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 7 business centers: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and 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 people, 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 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.
When using a 50-cubic-liter liquid oxygen storage tank, the following safety concerns should be noted:
Tank Pressure Control: Ensure the liquid oxygen pressure within the tank is consistently maintained within a safe range. Monitor and control the tank's pressure to avoid safety risks from either excessively high or low pressure.
Leakage and Fire Prevention: Regularly inspect the seals of tanks and related pipelines to prevent oxygen liquid leakage. Oxygen liquid is highly flammable, and fire prevention measures must be taken to ensure there are no ignition sources around the tank.
Explosion-proof Measures: Oxygen in the liquid oxygen storage tank may cause an explosion upon contact with flammable materials. Ensure there are no flammable items around the tank and implement explosion-proof measures, such as explosion-proof electrical equipment and static grounding.
Safety Valves and Ventilation Systems: Storage tanks should be equipped with safety valves and ventilation systems to prevent overpressure conditions. Ensure the proper functioning of the safety valves and the unobstructed flow of the ventilation system.
Routine Maintenance and Inspection: Regularly maintain and inspect the storage tanks, including cleaning, coating protection, and anti-corrosion treatment. Ensure the structural integrity and safety of the tanks.
Safety Operation and Training: Operators must undergo relevant safety training, familiarize themselves with the safe operation procedures and emergency response measures for liquid oxygen storage tanks. Adhere to correct operational steps to ensure safe operation.
Environmental Monitoring: Regularly monitor the oxygen concentration and temperature, among other environmental parameters, around the storage tanks to ensure environmental safety.
Emergency Preparedness: Develop an emergency response plan including measures for leaks, fires, and explosions. Equip with appropriate emergency equipment and firefighting gear to handle unexpected incidents.
Above are some safety issues to be aware of when using 50-cubic-liter liquid oxygen tanks. To ensure safety, it is recommended to follow relevant safety regulations and operational guidelines, and seek assistance and guidance from experts when necessary.

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: Before 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 outlet of the storage tank. Ensure the connection is securely fastened 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 avoid rapid vaporization and increased pressure. 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 tank's pressure to ensure it remains within a safe range. Pressure gauges or pressure sensors and similar equipment can be used for monitoring.
Canning completed: Stop injecting liquid nitrogen when the liquid level reaches the predetermined filling quantity or the tank's capacity limit. Disconnect the connection to the supply source and ensure the sealing of the filling port.
Safety Operation: Throughout the entire bottling process, relevant safety regulations and operational guidelines must be followed. Liquid nitrogen is highly flammable and at low temperatures; operators should wear appropriate personal protective equipment and ensure there are no sources of ignition in the operating environment.
When bottling liquid nitrogen, be mindful of its low-temperature characteristics and safety. Ensure safe operation and control during the bottling process to guarantee the safe operation of the storage tank and the effective storage of liquid nitrogen.

Material control for low-temperature liquid storage tanks is a crucial aspect in ensuring the safety and reliability of the tanks. The following are some common material control measures:
Material Selection: Choose materials suitable for low-temperature environments, such as low-temperature alloy steel, stainless steel, etc. These materials exhibit excellent low-temperature resistance and crack resistance, maintaining strength and toughness under low-temperature conditions.
Material Quality Control: Ensure the selected materials meet relevant standards and specifications. Conduct chemical composition analysis, mechanical property tests, and impact tests on the materials to confirm their performance meets design requirements.
Welding Material Selection: Choose welding materials suitable for low-temperature environments, such as low-temperature welding rods or welding wires. The welding materials should match the tank material, offering good welding properties and crack resistance.
Welding Process Control: Monitor welding process parameters such as current, voltage, and welding speed to ensure the quality and reliability of weld joints. Methods with low heat input, such as pulse welding and laser welding, can reduce the temperature gradient and residual stress in the heat-affected zone.
Corrosion Prevention Measures: Apply anti-corrosion treatments to the metal surfaces both internally and externally of the storage tank to extend its service life. Anti-corrosion coatings and paints can be used to protect the tank's metal structure from corrosion.
Material Performance Monitoring: Regularly conduct performance monitoring of the storage tank materials, such as mechanical property tests,

Proper installation of the liquid oxygen tank safety valve is a crucial step in ensuring the safe operation of the liquid oxygen tank. Below are the installation steps for the liquid oxygen tank safety valve:
Select the appropriate safety valve: Choose a suitable safety valve based on the design pressure and flow requirements of the liquid oxygen storage tank. Ensure that the rated pressure and flow of the safety valve meet the tank's specifications and comply with relevant safety standards and regulations.
Valve Installation Location: Select a suitable location to install the safety valve. Typically, the safety valve should be mounted on the top or side of the liquid oxygen storage tank to allow for timely pressure release in the event of overpressure.
Ready for installation interfaces: Prepare the corresponding interfaces based on the type of connection for the safety valve. This may include welding joints, threaded joints, or flange joints, etc. Ensure the tightness of the interfaces and secure connections.
Install the safety valve: Mount the safety valve onto the prepared interface. Follow the installation instructions for the safety valve to ensure proper connection and tightness.
Adjustment and Testing: After installation, adjust and test according to the safety valve requirements. Ensure the opening and closing pressures of the safety valve meet the design specifications, and conduct a leak test to ensure sealing.
Identification and Documentation: Label the safety valve with relevant information such as rated pressure, flow rate, and installation date. Additionally, document the installation details and test results for future reference and maintenance.
When installing the liquid oxygen storage tank safety valve, it is essential to follow the relevant safety regulations and operation guidelines. If you lack the necessary experience and knowledge, it is advisable to seek assistance and guidance from a professional to ensure the correct installation and reliable operation of the safety valve.
Zhongjie Special Equipment adheres to the great vision of "realizing employees' dreams, creating customer value, and striving for the prosperity and strength of our motherland," focusing on the development of green energy equipment industry, and devoting products and services with high cost-performance to society!