Shandong Zhongjie Special Equipment Co., Ltd. (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 7 business centers: boiler, deep-freeze container, pressure vessel, central air conditioning, engineering installation, international trade, and Internet of Things. It has three factory areas on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop area at 83,000 square meters. It currently employs 710 people, including 247 engineering and technical staff and 82 middle-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 Industrial and Information Technology Department. 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.
Carbon dioxide storage tanks and liquid oxygen storage tanks are containers used to store different gases, with some differences in their physical properties:
Physical State: Carbon dioxide is a gas at room temperature and pressure, and it needs to be cooled and pressurized to become a liquid. Liquid oxygen is a liquid at room temperature, and it must be cooled to become a solid.
Boiling and Freezing Points: The boiling point of carbon dioxide is -78.5 degrees Celsius, and its freezing point is -56.6 degrees Celsius. The boiling point of liquid oxygen is -183 degrees Celsius, and its freezing point is -218.8 degrees Celsius. The boiling and freezing points of liquid oxygen are both significantly lower than those of carbon dioxide.
Density: The density of liquid oxygen is relatively high, at about 1.14 grams per cubic centimeter. The density of carbon dioxide is lower, at approximately 0.00198 grams per cubic centimeter. The density of liquid oxygen is about 570 times that of carbon dioxide.
Pressure: Liquid oxygen has a higher pressure, typically ranging from tens to hundreds of megapascals (MPa). Carbon dioxide has a lower pressure, usually in the range of a few megapascals (MPa).
Safety: Liquid oxygen contains a high concentration of oxygen, which is highly flammable and explosive. Carbon dioxide can also be dangerous, causing asphyxiation at certain concentrations.
Note that carbon dioxide and liquid oxygen are both highly flammable and explosive substances. Strict adherence to relevant safety operating procedures and standards, along with necessary safety measures, is required during storage and use to ensure the tank's safety and stability.

Maintenance and precautions for liquid nitrogen storage tanks are crucial; here are some key points:
Maintenance:
Regular Inspections: Conduct regular inspections of the liquid nitrogen tank's appearance, valves, pipes, and other components to ensure they are intact and undamaged. Pay special attention to check for any leaks, corrosion, or other forms of damage.
Clean Storage Tanks: Regularly clean liquid nitrogen storage tanks to remove internal dirt and sediments. Use appropriate cleaning agents and tools, and follow the cleaning procedures and safety operation guidelines.
Liquid Nitrogen Refill: Refill liquid nitrogen on a regular basis as needed. Ensure that there is an adequate storage of liquid nitrogen in the tank to meet usage requirements.
Maintain Pressure: Regularly inspect the liquid nitrogen tank's pressure to ensure it stays within the safe range. Conduct pressure tests and adjustments as necessary.
Corrosion Treatment: Depending on the material of the storage tank and its operating environment, appropriate anti-corrosion measures are taken to extend the lifespan of the tank. For instance, applying anti-corrosion coatings and regular anti-corrosion treatments.
Cautionary Notes:
Safe Operation: Strict adherence to safety operating procedures and standards is mandatory when using liquid nitrogen tanks. Operators must be trained, familiar with the properties of liquid nitrogen and safety operation requirements, and knowledgeable about the tank equipment and operational processes.
Safety Measures: When using liquid nitrogen tanks, necessary safety precautions must be taken, such as wearing protective gloves and suits. Avoid direct contact with liquid nitrogen to prevent cold exposure.
Leak Control: Regularly inspect the liquid nitrogen storage tank for leaks and equip with leak detectors and alarm systems. In case of a leak, immediate measures should be taken to control the leak and carry out repairs.
Ventilation Requirements: In enclosed spaces where liquid nitrogen tanks are in use, proper ventilation must be ensured.

Liquid argon storage tanks are equipment used for storing and transporting liquid argon, featuring the following characteristics:
Low Temperature Retention Performance: The liquid argon storage tank is equipped with special insulation materials and structural design, effectively maintaining the low temperature of liquid argon. The tank is internally lined with insulation to reduce heat conduction and loss, ensuring long-term storage of liquid argon.
High-seal performance: The liquid argon storage tank boasts excellent sealing properties, effectively preventing leakage and evaporation of liquid argon. The tank's valves, fittings, and seals, etc., are designed and manufactured with precision, ensuring reliable sealing performance.
High strength and corrosion resistance: The liquid argon tank is made from high-strength materials, capable of withstanding the high pressure and low temperature of liquid argon. Both the internal and external surfaces of the tank are specially treated for excellent corrosion resistance, able to withstand corrosion and oxidation from liquid argon.
Safety Performance: The liquid argon storage tank is equipped with multiple safety protection measures, including safety valves, pressure sensors, and level monitoring devices. These devices monitor and control the tank's pressure, temperature, and level, ensuring the tank operates within a safe range.
Reliability and Stability: The liquid argon storage tank has undergone rigorous design, manufacturing, and testing, offering excellent reliability and stability. The tank is capable of long-term stable storage and transportation of liquid argon, ensuring that the quality and performance of the liquid argon remain unaffected.
Easy to operate and maintain: The liquid argon tank is relatively simple to operate and maintain, equipped with valves and fittings that are easy to use. The maintenance work mainly includes regular inspections, cleaning, and repairs, which can extend the service life of the tank.
The performance features of liquid argon storage tanks make them an important storage and transportation equipment for liquid argon, widely used in scientific research, industry, and other fields. When using liquid argon storage tanks, it is necessary to strictly comply with the relevant operational specifications and safety requirements to ensure safe use.

Routine maintenance is one of the crucial methods to ensure the safety of low-temperature storage tanks. Here are some common maintenance measures:
Regular Inspections: Conduct regular inspections of low-temperature storage tanks, including checks of the exterior, internal structure, corrosion-resistant coatings, etc. Look for issues such as cracks, corrosion, wear, and promptly identify and repair potential safety hazards.
Cleaning and De-icing: Regularly clean the exterior surface and internal structure of the low-temperature storage tank to remove accumulated dirt and ice layers. The buildup of ice can lead to structural damage and corrosion; cleaning and de-icing can extend the lifespan of the tank.
Level Monitoring: Regularly monitor the liquid level in low-temperature storage tanks to ensure it remains within a safe range. Excessive or insufficient levels can lead to overpressure or over-vacuum in the tanks, increasing safety risks.
Leak Detection: Install a leak detection system to regularly check for leaks in low-temperature storage tanks. Leaks can lead to the release and evaporation of liquids or gases, increasing safety risks.
Corrosion Prevention Measures: Implement appropriate corrosion prevention measures, such as coating protection and corrosion-resistant paints, to safeguard the metal structure of low-temperature storage tanks from corrosion.
Emergency Fault Handling: Establish an emergency fault handling mechanism to promptly address and repair failures in low-temperature storage tanks to prevent accidents from occurring or escalating.
Training and Development of Personnel: Train and develop operators and maintenance staff to ensure they possess the relevant knowledge and skills for the proper operation and maintenance of low-temperature storage tanks.
Note that maintenance and upkeep should be tailored to the specific type of tank and usage conditions, adhering to relevant local regulations, standards, and specifications. During the maintenance process, it is advisable to consult with an engineer or seek guidance from relevant institutions to ensure the tank's safety and reliability.
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