Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Development Zone, Heze City, with a registered capital of 50 million yuan and total assets of 500 million yuan. The company has 7 business centers: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters, with the main workshop spanning 83,000 square meters. It currently employs 710 people, including 247 engineers and technicians, and 82 intermediate-level technicians. In December 2016, it was recognized as a "High-tech Enterprise" by the Science and Technology Department. In June 2021, it was identified as a "Specialized and New Enterprise in Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, it was identified as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Maintenance and upkeep are crucial for ensuring the safety of low-temperature storage tanks. Here are some common maintenance measures:
Regular Inspections: Conduct regular checks on low-temperature storage tanks, including inspections of the exterior, internal structure, and corrosion-resistant coating. Check for cracks, corrosion, wear, and other issues, and identify and repair potential safety hazards in a timely manner.
Cleaning and De-icing: Regularly clean the exterior surface and internal structure of the low-temperature storage tank to remove accumulated dirt and ice layers. The buildup of ice can lead to structural damage and corrosion; cleaning and de-icing can extend the lifespan of the tank.
Level Monitoring: Regularly monitor the liquid level in low-temperature storage tanks to ensure it remains within the safe range. Excessive or low levels can lead to overpressure or over-vacuum in the tank, increasing safety risks.
Leak Detection: Install a leak detection system to regularly check for any leakage in low-temperature storage tanks. Leaks can cause liquid or gas spillage and evaporation, increasing safety risks.
Corrosion Protection Measures: Implement appropriate corrosion protection measures, such as coating protection and corrosion-resistant coatings, to safeguard the metal structure of low-temperature storage tanks from corrosion damage.
Emergency Fault Handling: Establish an emergency fault handling mechanism to promptly address and repair issues with low-temperature storage tanks to prevent accidents from occurring or escalating.
Training and Development of Personnel: Train and develop operational and maintenance staff to ensure they possess relevant knowledge and skills for the correct operation and maintenance of low-temperature storage tanks.
Be mindful that maintenance and upkeep should be tailored to the specific type of tank and operating conditions, adhering to relevant local regulations, standards, and specifications. During maintenance, it is advisable to consult with an engineer or seek guidance from relevant institutions to ensure the tank's safety and reliability.

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 bending radius of the container and the bendability of the material.
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 interacts 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 vessel's strength, corrosion resistance, and safety. During the design process, it is necessary to reasonably select and calculate these thickness parameters, in accordance with relevant standards and regulations, considering the vessel's usage conditions and requirements, to ensure the design and manufacture meet the specified requirements.

Liquid nitrogen tanks are equipment used for storing liquid nitrogen and are widely used in the following fields: Frozen Food and Cold Chain Logistics: Liquid nitrogen tanks are used in the frozen food and cold chain logistics industry to freeze or refrigerate food and other perishable items, extending their shelf life and maintaining freshness. The low temperature of liquid nitrogen can quickly freeze food, preventing bacterial growth and spoilage. Biological Sample Storage: Liquid nitrogen tanks are extensively used in the field for freezing and preserving biological samples, cells, tissues, and more. The low temperature of liquid nitrogen effectively preserves the integrity and viability of biological materials, used in medical research, biomedical engineering, and transplantation fields. Laboratory Research: Liquid nitrogen tanks are used in scientific research and laboratories to provide liquid nitrogen as a coolant and freezing medium. The low temperature of liquid nitrogen can be used for cooling laboratory equipment, material research, superconducting electronics, and low-temperature physics. Metalworking and Welding: Liquid nitrogen tanks are used in metalworking and welding for cooling and controlling the temperature of metals. Liquid nitrogen can rapidly cool metals, improving their hardness and strength, and reducing deformation and stress. Gas Storage and Supply: Liquid nitrogen tanks are also used for storing and supplying nitrogen gas. Liquid nitrogen can be evaporated into gaseous nitrogen for applications such as gas shielded welding, gas fire suppression systems, gas analysis, and laboratory gas supply. In summary, liquid nitrogen tanks are widely applied in the fields of frozen food, laboratory research, metalworking, and gas supply, providing storage and supply functions for liquid nitrogen at application sites.

Determining the design pressure and calculated pressure of a liquid oxygen storage tank requires considering the following factors:
Design Pressure: Design pressure refers to the maximum pressure a tank can withstand under normal operating conditions. When determining the design pressure, factors such as the working pressure range of liquid oxygen, the material strength of the tank, and the safety factor must be considered. Generally, the design pressure should be slightly higher than the high working pressure of liquid oxygen to ensure the tank's safety and reliability within the normal operating range.
Calculation Pressure: The calculation pressure refers to the actual working pressure of the tank under the design pressure. It is determined by calculating factors such as the characteristics of liquid oxygen, the geometric shape of the tank, and the material strength. The calculation pressure should take into account factors like the expansion coefficient of liquid oxygen, temperature changes, and pressure fluctuations to ensure the safety and stability of the tank under actual operating conditions.
Determining the design pressure and calculation pressure of liquid oxygen storage tanks usually requires adherence to relevant standards and specifications, such as Standard GB150 for "Steel Pressure Vessels" and GB18442 for "Technical Conditions of Liquid Oxygen, Liquid Nitrogen, and Liquid Argon Storage Tanks." These standards and specifications provide detailed design and calculation methods to ensure the safety and reliability of the tanks.
In practical application, the design and calculated pressures of the liquid oxygen storage tank should be calculated and determined by the pressure vessel designer. They will consider factors such as specific engineering requirements, tank dimensions, and materials, among others, to ensure the tank's design and use comply with relevant safety standards and regulations.
Our company attaches great importance to technological innovation and R&D, boasting 1 city-level 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, equipped with over 600 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. Our key products and technologies such as welding of temperature and pressure vessels, biomass boiler emissions 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 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 Li Yajiang of Shandong University, has developed deep cryogenic container processing technology using the internationally recognized plasma arc + wire filling argon arc welding (PAW-GTAW) technology. After provincial-level scientific and technological achievement appraisal, the technology level has reached an international standard in the field of deep cryogenic container manufacturing. Choose Zhongjietong, and let's create brilliance together!