings are used.
Static protection: The accumulation of static electricity in low-temperature tanks may 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.
Regular Inspections and Maintenance: Conduct regular checks on the condition of low-temperature storage tanks and related equipment, including valves, pipelines, pressure gauges, etc. Ensure the equipment is in perfect condition without any damage, and promptly repair or replace any damaged parts.
Waste Gas Treatment: Low-temperature storage tanks generate waste gas during operation, which necessitates appropriate waste gas treatment measures to minimize environmental impact.
Above are the precautions to be taken when storing liquid nitrogen in a low-temperature tank, ensuring operational safety and the normal operation of the tank. During the operation, strictly follow the relevant operational procedures and safety requirements to avoid accidents.

Liquid Oxygen Storage Tanks Feature the Following Safety Technical Characteristics:
High-pressure Vessels: Liquid oxygen tanks are high-pressure vessels capable of withstanding high pressure. Their design and manufacturing must comply with relevant standards and regulations to ensure the tank's strength and密封性.
Low-Temperature Storage: Liquid oxygen tanks are used for storing liquid oxygen, with operating temperatures typically around -183 degrees Celsius. The materials and insulation of the tanks must be able to withstand low-temperature environments to prevent evaporation of the liquid oxygen and the penetration of external heat.
Fire-resistant Design: Liquid oxygen has a high oxygen content, which is prone to causing fires. The design of liquid oxygen storage tanks must incorporate fire-resistant measures, such as installing fire walls and using fire-resistant coatings, to prevent the occurrence and spread of fires.
Leakage Control: Leaks in liquid oxygen tanks can lead to increased oxygen concentrations, raising the risk of fire and explosion. Tanks must be equipped with leak detection and alarm systems to promptly detect and control leaks, and to implement appropriate emergency measures.
Electrostatic Protection: Electrostatic buildup in liquid oxygen tanks can cause sparks, increasing the risk of fire. Tanks must be equipped with electroconductive materials and antistatic devices to reduce the accumulation and release of static electricity.
Safety Valves and Pressure Control: Liquid oxygen storage tanks must be equipped with safety valves and pressure control devices to ensure the internal pressure of the tank remains within a safe range. In the event of pressure exceeding the set value, the safety valve will automatically release pressure to protect the tank's safety.
Routine Inspections and Maintenance: Liquid Oxygen Tanks require regular inspections and maintenance.

The cooling process and precautions for liquid argon cylinders are as follows:
Cooling Process Analysis:
Clean Vessel: Prior to cooling the liquid argon cylinder, it is essential to ensure the interior is clean and free of impurities and contaminants. Appropriate cleaning agents can be used for washing, followed by thorough rinsing.
Deaeration and Exhaustion: Remove gas from the container and exhaust it through the exhaust system to reduce the gas content inside the container.
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.
Wait for Cooling: Liquid nitrogen will gradually lower the temperature inside the tank through the process of heat conduction until it reaches the required 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 that there are no ignition sources in the surrounding environment and to equip with appropriate fire extinguishing equipment.
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 a temperature control system can be used to monitor and control the cylinder's temperature.
Insulation and Heat Retention: Liquid argon tanks typically employ double or multi-layered construction, filled with insulating material in the middle to reduce heat transfer and evaporation of liquid argon. Ensure the integrity and excellent insulation of the insulating layer.

The leak treatment methods for liquid argon storage tanks mainly include the following steps:
Identified Air Leaks: Detected through odors, gas detection equipment, or abnormal pressure in liquid argon storage tanks, air leaks in the liquid argon storage tank are identified.
Confirm air leak location: Use gas detection instruments or foam leak detection agents, etc., to pinpoint the exact location of the air leak. Check tank interfaces, valves, pipe connections, and other areas to locate the air leak points.
Seal Air Leaks: Take appropriate measures to stop air leaks based on their location. For instance, for leaks at joints, inspect and adjust gaskets or tighten bolts; for valve leaks, check and replace seals.
Isolate Air Leaks: During the process of dealing with air leaks, it is necessary to isolate the leaky areas to ensure personnel safety. Set up warning signs, restrict access to the area, and take necessary protective measures, such as wearing protective masks, gloves, etc.
Drain liquid argon: If the leakage cannot be repaired immediately or the leakage rate is high, consider draining the liquid argon. By gradually reducing the pressure of liquid argon within the storage tank, it can be converted to gas, minimizing the risk of leakage.
Ventilation Treatment: During the air leak treatment, ensure proper ventilation and promptly remove the gases produced by the evaporation of liquid argon. This can be achieved by natural ventilation or the use of ventilation equipment to exhaust the vaporized argon gases outdoors.
Safety Assessment and Repair: After the air leakage treatment is completed, conduct a safety assessment to ensure the tank's safety. Based on the assessment results, carry out necessary repairs and maintenance to prevent further air leakage.
Note that liquid argon is a low-temperature liquid with a low boiling and freezing point. Extra caution is required when dealing with air leaks to prevent contact with liquid argon and avoid cold exposure. When handling air leaks in liquid argon storage tanks, the operation should be performed by personnel and follow relevant safety operation procedures and standards.
Zhong Jie Special Equipment upholds the grand vision of "realizing the dreams of our employees, creating value for our customers, and striving for the prosperity and strength of our motherland," wholeheartedly devoting ourselves to the development of green energy equipment. We offer society high-value products and services at competitive prices!