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-nitrogen-argon storage tanks, CO2 storage tanks; pressure vessel products such as denitrification engineering equipment, heat storage and energy storage equipment, 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.
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: Cut sheets 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: The formed sheets are welded together to create the structural shape of the head and cylinder. Common welding methods include manual arc welding, gas shielded welding, or laser welding, among others.
Weld Seam Treatment: Process the weld seams after welding, such as grinding, polishing, or applying anti-corrosion coatings, to enhance the quality and appearance of the seams.
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, radiographic testing, or liquid penetrant testing, etc.
Reinforcement and Support: As required, processing and installation of reinforcement and support on the heads and cylinders to enhance the structural strength and stability.
Surface Treatment: The heads and cylinders are subject to surface treatment, such as coating with anti-corrosion paint, hot-dip galvanizing, or polishing, to enhance their corrosion resistance and aesthetic quality.
It's important to note that the manufacturing process for low-temperature storage tanks must comply with relevant standards and regulations to ensure quality and safety during production. Strict adherence to safety operation procedures and necessary protective measures should be taken 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 storage tanks may experience elastic deformation when subjected to external pressure or temperature changes. This deformation is typically reversible, meaning the tank will return to its original shape once the external pressure is removed or the temperature returns to normal.
Plastic Deformation: When a liquid oxygen storage tank is subjected to significant external force or pressure, it may undergo plastic deformation. This 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 changes in the tank's shape, shrinkage, or cracking.
These deformation defects may affect the structural integrity and safety of liquid oxygen storage tanks. Therefore, it is important to regularly inspect and evaluate the deformation of liquid oxygen storage tanks to ensure their normal operation and safe use. If deformation defects in the tank are found, timely repair or replacement measures should be taken to avoid further damage and safety risks.

The materials used for liquid oxygen tanks typically require excellent low-temperature resistance and corrosion resistance. Common materials for manufacturing liquid oxygen tanks include:
Stainless Steel: Stainless steel is a commonly used material for manufacturing liquid oxygen storage tanks, known for its excellent corrosion resistance and mechanical strength. Common stainless steel grades include 304 and 316.
Aluminum Alloy: Aluminum alloys are also commonly used in the manufacturing of liquid oxygen tanks, featuring low density and excellent corrosion resistance. Common aluminum alloy materials include 5083 and 6061 aluminum alloys.
Fiberglass Reinforced Plastic (FRP): FRP is a composite material made of glass fibers and resin. It boasts excellent corrosion resistance and mechanical strength, making it suitable for liquid oxygen storage tanks in special environments.
碳钢（Carbon Steel）：碳钢是一种常见的储罐制作材料，具有较高的强度和耐腐蚀性。然而，碳钢在液氧环境下容易发生氧化反应，因此需要采取防腐措施。
It's important to note that the choice of materials for liquid oxygen tanks should be determined based on specific application requirements, operating environment, and safety standards. When selecting materials, consider the properties of liquid oxygen and the design requirements of the tank to ensure safety and reliability. Additionally, manufacturers and suppliers often provide material selection advice and technical support.

In pressure vessel design, several common "thickness" parameters must be considered:
Wall Thickness: Refers to the actual thickness of the pressure vessel wall, i.e., the thickness of the container wall. The selection of wall thickness must consider factors such as the design pressure of the container, the strength of the material, and its corrosion resistance to ensure the strength and safety of the container.
Bend Allowance: The bend allowance refers to the additional thickness added to the wall thickness during the manufacturing process to ensure the strength and shape of the container's bending sections. The calculation and selection of the bend allowance must consider factors such as the container's bending radius and the material's bendability.
Corrosion Allowance: The corrosion allowance refers to the additional thickness added to the wall to counteract the corrosive effects on either the inside or outside of the container. The selection of the corrosion allowance must consider the working environment of the container and the corrosive properties of the medium it comes into contact with, to ensure the container can withstand corrosion throughout its service life.
These "thickness" parameters play a crucial role in pressure vessel design, affecting the container's strength, corrosion resistance, and safety. During the design process, it is necessary to select and calculate these thickness parameters reasonably, based on relevant standards and specifications, in conjunction with the container's usage conditions and requirements, to ensure that the design and manufacturing meet the standards.
ZJ Special Equipment adheres to the great vision of "realizing employees' dreams, creating customer value, and striving for the prosperity and strength of our motherland," and is dedicated to the development of the green energy equipment industry. We commit to society with high-quality, cost-effective products and services!