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-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and the Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters, with the main workshop spanning 83,000 square meters. It 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, it was identified as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Liquid oxygen tanks are used for storing and supplying liquid oxygen as fuel and oxidizer, playing a crucial role in launch propulsion systems and more. Industrial Production: Liquid oxygen is used as an oxidizer in industrial production for processes such as combustion, oxidation, and oxygen supply. Liquid oxygen tanks are employed to store and supply liquid oxygen to meet the needs of industrial applications like metal cutting, welding, and chemical reactions. Equipment: Liquid oxygen tanks are used to supply oxygen in equipment such as oxygen therapy, oxygen inhalation, and operating rooms. These tanks provide high-purity oxygen while maintaining a low temperature to meet the equipment's oxygen requirements. Laboratory Research: Liquid oxygen tanks are used in scientific research and laboratories to provide liquid oxygen as experimental materials and reagents. The low temperature and high purity of liquid oxygen make it widely applicable in laboratories for fields such as materials science, chemical reactions, and biomedical research. In summary, liquid oxygen tanks are crucial in various fields including industrial production, equipment, and laboratory research, providing storage and supply functions for liquid oxygen at the application sites.

Liquid nitrogen tanks are used for storing and transporting liquid nitrogen. To ensure safe operation, here are some common operational safety procedures for liquid nitrogen tanks:
Tank Installation: Tanks should be installed on a solid and level foundation, away from fire sources and flammable materials. Good ventilation around the tank is essential to prevent gas accumulation. The tank should maintain a safe distance from other equipment and buildings.
Liquid Nitrogen Filling: When filling with liquid nitrogen, appropriate liquid nitrogen transfer equipment should be used to avoid direct contact. During the filling process, attention should be given to controlling the flow and pressure of liquid nitrogen to prevent over-filling and excessive tank pressure.
Tank Pressure Control: Tanks should be equipped with pressure control devices to ensure internal tank pressure remains within a safe range. Regularly inspect and maintain these devices to ensure proper operation.
Leak Detection and Alarm Systems: Tanks should be equipped with leak detection and alarm systems to promptly identify and alert for any tank leaks. Regularly inspect and maintain the leak detection equipment to ensure proper functioning.
Fire and Explosion Prevention Measures: A fire-resistant buffer zone should be set around the storage tank, keeping it away from ignition sources and flammable materials. The tank itself should implement fire and explosion prevention measures, such as fire-resistant coatings, explosion-proof devices, etc., to prevent fires and explosions.
Regular inspections and maintenance: Conduct regular checks on the tank's appearance, valves, and fittings to ensure they are intact and undamaged. Regularly perform leak detection and pressure tests to ensure the tank's safety performance meets requirements.
Safety Training and Awareness Enhancement: Conduct safety training for operators to enhance their awareness and ability to safely handle liquid nitrogen tanks. Regularly hold safety training and drills to respond to emergencies.
Establish comprehensive management records and documents, including tank usage, inspection, and maintenance records. Regularly review and update these records to ensure safe management and maintenance of the tanks.
Note that the above are some common protection procedures, which may vary depending on the type of tank and application. When using liquid nitrogen tanks, operate according to relevant specifications and standards, and consult with experts to ensure safety and effectiveness.

Maintenance and care of liquid nitrogen tanks are crucial for ensuring safe operation and extending their lifespan. Here are the maintenance and care methods for liquid nitrogen tanks:
Regular Inspections: Conduct regular inspections of the liquid nitrogen tank's exterior and interior, including checking for leaks, corrosion, wear, or other damage. Pay special attention to inspecting the tank's interfaces, valves, and piping, ensuring they operate normally.
Cleaning and Defrosting: Regularly clean the exterior surface of the liquid nitrogen tank to remove dust and dirt. If there is ice or frost inside the tank, defrosting is required to maintain the normal operation of the tank.
Level Monitoring: Regularly monitor the liquid nitrogen tank's level to ensure the storage amount of liquid nitrogen stays within a safe range. If the level is abnormal, adjustments or supplements of liquid nitrogen are required promptly.
Regular maintenance and replacement of components: Regularly inspect and replace critical parts of the liquid nitrogen storage tank, such as safety valves, pressure sensors, and temperature sensors, to ensure their proper operation and accuracy.
Inspect the insulation layer: Regularly check the liquid nitrogen tank's insulation layer to ensure its integrity and insulating performance. If any damage or aging is found in the insulation layer, it should be repaired or replaced promptly.
Regular Calibration: Regularly calibrate the gauges and sensors of liquid nitrogen tanks to ensure accuracy and reliability. Calibration should be conducted according to relevant standards and specifications.
Safety Training and Operating Procedures: Conduct regular safety training for liquid nitrogen tanks to ensure operators are familiar with the safe operating procedures and emergency response measures.
It's important to note that maintenance and care of liquid nitrogen tanks should be performed by trained and authorized personnel. Adhere to the relevant safety regulations and operation guidelines to ensure the safety and effectiveness of maintenance work.

The temperature difference between the interior and exterior of a low-temperature liquid storage tank depends on various factors, including the tank's design, insulation performance, the temperature of the liquid, and the ambient temperature outside. Generally, the temperature inside the low-temperature liquid storage tank is much lower than the ambient temperature outside.
Low-temperature liquid storage tanks are commonly used for storing cryogenic liquids such as liquid nitrogen, liquid oxygen, and liquid argon. These liquids have very low boiling points, typically below -100 degrees Celsius. To maintain the low temperature of the liquids, the tanks must have excellent insulation properties to minimize heat transfer and evaporation loss.
Low-temperature liquid storage tanks typically offer a smaller temperature variance. Generally, the internal temperature of the tank can be maintained near the boiling point of the liquid, usually several tens of degrees Celsius lower than the ambient temperature. The specific temperature variance depends on the tank's design and insulation performance, as well as the properties of the liquid.
It's important to note that the temperature differences in low-temperature liquid storage tanks may change over time. As time goes by, the insulating material's performance may be affected by wear or aging, leading to increased temperature differences. Therefore, regular inspection and maintenance of the tank's insulation are crucial to ensure its effective and stable insulating performance.
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