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 director unit 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.
The dimensions and structure of liquid oxygen storage tanks can vary depending on specific requirements and applications. Below are common sizes and structures of liquid oxygen storage tanks:
Dimensions: The size of liquid oxygen tanks is typically determined by the storage or transport capacity of liquid oxygen. Common capacities range from a few thousand to several tens of thousands of liters.
Structure: The structure of the liquid oxygen storage tank mainly includes the inner shell, outer shell, insulation layer, and supporting structure, etc.
Inner Shell: The inner shell of a liquid oxygen tank is the part designed for storing liquid oxygen, commonly made of materials like stainless steel or aluminum alloy, offering excellent corrosion resistance and sealing properties.
Shell: The shell of the liquid oxygen tank is the external structure that protects the inner lining, typically made of carbon steel or stainless steel, offering sufficient strength and corrosion resistance.
Insulation Layer: The insulation layer of the liquid oxygen storage tank is used to reduce heat conduction and loss, maintaining the low-temperature state of the liquid oxygen. Common insulation materials include polyethylene foam, glass fiber, and aerogel, etc.
Support Structure: The support structure of the liquid oxygen tank is used to support and secure the inner and outer shells of the tank. The support structure is typically made of steel, providing adequate strength and stability.
The dimensions and structural design of liquid oxygen tanks must consider the properties of liquid oxygen, storage or transportation requirements, and safety standards. When using liquid oxygen tanks, it is crucial to strictly adhere to the relevant operational specifications and safety requirements to ensure safe usage.

Protective techniques for liquid nitrogen tanks include the following:
Wear protective gear: When handling liquid nitrogen tanks, it is mandatory to wear appropriate protective gear, including gloves, protective clothing, and non-slip shoes. This gear safeguards the skin from the low temperatures of liquid nitrogen and other hazards.
Avoid direct contact: Liquid nitrogen is extremely cold and can cause frostbite. Therefore, avoid direct contact with liquid nitrogen, especially with the skin. Use tools or instruments for handling to prevent hand contact with liquid nitrogen.
Ensure good ventilation: In the operation area of the liquid nitrogen tank, it is mandatory to ensure adequate ventilation to expel gases produced by the evaporation of liquid nitrogen. Maintain air circulation to avoid excessive oxygen concentration and reduce the risk of fire and explosion.
Prevent Leaks: Regularly inspect the liquid nitrogen storage tank for leaks and equip with leak detectors and alarm systems. In case of a leak, take immediate action to contain and repair it. Avoid hazards to personnel and the environment caused by liquid nitrogen leaks.
Fire Prevention Measures: Nitrogen liquid has a low boiling and freezing point, which is prone to causing fires. To prevent and contain fires, fire walls and fire-retardant coatings should be installed around nitrogen liquid storage tanks.
Static protection: The accumulation of static electricity in liquid nitrogen tanks may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment should be taken to reduce the accumulation and release of static electricity.
Regular inspections and maintenance: Conduct regular checks on the condition of liquid nitrogen storage tanks and related equipment, including valves, pipelines, pressure gauges, etc. Ensure that the equipment is in good condition without damage, and promptly repair or replace any damaged parts.
Waste Gas Treatment: Nitrogen liquid storage tanks produce waste gas during operation, and proper waste gas treatment must be implemented.

Prior to cooling the liquid oxygen tank, the following prerequisites 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 within the tank. This helps minimize the interference of the gas on the cooling process.
Safety Precautions: Prior to cooling the liquid oxygen tank, necessary safety measures must be taken. Liquid oxygen is highly flammable and exhibits low-temperature properties. Operators should wear appropriate protective clothing, gloves, and other personal protective equipment to ensure safe handling.
Temperature Control: During the cooling process of the liquid oxygen tank, it is necessary to regulate the tank's temperature. Typically, low-temperature mediums such as liquid nitrogen are used to cool the tank, ensuring the temperature gradually decreases below the boiling point of liquid oxygen.
Insulation and Heat Retention: Liquid oxygen storage tanks are typically constructed with double or multi-layered structures, filled with insulating material in between to minimize heat transfer and evaporation of liquid oxygen. Ensure the integrity and good insulating properties of the insulation layer to enhance the cooling efficiency of the tank.
Under the aforementioned preliminary conditions, the cooling operation of the liquid oxygen tank may proceed. The cooling process must be strictly adhered to the relevant safety regulations and operational guidelines to ensure the safe operation and usage of the tank.

The filling of a low-temperature liquid nitrogen tank 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, 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 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 secure and reliable 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 level control system can be used to monitor and control the liquid level.
Slow injection: The injection of liquid nitrogen should be done slowly to prevent 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 pressure of the storage tank to ensure it remains within a safe range. Pressure gauges or pressure sensors can be used for monitoring.
Canning completed: Stop the injection of liquid nitrogen when the liquid level reaches the predetermined filling amount 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 canning process, it is necessary to follow relevant safety regulations and operational guidelines. Liquid nitrogen is highly flammable 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 properties and safety. Ensure safe operation and control during the bottling process to guarantee the safe operation of the storage tank and effective storage of the liquid nitrogen.
Our company attaches great importance to technological innovation and R&D design. We have one municipal-level enterprise technology center in Heze City, with test facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc. We are equipped with over 600 types of instruments and equipment, including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, and more. The key products we have developed, such as temperature-pressure vessel welding, biomass boiler emission reduction, and waste heat utilization, have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have accumulated a total of 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. Our technical team, in collaboration with Professor Yajiang Li from Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + filler wire tungsten inert gas arc welding (PAW-GTAW) technology. After provincial-level scientific and technological achievement evaluation, the technology level has reached international standards in the field of deep cryogenic container manufacturing. Choose Zhongjietech, and let's create brilliance together!