Shandong Zhongjie Special Equipment's main products include: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG tanks, oxygen-nitrogenargon tanks, and CO2 tanks; pressure vessel products such as denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment; central air conditioning and ventilation equipment such as ground (water) source heat pumps, air source units, water-cooled screw units, and air-cooled modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
Liquid oxygen storage tanks offer the following advantages:
High Storage Density: Liquid oxygen tanks store oxygen in its liquid form, offering a higher storage density compared to gas storage. This means more oxygen can be stored in a limited space, providing extended supply times.
High Purity Oxygen Supply: Liquid oxygen tanks provide high purity oxygen supply. After refrigeration and purification processes, liquid oxygen can achieve high purity, meeting the requirements of applications in fields such as industry and scientific research.
Easy to Use: The liquid oxygen tank is designed for convenience and ease of use. The tank features a level gauge and a pressure gauge, among other equipment, for easy monitoring of liquid level and pressure. Additionally, the tank is equipped with safety devices such as pressure relief valves and level alarms, ensuring safe operation and use.
Long-Term Storage: Liquid oxygen tanks are suitable for long-term storage of oxygen. The low-temperature properties of liquid oxygen can slow down the evaporation and oxidation of oxygen, thereby extending its storage life. This is beneficial for applications requiring long-term oxygen storage, such as institutions, laboratories, and industrial production.
Overall, liquid oxygen tanks offer advantages such as high storage density, pure oxygen supply, ease of use, and long-term storage. This makes liquid oxygen tanks a reliable choice for oxygen supply, widely used in industrial and research fields.

Liquid oxygen storage tanks are high-pressure, highly oxidizing equipment that require special attention to safety during use. Here are some safety precautions for liquid oxygen storage tanks: Operation: The operation of liquid oxygen storage tanks should be carried out by trained and experienced personnel. Operators should be familiar with the tank's structure, performance, and operational procedures, and should operate strictly according to the operation manual and safety regulations. Fire Prevention Measures: Liquid oxygen is highly oxidizing and can easily cause fires and explosions. Open flames and hot objects should be prohibited around liquid oxygen storage tanks to prevent sparks and contact with the tank. Fire protection equipment and fire extinguishers should be established and regularly inspected and maintained. Leakage Control: In the event of a leakage in a liquid oxygen storage tank, immediate measures should be taken to control the leakage. Leaks can cause the evaporation of liquid oxygen and an increase in oxygen concentration, which can increase the risk of fire and explosion. A leakage alarm system should be established, and leakage control devices and personal protective equipment should be provided. Insulation Protection: Liquid oxygen storage tanks should have good insulation protection to reduce evaporation of liquid oxygen and maintain a low temperature state. The insulation layer should be regularly inspected and maintained to ensure its integrity and insulation performance. Safety Distance: A certain safety distance should be maintained around liquid oxygen storage tanks to prevent the spread of fires, explosions, and leaks. The specific requirements for safety distance should be assessed and determined according to local regulations and standards. Regular Inspection and Maintenance: Liquid oxygen storage tanks should be regularly inspected and maintained, including checking the structural integrity of the tank, valves, and pipelines.

During the welding process of low-temperature liquid storage tanks, controlling the occurrence of welding cracks is crucial. The following are some methods and measures for controlling welding cracks:
Appropriate Welding Techniques: Select the appropriate welding process and parameters to minimize welding heat input and thermal stress. Employ low heat input welding methods, such as pulsed welding, laser welding, etc., to reduce the temperature gradient and residual stress in the heat-affected zone.
Preheating and post-heat treatment: Perform appropriate preheating before welding to enhance material toughness and reduce thermal stress. Conduct a suitable post-heat treatment, such as annealing or stress-relieving heat treatment, after welding to minimize residual stress and improve the toughness of the weld.
Select appropriate welding materials: Choose welding materials with good toughness and crack resistance to minimize the occurrence of welding cracks. Select the appropriate welding materials based on the storage tank's operating conditions and requirements, such as low-alloy steel, stainless steel, etc.
Control Welding Process: Regulate parameters and operations during the welding process to minimize the risk of welding cracks. Pay attention to factors such as welding speed, current, voltage, and welding sequence to avoid overheating or rapid welding, reducing the accumulation of thermal and residual stresses.
Inspection and Evaluation: After welding is completed, conduct non-destructive testing on the welds, such as ultrasonic testing, X-ray testing, etc., to assess welding quality and the presence of cracks. Promptly detect and repair welding cracks to ensure the integrity and safety of the weld joints.
It's important to note that controlling welding cracks is a complex process that requires considering multiple factors, including materials, welding techniques, and operations. When welding low-temperature liquid storage tanks, it's advisable to consult with a welding engineer or relevant institutions for guidance to ensure welding quality and the safety of the tank.

Liquid Oxygen Stations are facilities used for storing and supplying liquid oxygen, with liquid oxygen tanks being a crucial component of these stations. Liquid oxygen tanks possess several important functions and characteristics:
Liquid Oxygen Storage: Liquid oxygen tanks are primarily used for storing liquid oxygen, cooling gaseous oxygen below its critical temperature to convert it into a liquid form. The storage density of liquid oxygen is high, allowing for the storage of large amounts of oxygen in relatively small spaces.
Maintain Low Temperature: Liquid oxygen tanks are typically designed with a double-layer structure, separated by a vacuum layer between the inner and outer layers to reduce heat conduction and maintain low temperatures. This helps keep the liquid oxygen at a低温 state, preventing premature vaporization.
Safety Design: Liquid oxygen tanks must be designed and manufactured with safety in mind. They are typically made of high-strength materials such as stainless steel or aluminum alloy to withstand high pressure and low-temperature requirements. Additionally, liquid oxygen tanks are equipped with safety valves, pressure sensors, and temperature sensors to ensure that the internal pressure and temperature of the tank remain within safe limits.
Supply System Connection: Liquid oxygen tanks are typically connected to the supply system to transport liquid oxygen to the required locations. The supply system includes liquid oxygen pumps, pipes, valves, and other equipment for extracting liquid oxygen from the tank and delivering it to the user's end.
Liquid oxygen tanks play a crucial role in storing and maintaining liquid oxygen in liquid oxygen stations. Their design and operation must strictly adhere to relevant safety regulations and procedures to ensure the safety and reliability of the storage and supply process.
Our company places great emphasis on technological innovation and research and development, boasting 1 municipal enterprise technology center in Heze City. We have established testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and more. We are equipped with over 600 various 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 others. The key products and technologies we have developed, such as welding of temperature-pressure vessels, emissions reduction in biomass boilers, and waste heat utilization, have successively been shortlisted for multiple Shandong Provincial Department of Industry and Information Technology Science and Technology Innovation Projects, key projects in Shandong Province, and Heze City Innovation and Excellence Projects. We have cumulatively obtained 27 authorized utility model patents, 16 authorized invention patents, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. The technical team of our company, in collaboration with Professor Yajiang Li from Shandong University, has developed deep cryogenic vessel processing technology using the internationally recognized plasma arc + filler wire argon arc welding (PAW-GTAW) technique. After being appraised as a provincial-level scientific and technological achievement, our technology level has reached an international standard in the field of deep cryogenic vessel manufacturing. Choose Zhongjie Special Equipment, let's create brilliance together!