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.
Liquid nitrogen storage tanks feature the following characteristics during construction:
Low-Temperature Construction: The construction of liquid nitrogen tanks must be carried out in low-temperature conditions, as the boiling point of liquid nitrogen is low, approximately -196 degrees Celsius. Construction personnel must take appropriate protective measures, such as wearing thermal protective clothing and gloves, to protect themselves from low-temperature injuries.
Welding Technology: A substantial amount of welding is required during the manufacturing process of liquid nitrogen tanks, including the joining of tank walls, 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 sealability of the welds.
Insulation Layer Construction: Liquid nitrogen storage tanks must have excellent insulation properties to minimize heat conduction and maintain the low temperature of liquid nitrogen. The construction of the insulation layer requires materials such as polyester foam and glass wool, ensuring the thickness and quality of the insulation layer.
Proper installation steps for liquid nitrogen tanks are as follows:
Site Preparation: Select a suitable site for tank installation, ensuring it is level, sturdy, and has adequate load-bearing capacity. The site should be kept away from flammable, explosive materials, and other hazardous sources.
Foundation Construction: Construction of the foundation is based on the tank's dimensions and weight, including excavation of the foundation pit and pouring concrete. The design and construction of the foundation must comply with relevant standards and regulations.
Tank Installation: Transport the tank to the site and perform a vertical installation. Appropriate lifting equipment and safety measures must be used during the installation process to ensure the stability and safety of the tank.
Pipe Connections: As required, connect the tank with the relevant pipeline system, including intake pipes, exhaust pipes, and liquid supply pipes, etc. Sealing and testing must be carried out during the connection process to ensure the pipeline's safety.

Carbon dioxide and liquid oxygen tanks are containers used for storing different gases, and they have some differences in their physical properties:
Physical State: Carbon dioxide is a gas at room temperature and pressure, and it must be at low temperatures and high pressures to become liquid. Liquid oxygen is a liquid at room temperature and solidifies at lower temperatures.
Boiling and freezing points: The boiling point of carbon dioxide is -78.5 degrees Celsius, with a freezing point at -56.6 degrees Celsius. The boiling point of liquid oxygen is -183 degrees Celsius, and its freezing point is -218.8 degrees Celsius. The boiling and freezing points of liquid oxygen are significantly lower than those of carbon dioxide.
Density: Liquid oxygen has a higher density, approximately 1.14 grams per cubic centimeter. Carbon dioxide has a lower density, around 0.00198 grams per cubic centimeter. The density of liquid oxygen is about 570 times that of carbon dioxide.
Pressure: Liquid oxygen has a high pressure, typically ranging from tens to hundreds of MPa (megapascals). Carbon dioxide has a lower pressure, usually within a few MPa (megapascals).
Safety: Liquid oxygen contains a high oxygen concentration, which is easily flammable and explosive. Carbon dioxide also poses asphyxiation and suffocation risks at certain concentrations.
Note that carbon dioxide and liquid oxygen are highly flammable and explosive substances. Strict adherence to relevant safety operation procedures and standards, along with necessary safety measures, is required to ensure the tank's safety and stability during storage and use.

When using a 50-cubic-liter liquid oxygen tank, the following safety concerns should be noted:
Tank Pressure Control: Ensure the liquid oxygen pressure within the tank is consistently within the safe range. Monitor and control the tank's pressure to avoid risks from excessive or insufficient pressure.
Leakage and Fire Prevention: Regularly inspect the tank and associated pipelines for seal integrity to prevent liquid oxygen leakage. Liquid oxygen is highly flammable and fire prevention measures must be taken to ensure there are no ignition sources around the tank.
Explosion Prevention Measures: Oxygen inside the liquid oxygen tank can potentially cause an explosion upon contact with flammable materials. Ensure there are no flammable items around the tank and implement explosion prevention measures, such as explosion-proof electrical equipment and static grounding.
Safety valves and exhaust systems: Tanks should be equipped with safety valves and exhaust systems to prevent overpressure conditions. Ensure the proper operation of the safety valves and the unobstructed flow of the exhaust system.
Routine Maintenance and Inspection: Regularly maintain and inspect the storage tanks, including cleaning, coating protection, and anti-corrosion treatment. Ensure the structural integrity and safety of the tanks.
Safety Operation and Training: Operators must undergo relevant safety training, familiarize themselves with the safe operation procedures for liquid oxygen tanks, and understand emergency response measures. Adhere to correct operational steps to ensure safe operation.
Environmental Monitoring: Regularly monitor environmental parameters such as oxygen concentration and temperature around the storage tanks to ensure safety.
Emergency Preparedness: Develop an emergency response plan, including measures for leaks, fires, and explosions. Equip with appropriate emergency equipment and firefighting gear to handle unforeseen incidents.
Above are some safety issues to be aware of when using a 50-cubic-liter liquid oxygen tank. To ensure safety, it is recommended to follow relevant safety regulations and operational guidelines, and seek assistance and guidance from professionals when necessary.

When storing liquid nitrogen in low-temperature storage tanks, be mindful of the following points:
Protective Gear: When operating low-temperature storage tanks, it is mandatory to wear appropriate protective gear, including gloves, protective clothing, and non-slip shoes. This equipment safeguards the skin from the low temperatures of liquid nitrogen and other hazards.
Avoid direct contact: Liquid nitrogen is extremely cold and can cause chilling. Therefore, avoid direct contact with liquid nitrogen, especially with the skin. Use tools or utensils for handling to prevent direct hand contact with liquid nitrogen.
Ventilation Requirements: In the operational area of low-temperature storage tanks, adequate ventilation must be maintained to expel gases produced by the evaporation of liquid nitrogen. Ensure air circulation to avoid excessive oxygen concentration, reducing the risk of fire and explosion.
Prevent Leaks: Regularly inspect low-temperature storage tanks for leaks, equip with leak detection and alarm systems. In case of a leak, take immediate measures to control and repair it. Avoid the hazards of liquid nitrogen leaks to personnel and the environment.
Fire Prevention Measures: Liquid nitrogen has a low boiling and freezing point, which can easily cause fires. Measures such as installing firewalls around low-temperature storage tanks and using fire-retardant coatings are taken to prevent the occurrence and spread of fires.
Static protection: Electrostatic buildup in low-temperature tanks can cause sparks, increasing the risk of fire. Measures such as using conductive materials and anti-static equipment are taken to reduce the accumulation and release of static electricity.
Regular inspections and maintenance: Conduct regular checks on the condition of low-temperature storage tanks and related equipment, including valves, pipelines, pressure gauges, etc. Ensure the equipment is in perfect condition and promptly repair or replace any damaged parts.
Waste Gas Treatment: Low-temperature storage tanks generate waste gas during operation, and appropriate waste gas treatment measures must be taken to minimize environmental impact.
Above are the precautions to be taken when storing liquid nitrogen in a low-temperature storage tank, ensuring safe operation and normal function of the tank. During operation, strictly follow the relevant operational procedures and safety requirements to avoid accidents.
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