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 storage tanks, oxygen-nitrogenargon storage tanks, CO2 storage tanks; pressure vessel products like denitrification engineering equipment, heat storage and energy storage equipment, complete chemical equipment sets; central air conditioning and HVAC 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.
Consider the following aspects to distinguish the quality of liquid nitrogen storage tanks:
Material: Liquid nitrogen tanks typically are made from high-strength, corrosion-resistant materials such as stainless steel or aluminum alloy. These materials offer excellent corrosion resistance and mechanical strength, ensuring long-term stable operation of the tanks.
Sealing: The liquid nitrogen storage tank should have good sealing performance, effectively preventing the leakage of liquid nitrogen. The valves, pipe connections, and other parts of the tank should be designed reasonably to ensure reliable sealing.
Insulation: The liquid nitrogen tank should have excellent insulation properties to minimize evaporation losses. The insulation layer of the tank should use materials like polyethylene foam to reduce heat conduction and evaporation losses.
Safety: Liquid nitrogen storage tanks should have excellent safety features, including safety valves, pressure gauges, and other safety equipment, as well as fire and explosion-proof functions. The design and manufacturing of the tank should comply with relevant safety standards and regulations.
Service Life: Liquid nitrogen tanks generally have a long service life, capable of withstanding prolonged use and transportation. The manufacturer and reputation of the tank are also significant factors in evaluating the service life.
Price and After-Sales Service: The price of liquid nitrogen tanks should be reasonable, with excellent after-sales service provided. Choosing manufacturers or suppliers with a good reputation and solid after-sales service ensures the quality of the product and technical support.
Considering these factors, one can differentiate between the advantages and disadvantages of liquid nitrogen tanks. When selecting a liquid nitrogen tank, it is recommended to choose one that meets the requirements based on actual needs and usage environment to ensure safe and reliable storage of liquid nitrogen.

In 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 heat input and thermal stress. Employ low heat input welding methods, such as pulsed welding and laser welding, 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 proper post-heat treatment, such as annealing or stress-relief heat treatment, after welding to decrease 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 material 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, thereby reducing the accumulation of thermal and residual stresses.
Inspection and Evaluation: Conduct non-destructive testing on weld seams after welding, 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 various factors, such as 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.

When initially using a liquid nitrogen tank, there are some precautions to consider for safe and efficient operation. Here are some suggested points to keep in mind:
Safe Operation: Liquid nitrogen is a cryogenic liquid with strong refrigerating and asphyxiating properties. When handling liquid nitrogen tanks, appropriate personal protective equipment, such as insulated gloves and protective suits, must be worn. Avoid direct contact with liquid nitrogen to prevent injury or other harm.
Ventilation Environment: Liquid nitrogen evaporation produces a large amount of gas, which may displace other gases, leading to a decrease in oxygen content in the air. Therefore, when using liquid nitrogen tanks, it is essential to ensure proper ventilation in the operating area to prevent oxygen deficiency.
Tank Inspection: Prior to the initial use of the liquid nitrogen tank, thoroughly inspect its appearance and seal integrity. Ensure there are no obvious damages, leaks, or other safety hazards. If any issues are found, they should be promptly repaired or the tank replaced.
Tank Filling: Prior to the initial use of the liquid nitrogen tank, it is necessary to fill it with liquid nitrogen. During the filling process, follow the correct operational steps and safety protocols to ensure the procedure is safe and reliable. Additionally, pay attention to controlling the filling speed and pressure to prevent excessive tank pressure and temperature increase.
Labeling and Record Keeping: Prior to the first use of the liquid nitrogen tank, relevant information should be labeled on the tank, such as the stored medium, capacity, manufacturing date, etc. It is also recommended to establish a usage record for the tank, including filling dates, filling quantities, and usage details, for future tracking and management.
Note that the use of liquid nitrogen tanks involves safety risks such as low temperatures and high pressures. Operators should receive training and strictly adhere to the relevant operational procedures and safety measures. If you are unfamiliar with the operation or have doubts, it is recommended to consult experts or relevant organizations for guidance.

Safe operation of low-temperature liquid storage tanks is primarily key in the following aspects:
Tank Design and Material Selection: The tank design must comply with relevant safety standards and regulations, capable of withstanding the pressure and temperature of low-temperature liquids. Select suitable materials, such as stainless steel and aluminum alloys, to ensure the tank's corrosion resistance and low-temperature performance.
Insulation and Protection Measures: Low-temperature liquid storage tanks should be equipped with effective insulation to minimize heat transfer and evaporation of the liquid. The selection and installation of the insulation should comply with relevant standards and requirements. Additionally, protective measures such as anti-freezing and explosion-proof measures should be implemented to ensure the safe operation of the tank.
Pressure Control and Safety Valves: Low-temperature liquid storage tanks should be equipped with reliable pressure control systems and safety valves to ensure the pressure inside the tank remains within a safe range. The pressure control system should be capable of promptly detecting and adjusting the pressure inside the tank to prevent safety risks caused by excessive or insufficient pressure.
Leak and Fire Protection: Low-temperature liquids are highly flammable, so measures should be taken to prevent leaks and fires. Storage tanks and related pipelines should have good sealing properties and be regularly inspected and maintained to prevent leaks. Additionally, appropriate fire protection facilities and firefighting equipment should be provided to address fire risks.
Safe Operation and Training: Operators must undergo relevant safety training to understand the safety operating procedures and emergency response measures for low-temperature liquid storage tanks. Adhere to correct operational steps to ensure safe operation.
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Our company attaches great importance to technological innovation and R&D design. We have one municipal-level enterprise technology center in Heze City, equipped with testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc. We have over 600 types of 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 and 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 innovative and excellent projects. We have accumulated 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 of Shandong University, has developed deep cryogenic container processing technology using the internationally recognized plasma arc + filler wire tungsten inert gas (PAW-GTAW) welding technology. The provincial-level scientific and technological achievement identification has confirmed that our technology level in deep cryogenic container manufacturing has reached an international standard. Choose Zhongjie Special Equipment, and let's create brilliance together!