Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Economic and Technological 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 Yangtze Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop spanning 83,000 square meters. It currently employs 710 staff, 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, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
The oxygen-filling process for liquid oxygen tanks must adhere to specific operational procedures and safety measures. Here are the steps for filling liquid oxygen tanks:
Preparation: Ensure the tanks and oxygenation equipment are in good working condition, check the tank's sealing and the normal operation of the safety valve.
Connect equipment: Attach the oxygenation equipment to the storage tank, ensuring a reliable seal at the connection point.
Prepare liquid oxygen: Transfer liquid oxygen from the storage container to the storage tank of the oxygen-filling equipment. During the transfer, be cautious to avoid any leakage or contact with the liquid oxygen.
Oxygen Filling Operation: Open the valve of the oxygen filling equipment and fill liquid oxygen into the storage tank from the oxygen storage cylinder. During the filling process, control the filling speed and pressure to prevent excessive pressure and temperature increase in the tank.
Monitoring and Control: During the aeration process, it is necessary to monitor the tank's pressure and temperature to ensure they remain within safe limits. In case of any anomalies, the aeration process should be halted immediately and appropriate measures should be taken.
Oxygen Filling Complete: Close the valve of the oxygen filling equipment and stop the oxygen filling operation once the tank reaches the required oxygen level or pressure.
Safety Handling: After oxygenation is complete, safety handling is required, including closing relevant valves and emptying any remaining liquid oxygen from the oxygenation equipment.
Note that liquid oxygen is highly oxidizing and flammable; the oxygen-filling process must strictly adhere to relevant safety operation procedures and standards. Operators should receive training and strictly follow the operational procedures and safety measures to ensure the safety and reliability of the oxygen-filling process.

Low-temperature liquid storage tanks (such as liquid nitrogen, liquid oxygen, liquid argon, etc.) offer several advantages:
High-Density Storage: Low-temperature liquid storage tanks can convert gases into liquids, significantly increasing storage density. Compared to gas storage, liquid storage can hold more material in a relatively smaller space, enhancing storage efficiency.
Low-Temperature Retention: The low-temperature liquid storage tank features excellent insulation properties, effectively maintaining the low-temperature state of the liquid. The design and construction of the insulation layer reduce heat conduction and thermal loss, preserving the low temperature of the liquid and minimizing evaporation and loss.
Supply: Low-temperature liquid storage tanks provide a stable and consistent liquid supply. Through internal pressure control and pipeline system design, precise liquid supply is achievable, catering to industrial production and experimental needs.
Safety: Low-temperature liquid storage tanks offer a high level of safety. Compared to gas storage, liquid storage reduces the risk of gas leakage and explosion. Tanks are typically equipped with safety devices such as pressure relief valves and level alarms to ensure timely action can be taken in abnormal situations, protecting the tank's safety.
Multi-functional Applications: Low-temperature liquid storage tanks are widely used in various fields, such as industrial production and scientific research. Low-temperature liquids like liquid nitrogen and liquid oxygen can be utilized for freezing, refrigeration, and gas supply, meeting diverse industrial needs.
In summary, low-temperature liquid storage tanks offer advantages such as high-density storage, temperature retention, supply, safety, and versatile applications, providing reliable liquid storage and supply solutions for various industries.

Determining the design pressure and calculated pressure for a liquid oxygen 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 safety factors need to 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.
Calculated Pressure: The calculated pressure refers to the actual working pressure of the tank under the design pressure. It is determined by calculating factors such as the properties of liquid oxygen, the geometric shape of the tank, and the material strength. The calculated 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 typically 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 liquid oxygen storage tanks should be calculated and determined by pressure vessel designers. They will take into account specific engineering requirements, tank dimensions, materials, and other factors to ensure that the tank's design and use comply with relevant safety standards and regulations.

To ensure the quality of liquid oxygen storage tanks, the following measures can be taken:
选择可靠的供应商：选择有资质和经验的储罐制造商或供应商，确保其具备良好的声誉和可靠的质量管理体系。
Adhere strictly to relevant standards and specifications: The design, manufacturing, and installation of liquid oxygen tanks shall comply with applicable standards and specifications, such as standards, industry standards, or.
Quality Control and Inspection: Rigorous quality control and inspection are conducted throughout the manufacturing process, including raw material inspection, process monitoring, and finished product testing. Ensuring that the materials, welding, and sealing of the tanks meet the required standards.
A comprehensive quality management system: Establish and implement a comprehensive quality management system, including quality control plans, quality inspection records, and quality training, to ensure each stage meets quality requirements.
Regular maintenance and inspections: Regular maintenance and inspections of the liquid oxygen storage tank are conducted, including cleaning, coating protection, and corrosion prevention, to extend the tank's service life and maintain its optimal working condition.
Safety Operations and Management: Establish and implement safety operations and management systems, including proper use of tanks, operational procedures, and safety training, to ensure the safety and reliability of tanks during use.
Regular inspections and evaluations: Conduct regular inspections and evaluations of liquid oxygen tanks, including visual inspections, pressure tests, leak detection, and as required, non-destructive testing and material analysis, to ensure the quality and safety of the tanks.
By implementing these measures, the quality of liquid oxygen tanks can be effectively ensured, enhancing their reliability and safety, and meeting usage requirements and standards.
Our company highly values technological innovation and R&D, boasting one municipal-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 developed technologies for temperature and pressure vessel welding, biomass boiler emission reduction, and waste heat recovery have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, Shandong key projects, and Heze City innovation and excellence projects. We have accumulated 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. The technical team, in collaboration with Professor Li Yajiang of Shandong University, has developed deep cryogenic vessel processing technology using the internationally recognized plasma arc + filler wire tungsten inert gas arc welding (PAW-GTAW) technology. The provincial-level scientific and technological achievement appraisal has determined that our technology level in deep cryogenic vessel manufacturing has reached an international standard. Choose Zhongjie Special Equipment, let's create brilliance together!