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 Changjiang Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop spanning 83,000 square meters. The company currently employs 710 staff, including 247 engineers and technicians and 82 middle-level technicians. It was recognized as a "High-tech Enterprise" by the Science and Technology Department in December 2016, named a "Shandong Specialized and New Enterprise" by the Ministry of Industry and Information Technology in June 2021, as a "Shandong Gazelle Enterprise" in June 2022, and as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology in August 2022.
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, facilitating the conversion of oxygen into a liquid state.
The boiling point of liquid oxygen is -183°C, and at room temperature, oxygen exists as a gas. Liquid oxygen tanks require cooling the oxygen below its boiling point to convert it into a liquid for storage and supply.
The pre-cooling process typically involves the following steps:
Clean Storage Tank: It is necessary to clean the tank first to ensure there are no impurities or contaminants inside, to avoid affecting liquid oxygen.
Drainage and Exhaust: To empty the gas inside the tank and expel it through the exhaust system to reduce the gas content within the tank.
Add Liquid Nitrogen: Inject liquid nitrogen into the tank, which can rapidly cool the air and walls inside the tank due to its low temperature, thereby reducing the tank's temperature.
Waiting for cooling: The liquid nitrogen inside the tank will gradually lower the temperature of the tank through the heat conduction process until it reaches 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 protecting the accessories of liquid argon storage tanks is a crucial measure for ensuring their proper operation and extending their service life. The following are general methods for the maintenance and protection of liquid argon storage tank accessories:
Valve Maintenance: Regularly inspect and maintain valves in the tank accessories, including intake valves, exhaust valves, safety valves, etc. Ensure the valves operate smoothly and reliably with no leaks or sticking. Regularly lubricate the valves and clean any debris and dirt on them.
Pressure Relief Device Maintenance: The pressure relief devices (such as safety valves) in the liquid argon storage tank accessories are critical components for ensuring the safety of internal tank pressure. Regularly inspect and test the operational status of the pressure relief devices to ensure proper functioning. Clean and repair as necessary.
Sensor and gauge maintenance: Sensors and gauges in the liquid argon storage tank accessories are used to monitor and control parameters such as tank temperature and pressure. Regularly calibrate and inspect the accuracy and reliability of the sensors and gauges. Keep sensors and gauges clean and in proper working order.
Insulation Protection: The insulation layer of liquid argon storage tank accessories is crucial for maintaining the low temperature of liquid argon. Regularly inspect the integrity and insulating performance of the insulation layer, repair or replace damaged insulation materials. Avoid mechanical damage or contamination to the insulation layer.
Cleaning and Corrosion Protection: Regularly clean the accessories of the storage tank, removing impurities and dirt from the surface. Periodically inspect and maintain the corrosion-resistant coating on the accessories to prevent corrosion and oxidation.
Regular inspections and maintenance: Conduct comprehensive inspections and maintenance of liquid argon cylinder accessories on a regular basis, including the exterior, fittings, and seals. Promptly detect and address any damages, leaks, or other issues with the accessories.
Record and Document Management: Document each maintenance and service result, including the service date, content, issues found, and measures taken. Establish comprehensive management records and documents for tracking and managing the operation of the attachments.
Note that maintenance and protection of liquid argon cylinder accessories should be carried out by trained personnel, following relevant specifications and standards. Ensure safety during maintenance and operation, and consult experts for accurate guidance.

Liquid nitrogen storage tanks feature the following characteristics during the construction process:
Low Temperature Construction: The construction of liquid nitrogen tanks must be carried out in low-temperature environments due to the low boiling point of liquid nitrogen, approximately -196 degrees Celsius. Construction personnel must take appropriate protective measures, such as wearing thermal protective clothing and gloves, to safeguard themselves against low-temperature injuries.
Welding Technology: A substantial amount of welding is required during the manufacturing process of liquid nitrogen tanks, including the connections of the tank walls, bottom plate, top plate, and welds. Welding technology is crucial for the quality and safety of the tanks, necessitating the use of appropriate welding methods and materials to ensure the strength and sealability of the welds.
Insulation Layer Construction: Liquid nitrogen tanks must have excellent insulation properties to reduce heat conduction and retain低温, maintaining the low temperature state 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 an appropriate site for tank installation, ensuring it is level, sturdy, and has adequate load-bearing capacity. The site should be located away from flammable, explosive materials, and other hazardous sources.
Foundation Construction: Construction of the foundation based on the tank's dimensions and weight, including excavation of the foundation pit, pouring concrete foundation, etc. The design and construction of the foundation should comply with relevant standards and specifications.
Tank Installation: Transport the tank to the site and install it vertically. Appropriate lifting equipment and safety measures must be used during installation 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.

When selecting the supports for liquid argon tanks, consider the following factors:
Load Capacity: The support must be capable of bearing the weight of the liquid argon tank. Select a support with adequate load capacity based on the tank's capacity and dimensions. Typically, the weight of the liquid argon tank is specified in the design specifications, and these data can be used to determine the support's load-bearing capacity.
Stability: The support must provide sufficient stability to prevent the tank from tilting or rocking during operation. The design of the support should consider the tank's center of gravity and its changes to ensure stable support.
Corrosion Resistance: Liquid argon has low temperature and corrosive properties; the support material should have good corrosion resistance to prevent corrosion and damage. Common support materials include stainless steel, aluminum alloy, etc.
Insulation: Liquid argon storage tanks generally require thermal insulation. The supports should have certain insulation properties to reduce heat transfer and evaporation of liquid argon. The design of the supports should consider the installation and protection of the insulation layer.
Installation and Maintenance: The supports should be designed for ease of installation and maintenance, facilitating the tank's installation and routine maintenance tasks.
When selecting the support bases for liquid argon tanks, it's advisable to consult with engineers or suppliers. Choose the appropriate bases based on the specific tank requirements and usage environment. At the same time, adhere to relevant design specifications and safety standards to ensure the quality and reliability of the bases.
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