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, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Liquid nitrogen tanks are equipment used for storing liquid nitrogen and are widely used in the following fields: Frozen Food and Refrigerated Logistics: Liquid nitrogen tanks are used in the frozen food and refrigerated 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, prevent bacterial growth, and prevent food spoilage. Scientific Research and Laboratories: 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. Metal Processing and Welding: Liquid nitrogen tanks are used in metal processing and welding to cool and control the temperature of metal. Liquid nitrogen can rapidly cool metal, improve its hardness and strength, and reduce deformation and stress. Gas Storage and Supply: Liquid nitrogen tanks are also used for storing and supplying nitrogen gas. Liquid nitrogen can be converted into gaseous nitrogen through evaporation and used in applications such as gas shielded welding, gas fire suppression systems, gas analysis, and laboratory gas supply. In summary, liquid nitrogen tanks are widely used in the fields of frozen food, laboratory research, metal processing, and gas supply, providing storage and supply functions for liquid nitrogen at application sites.

The reason for occasional venting of liquid oxygen tanks is primarily to maintain the safe pressure range within the tank and to prevent excessive pressure buildup. Here are several scenarios where liquid oxygen tanks may vent occasionally:
Pressure Control: During the operation of the liquid oxygen tank, pressure within the tank changes due to evaporation of liquid oxygen and temperature variations. To maintain a safe pressure range within the tank, regular venting is required to control the tank pressure within a safe limit.
Prevent Overpressure Buildup: During oxygen filling or use, external factors or operational errors may cause the pressure inside the liquid oxygen tank to exceed the safe limit. To prevent overpressure buildup, timely venting is required to reduce the pressure inside the tank.
Prevent Gas Accumulation: Liquid oxygen tanks may contain some gas impurities, such as air and water vapor. These gases can condense into liquids or solids at the low temperatures of liquid oxygen, blocking pipes or affecting the normal operation of the tank. Regular venting can expel these impurities, maintaining the tank's cleanliness and unobstructed flow.
It is important to note that the degassing operation of liquid oxygen should be performed by trained personnel and strictly adhere to the relevant operational procedures and safety measures. During the degassing process, attention should be given to prevent leaks of liquid oxygen and contact with it, ensuring the safety and reliability of the operation.

Safety usage and transportation of liquid oxygen storage tanks should pay attention to the following points:
Safe Application Methods:
Tank Selection: Choose liquid oxygen tanks that comply with specifications and standards, ensuring their quality and safety performance.
Tank Installation: Tanks should be installed on a solid foundation to ensure stability. Additionally, good ventilation should be maintained around the tank, and it should be kept away from flammable materials and heat sources.
Seal Integrity Inspections: Regularly check the tank's sealing performance to ensure there are no leakage issues at valve and pipe connections.
Pressure Control: Tanks should be equipped with pressure gauges and safety valves, and undergo regular inspections and maintenance to ensure pressure remains within safe limits.
Fire Prevention Measures: Liquid oxygen has a high oxygen content and is highly flammable. Set up fire barriers around storage tanks, prohibit smoking and open flames, and ensure safety.
Static protection: During the transportation and use of liquid oxygen, static electricity may 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.
Shipping Precautions:
Transportation Vehicle Selection: Choose transportation vehicles that meet the requirements for liquid oxygen transport, ensuring their safety and sealing.
Loading and Unloading: During the transportation of liquid oxygen, the following loading and unloading procedures should be adopted:

The liquid oxygen storage tank possesses the following characteristics:
High Purity: The liquid oxygen tanks store high purity liquid oxygen, typically exceeding 99.5% purity. This makes liquid oxygen tanks crucial in applications requiring high purity oxygen, such as medical, aerospace, and research fields.
Low Temperature: Liquid oxygen has a boiling point of -183°C, thus the liquid oxygen tank must have excellent insulation properties to maintain its low temperature state. Tanks are typically designed with double or multi-layer structures, filled with insulating material in between to reduce heat transfer and the evaporation of liquid oxygen.
High Pressure: Liquid oxygen tanks typically need to withstand high pressure to maintain their liquid state. The design and material selection of the tank must consider the pressure requirements of liquid oxygen to ensure the tank's safety and reliability.
Flammability: Liquid oxygen is highly flammable and supports combustion. Therefore, during the design and use of liquid oxygen storage tanks, fire prevention measures must be implemented to ensure no ignition sources are present around the tank and that appropriate fire extinguishing equipment is provided.
High Density: Liquid oxygen has a higher density than gaseous oxygen, allowing liquid oxygen tanks to store more oxygen. This gives liquid oxygen tanks an advantage in applications requiring large amounts of oxygen supply, such as in the field.
Corrosiveness: Liquid oxygen possesses some degree of腐蚀性.
Zhongjie Special Equipment upholds the grand vision of "realizing employees' dreams, creating value for customers, and striving for the prosperity and strength of our motherland," focusing solely on the development of green energy equipment. We dedicate products and services with high cost-performance to society!