Shandong Zhongjie Special Equipment Co., Ltd. specializes in the following products: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat recovery boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG tanks, oxygen/nitrogen/argon tanks, and CO2 tanks; pressure vessel products including denitrification engineering equipment, heat storage and energy storage equipment, and 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.
The manufacturing process for the heads and cylinders of low-temperature storage tanks typically includes the following steps:
Material Preparation: Select suitable materials, such as low-temperature alloy steel or stainless steel, based on design requirements and specifications. Inspect and accept the materials to ensure their quality meets the standards.
Sheet cutting: Sheets are cut according to design dimensions and shapes. Common cutting methods include flame cutting, plasma cutting, or laser cutting, etc.
Bending and Shaping: Cut sheets are bent and shaped to form heads and cylindrical shapes. Common shaping methods include cold bending, hot bending, or hydraulic forming, etc.
Welding: Welds the shaped sheets together to form the structure of the head and cylinder. Common welding methods include manual arc welding, gas shielded welding, or laser welding, etc.
Weld Seam Treatment: Process the weld seams after welding, such as sanding, polishing, or applying anti-corrosion coatings, to enhance the quality and appearance of the welds.
Inspection and Acceptance: Conduct inspections and acceptances on the finished caps and cylinders to ensure their quality and compliance with design specifications. Common inspection methods include ultrasonic testing, X-ray inspection, or liquid penetrant testing, etc.
Reinforcement and Support: As required, process and install reinforcement and support on the head and cylinder to enhance the structure's strength and stability.
Surface Treatment: The heads and cylinders undergo surface treatment, such as applying anti-corrosion coatings, hot-dipped galvanizing, or polishing, to enhance their corrosion resistance and aesthetic quality.
It is important to note that the manufacturing process of low-temperature storage tanks must comply with relevant standards and regulations to ensure the quality and safety of the production process. During manufacturing, strict adherence to safety operating procedures and the implementation of necessary protective measures are required to ensure the safety of the operators.

Liquid oxygen storage tanks may deform during use. The following are common deformation defects in liquid oxygen storage tanks:
Elastic deformation: Liquid oxygen tanks may undergo elastic deformation when subjected to external pressure or temperature changes. This deformation is typically reversible, meaning the tank will return to its original shape after the external pressure is removed or the temperature returns to normal.
Plastic Deformation: When a liquid oxygen tank is subjected to significant external force or pressure, it may experience plastic deformation. This type of deformation is irreversible, and the tank cannot return to its original shape. Plastic deformation can cause changes in the tank's shape, such as indentation or warping.
Hot Deformation: Liquid oxygen storage tanks may experience hot deformation when subjected to high temperatures or temperature changes. Hot deformation can cause the tank to change shape, expand, or contract.
Cold Deformation: Liquid oxygen tanks may experience cold deformation when subjected to low temperatures or temperature changes. Cold deformation can lead to shape alterations, shrinkage, or cracking of the tank.
These deformation defects may affect the structural integrity and safety of the liquid oxygen storage tank. Therefore, it is important to regularly inspect and assess the deformation of the liquid oxygen storage tank to ensure normal operation and safe use. If deformation defects are found, prompt repair or replacement measures should be taken to avoid further damage and safety risks.

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 applications 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 maintenance and protection of liquid argon cylinder accessories are crucial for ensuring the normal operation and extending the service life of the cylinder. The following are general methods for the maintenance and protection of liquid argon cylinder accessories:
Valve Maintenance: Regularly inspect and maintain valves within the tank accessories, including intake valves, exhaust valves, and safety valves. Ensure valves operate smoothly and reliably with no leaks or obstructions. Regularly lubricate valves and clean any debris and dirt on them.
Pressure Relief Device Maintenance: The pressure relief devices (such as safety valves) in the accessories of liquid argon storage tanks are critical components for ensuring the internal pressure safety of the tank. Regularly inspect and test the operational status of the pressure relief devices to ensure proper functioning. Clean and repair as needed.
Sensor and Instrument Maintenance: Sensors and instruments in the liquid argon storage tank accessories are used to monitor and control parameters such as tank temperature and pressure. Regularly calibrate and inspect the accuracy and reliability of the sensors and instruments. Keep the sensors and instruments clean and functioning properly.
Insulation Protection: The insulation layer of liquid argon storage tank accessories is crucial for maintaining the low temperature state of liquid argon. Regularly inspect the integrity and insulating performance of the insulation layer, and repair or replace damaged insulation materials. Avoid mechanical damage or contamination to the insulation layer.
Clean and Antirust Protection: Regularly clean the accessories of the storage tank and remove impurities and dirt on the surface. Periodically inspect and maintain the antirust coating on the accessories to prevent corrosion and oxidation.
Regular inspections and maintenance: Conduct comprehensive inspections and maintenance on liquid argon cylinder accessories regularly, including appearance, fittings, and seals. Promptly detect and address any damage, leaks, or other issues with the accessories.
Record and Document Management: Record the results of each maintenance and service, including the maintenance date, content, issues found, and measures taken. Establish comprehensive management records and documents for tracking and managing the operational status of attachments.
Note that maintenance and protection of liquid argon tank accessories should be carried out by trained personnel, following relevant specifications and standards. Ensure safety during maintenance and operations, and consult experts for accurate guidance.
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