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 Department 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.
Liquid nitrogen tanks feature the following characteristics during the construction process:
Low Temperature Construction: The construction of liquid nitrogen tanks must be carried out in a low-temperature environment, as the boiling point of liquid nitrogen is low, approximately -196 degrees Celsius. Construction personnel must take appropriate protective measures, such as wearing insulated clothing and gloves, to protect themselves from low-temperature injuries.
Welding Technology: Extensive welding is required during the manufacturing process of liquid nitrogen tanks, including the bonding of wall panels, bottom plates, top plates, and seams. Welding technology is crucial for the quality and safety of the tank, necessitating the use of appropriate welding methods and materials to ensure the strength and sealing integrity of the welds.
Insulation Layer Installation: Liquid nitrogen tanks must have excellent insulation properties to reduce heat conduction and maintain low temperatures. The installation of the insulation layer requires materials such as polyester foam and glass wool, ensuring the thickness and quality of the insulation.
Proper installation steps for a liquid nitrogen tank are as follows:
Site Preparation: Select an appropriate site for tank installation, ensuring it is level, sturdy, and capable of supporting the necessary load. The site should be kept away from flammable, explosive materials, and other hazardous sources.
Basic Construction: Construction of the foundation based on the tank's dimensions and weight, including excavation of the foundation pit and casting concrete foundation. The design and construction of the foundation should comply with relevant standards and specifications.
Tank Installation: Transport the tank to the site and perform vertical installation. Appropriate lifting equipment and safety measures are required during the installation process to ensure the stability and safety of the tank.
Pipe Connections: Connect the storage tank to the relevant pipeline system as required, including intake pipes, exhaust pipes, and liquid supply pipes, etc. Sealing and testing must be conducted during the connection process to ensure the safety of the pipes.

The standard specifications for liquid oxygen storage tanks may vary by region. Here are examples of some common standards: U.S. Standards: The American National Standards Institute (ANSI) and the American Petroleum Institute (API) have issued a series of standards for liquid oxygen storage tanks, such as ANSI/API Standard 2510 "Design and Construction of Liquid Oxygen Tanks" and ANSI/API Standard 2510A "Supplementary Standard for Design and Construction of Liquid Oxygen Tanks." European Standards: The European Committee for Standardization (CEN) has issued a series of standards for liquid oxygen storage tanks, including EN 13458 "Design and Manufacture of Liquid Oxygen Tanks" and EN 14015 "Design and Manufacture of Vertical Welded Steel Fixed Tanks." Chinese Standards: The Standardization Administration of the People's Republic of China (SAC) has issued a series of standards for liquid oxygen storage tanks, such as GB/T 18442 "Design Code for Liquid Oxygen Tanks" and GB/T 18443 "Construction and Acceptance Code for Liquid Oxygen Tanks." These standards typically cover requirements for the design, manufacture, installation, operation, maintenance, and inspection of liquid oxygen storage tanks. They encompass provisions related to the tank's structure, materials, safety valves, insulation, leak control, fire prevention measures, and safety distances to ensure the safety and reliability of the tanks. When designing, manufacturing, and using liquid oxygen storage tanks, it is essential to follow applicable standards and regulations and cooperate with local regulatory authorities and individuals to ensure the tanks meet relevant safety requirements and regulations.

Nitrogen purge in liquid nitrogen tanks refers to the process of injecting nitrogen gas into the tank to increase the concentration and pressure of nitrogen inside, in order to meet certain safety requirements and operational objectives. Here are some precautions to consider when performing nitrogen purge in liquid nitrogen tanks:
Safety Operation: Prior to conducting nitrogen flushing on a liquid nitrogen tank, it is mandatory to ensure that the operators possess relevant safety knowledge and operational skills. Operators should wear appropriate personal protective equipment, such as safety goggles, gloves, and protective clothing.
Nitrogen Quality: Utilize high-purity nitrogen for inerting operations to ensure the quality and purity of the nitrogen. Low-purity nitrogen may contain impurities or oxygen, which could adversely affect the liquid nitrogen within the storage tank.
Nitrogen Inerting Speed Control: During the nitrogen inerting process, the inerting speed should be controlled to avoid being too fast or too slow. A too fast inerting speed may lead to excessive internal pressure within the tank, whereas a too slow inerting speed may result in extended inerting time.
Pressure Monitoring: During the nitrogen filling process, regular monitoring of the internal pressure of the storage tank is required. Ensure that the internal pressure of the tank remains within a safe range and adjust as necessary.
Temperature Control: During the nitrogen flushing process, attention should be given to controlling the temperature of the storage tank. The low temperature of liquid nitrogen can lead to condensation and frost formation on the storage tank and pipelines. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and frost formation.
Post-nitrogen flushing treatment: After the nitrogen flushing operation is completed, the flushing device should be promptly shut off, and the tank should be inspected and cleaned. Ensure that there is no residual nitrogen or impurities inside the tank.
Note: Nitrogen charging for liquid nitrogen storage tanks must be strictly adhered to the relevant safety standards.

Liquid oxygen storage tanks are widely used in various industries, primarily in the following aspects:
Industry: Liquid Oxygen Tanks are widely used in various fields for storing and supplying liquid oxygen as fuel and oxidizer. Liquid Oxygen Tanks play a crucial role in engine, propulsion systems, and oxygen supply systems.
Chemical Industry: Liquid oxygen storage tanks are used in chemical processes for storing and supplying liquid oxygen, employed in oxidation reactions, combustion reactions, and oxygen supply, etc. Chemical plants, oil refineries, and chemical manufacturers may all utilize liquid oxygen storage tanks.
Industry: Liquid Oxygen Tanks are used in the field for storing and supplying liquid oxygen, utilized for oxygen therapy, respiratory support, and surgeries. Liquid Oxygen Tanks are widely used in hospitals, clinics, and nursing facilities, among other institutions.
Experimental Research: Liquid oxygen tanks are used in scientific research and laboratories to provide liquid oxygen as experimental materials and fuel. Liquid oxygen tanks play a crucial role in experimental research across various fields, including physics, chemistry, biology, and materials science.
Metalworking Industry: Liquid oxygen tanks are used in the metalworking and welding industries to supply high-purity oxygen for processes such as metal cutting, welding, and heat treatment.
Other Industries: Liquid oxygen storage tanks are also applied in other industries, such as the energy, environmental protection, and food industries, etc. They are used in energy production, environmental management, and food processing fields.
Note that the use of liquid oxygen tanks must strictly adhere to relevant safety regulations and operational guidelines to ensure safe operation and usage of the tanks.
Shandong Zhongjie Special Equipment, welcome customers to our factory for business negotiations.