Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, an A2-grade pressure vessel manufacturing license, an A2-grade pressure vessel design license, a B-grade boiler installation license, and GB2/Class and GC2/Class pressure pipeline installation licenses, as well as a mechanical and electrical equipment installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the Council Member of the Shandong Equipment Manufacturing Association. The company has also passed the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System certifications, and the American ASME/U2 certification.
Prior to cooling the liquid oxygen tank, the following preconditions must be met:
Clean Tanks: Ensure the interior of the tank is clean, free of impurities and contaminants. The tank should be properly cleaned and flushed to maintain its internal cleanliness.
Drainage and Exhaust: Empty the gas from the storage tank and expel it through the exhaust system to reduce the gas content inside the tank. This helps minimize the interference of the gas on the cooling process.
Safety Precautions: Prior to cooling the liquid oxygen tank, it is essential to implement necessary safety measures. Liquid oxygen is highly flammable and has low-temperature properties. Operators must wear appropriate protective clothing, gloves, and other personal protective equipment to ensure safe operation.
Temperature Control: During the cooling process of the liquid oxygen tank, the temperature of the tank must be controlled. Typically, low-temperature mediums such as liquid nitrogen are used to cool the tank, ensuring that the tank's temperature gradually drops below the boiling point of liquid oxygen.
Insulation and Heat Retention: Liquid oxygen storage tanks are typically designed with double or multi-layer structures, filled with insulating material in between to minimize heat transfer and evaporation of the liquid oxygen. Ensure the integrity and excellent insulation of the insulation layer to enhance the cooling efficiency of the tank.
Under the aforementioned preconditions, the cooling operation of the liquid oxygen tank may be conducted. The cooling process must strictly adhere to the relevant safety regulations and operational guidelines to ensure the safe operation and use of the tank.

A hydrostatic test of a liquid nitrogen storage tank is a common method used to check the tank's sealing and pressure resistance. Below are the general steps for the hydrostatic test of a liquid nitrogen storage tank:
Preparation: Ensure the tank interior is clean and that the tank is empty of gases and liquids. Check the tank's sealing and safety devices for proper operation.
Fill water: Fill the tank with water, ensuring the water level is above the low water mark. Pump or other appropriate methods can be used for filling.
Apply Pressure: Gradually increase water pressure using a pressure pump or other pressure source until the predetermined test pressure is reached. The test pressure is typically 1.1 times the design working pressure of the tank.
Pressure Retention: After reaching the test pressure, maintain it for a period (typically 30 minutes to 1 hour) and observe for any abnormal conditions such as leakage or deformation in the tank.
Pressure Relief: Gradually release pressure to drain water from the tank until the tank is completely empty.
Inspection and Evaluation: Check for leaks, deformations, or other damage on the surface and inside of the tank. Evaluate test results to ensure the tank meets design requirements and safety standards.
需要注意的是，液氮储罐水压试验需要由人员进行操作，并遵循相关的安全操作规程。在进行测试前，应仔细阅读和遵守储罐制造商提供的操作指南和安全注意事项。

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 used 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 in equipment to supply oxygen for uses such as oxygen therapy, oxygen inhalation, and operating rooms. These tanks provide high-purity oxygen while maintaining low temperatures 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 important in various fields including industrial production, equipment, and laboratory research, providing storage and supply functions for liquid oxygen at the application sites.

The filling of low-temperature liquid nitrogen tanks refers to the process of transferring liquid nitrogen from an external supply source into the tank. Below is an explanation of the filling process for low-temperature liquid nitrogen tanks:
Preparation: Prior to filling the liquid nitrogen tank, thorough preparation is required. This includes inspecting the tank's condition and safety, ensuring the interior is clean, free of impurities and contaminants. Additionally, check the quality of the liquid nitrogen from the supply source and the safety of the supply pipeline.
Connect supply source: Link the liquid nitrogen supply source to the liquid inlet of the storage tank. Ensure the connection is tight and secure to prevent leaks.
Control Liquid Level: During the bottling process, it is necessary to control the liquid nitrogen level to prevent overfilling or overflow. A liquid level gauge or a liquid level control system can be used to monitor and control the level.
Slow Injection: The injection of liquid nitrogen should be done slowly to prevent rapid vaporization and pressure increase. Appropriate valves and flow control devices can be used to regulate the injection speed.
Monitor Pressure: During the canning process, it is necessary to monitor the pressure of the storage tank to ensure it remains within the safe range. Pressure gauges or pressure sensors can be used for monitoring.
Canning Complete: Stop injecting liquid nitrogen when the liquid level reaches the predetermined filling quantity or the storage tank's capacity limit. Disconnect the connection to the supply source and ensure the tightness of the filling port.
Safe Operation: Throughout the canning process, relevant safety regulations and operating guidelines must be followed. Liquid nitrogen is highly flammable and extremely cold, so operators should wear appropriate personal protective equipment and ensure there are no ignition sources in the operating environment.
When bottling liquid nitrogen, be mindful of its low-temperature properties and safety. Ensure safe operation and control throughout the bottling process to guarantee the safe operation of the storage tank and effective storage of the liquid nitrogen.
ZJ Special Equipment adheres to the grand vision of "realizing employees' dreams, creating value for customers, and striving for the prosperity and strength of our motherland," and is dedicated to the development of the green energy equipment industry. We offer society high-value products and services!