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-freezing 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.
The medical oxygen steel cylinder filling area, in addition to the liquid oxygen storage tank, includes the following components:
Oxygen Compressor: Oxygen compressors are used to compress gaseous oxygen into high-pressure oxygen. These compressors are typically made with special materials and designs to ensure safe handling and compression of oxygen.
Oxygen Purification System: The oxygen purification system is designed to remove impurities and contaminants from oxygen to ensure the purity and quality of the supplied oxygen. The purification system typically includes filters, adsorbents, and molecular sieves.
Oxygen Storage System: In addition to liquid oxygen tanks, an oxygen filling area may also include a gaseous oxygen storage system for temporary storage and supply of gaseous oxygen. The gaseous oxygen storage system typically consists of high-pressure oxygen cylinders or gas storage tanks.
Filling Equipment: Filling equipment is used to fill oxygen from liquid oxygen storage tanks or gaseous oxygen storage systems into medical oxygen steel cylinders. The filling equipment typically includes filling machines, filling pipelines, and filling control systems.
Oxygen Quality Monitoring System: The Oxygen Quality Monitoring System is used to monitor the quality and purity of oxygen being filled. Quality checks and supervision are conducted on the filled oxygen through an oxygen analyzer or other detection equipment.
Safety Facilities: The filling area should be equipped with corresponding safety facilities, such as fire alarm systems, oxygen leak detection systems, and ventilation systems, to ensure the safety and protective measures during the filling process.
It is important to note that the design and equipment configuration of a medical oxygen cylinder filling facility should comply with relevant regulations, standards, and specifications. During the filling process, strict adherence to operational procedures and safety requirements is essential to ensure the safe supply of oxygen.

The primary reason for pre-cooling a liquid oxygen tank before use is to lower the tank's internal temperature to below the boiling point of liquid oxygen, enabling the conversion of oxygen into a liquid state.
The boiling point of liquid oxygen is -183°C, and at room temperature, oxygen exists in a gaseous state. Liquid oxygen tanks require cooling the oxygen below its boiling point to convert it to a liquid, making it suitable for storage and supply.
The pre-cooling process typically involves the following steps:
Clean Storage Tank: First, the tank must be thoroughly cleaned to ensure there are no impurities or contaminants inside, to avoid affecting liquid oxygen.
Drainage and Exhaust: Empty the gas from the storage tank and expel it through the exhaust system to reduce the gas content within the tank.
Add Liquid Nitrogen: Inject liquid nitrogen into the storage tank, which will rapidly cool the air and walls inside the tank due to its low temperature, thereby reducing the tank's temperature.
Cooling off: The liquid nitrogen within the storage tank will gradually lower the temperature inside through heat conduction until it falls below the boiling point of liquid oxygen.
The purpose of pre-cooling is to ensure that the temperature inside the storage tank is low enough to meet the storage and supply requirements for liquid oxygen. Pre-cooling can reduce the evaporation and loss of liquid oxygen, while also helping to maintain the safety and stability of the tank.

Maintaining and being aware of liquid nitrogen storage tanks is crucial. Here are some key points:
Maintenance:
Regular Inspections: Conduct regular inspections of the liquid nitrogen tank's exterior, valves, pipes, and other components to ensure they are intact and undamaged. Pay special attention to check for any leaks, corrosion, or other forms of damage.
Clean Storage Tanks: Regularly clean liquid nitrogen storage tanks to remove internal dirt and deposits. Use appropriate cleaning agents and tools, and follow the cleaning procedures and safety operating protocols.
Liquid Nitrogen Refill: Refill liquid nitrogen regularly as needed. Ensure the storage tank maintains an adequate supply to meet usage requirements.
Maintain Pressure: Regularly inspect the liquid nitrogen tank's pressure to ensure it remains within the safe range. Perform pressure tests and adjustments as necessary.
Corrosion Prevention: Depending on the material of the storage tank and its operating environment, appropriate corrosion prevention measures are taken to extend the service life of the tank. For example, applying corrosion-resistant coatings, conducting regular corrosion prevention treatments, etc.
Cautionary Notes:
Safe Operation: When using liquid nitrogen tanks, strict adherence to safety operating procedures and standards is mandatory. Operators must be trained, familiar with the properties of liquid nitrogen and safety operating requirements, and be acquainted with the tank equipment and operational processes.
Protection Measures: When using liquid nitrogen tanks, necessary protection measures must be taken, such as wearing protective gloves and suits. Avoid direct contact with liquid nitrogen to prevent frostbite.
Leak Control: Regularly inspect the liquid nitrogen tanks for leaks and equip with leak detectors and alarm systems. In case of a leak, immediate measures should be taken to control the leak and proceed with repairs.
Ventilation Requirements: In enclosed spaces where liquid nitrogen tanks are used, adequate ventilation must be ensured.

Operation procedures for liquid oxygen storage tanks should be established based on the specific tank design and usage requirements. The following are some common contents of general operation procedures for liquid oxygen storage tanks: - Operator Training: Ensure that operators have received relevant training for liquid oxygen storage tanks, understanding the tank's structure, performance, operation procedures, and safety considerations. - Safety Inspections: Conduct necessary safety checks before operating liquid oxygen storage tanks, including inspecting the tank's integrity, the sealing of valves and pipes, and the condition of the insulation. - Liquid Oxygen Supply: Ensure the liquid oxygen supply system is functioning normally, including checking the status of liquid oxygen supply pipes, valves, and pressure gauges to ensure an adequate supply. - Tank Pressure Control: Monitor the pressure of the liquid oxygen storage tank to ensure it remains within a safe range. Adjust pressure valves or pressure relief devices as necessary to control the tank pressure. - Leak Control: Regularly check the tank and pipeline sealing to ensure no leaks. In the event of a leak, take immediate action to control the leak and notify relevant personnel. - Fire Prevention Measures: Prohibit open flames and prevent sparks and high-temperature objects from contacting the tank around the storage tank. Establish fire prevention facilities and fire extinguishing equipment, and check and maintain them regularly. - Safety Distance: Maintain a certain safety distance around the liquid oxygen storage tank to prevent the spread of fires, explosions, and leaks. - Maintenance and Inspection: Regularly perform maintenance and inspections on the tank, including cleaning the tank, checking the insulation, valves, and pipeline conditions, to ensure normal operation. - Waste Disposal: Properly dispose of waste generated by liquid oxygen storage tanks, including liquid oxygen residues, waste gases, and waste liquids, following relevant environmental protection regulations and regulations. Note that operation procedures for liquid oxygen storage tanks should be established based on the specific tank design and usage requirements, and should comply with applicable regulations, standards, and safety guidelines. When operating liquid oxygen storage tanks, cooperate with local regulatory agencies and individuals to ensure the safety and reliability of the tanks.
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," and is dedicated to the development of the green energy equipment industry. We offer society high-value products and services!