Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, A2-grade pressure vessel manufacturing license, A2-grade pressure vessel design license, B-grade boiler installation and GB2, GC2 pressure pipeline installation licenses, as well as a mechanical and electrical equipment installation contracting license. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and a council member of the Shandong Equipment Manufacturing Association. The company has also passed ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System certifications, and the American ASME/U2 certification.
Low-temperature liquid storage tanks are equipment designed for storing low-temperature liquids, commonly used for liquid oxygen, liquid nitrogen, liquid argon, and other low-temperature liquids. These liquids exist in a gaseous state at room temperature but are cooled to a liquid state under low temperatures for easier storage and use. The tanks are typically made of high-strength materials like stainless steel or aluminum alloy to withstand low temperatures and high pressures. They often feature an insulating layer inside to minimize evaporation and maintain the low-temperature condition. Applications of low-temperature liquid storage tanks include but are not limited to the following areas: They are widely used in rocket and spacecraft fuel and propulsion systems, such as liquid oxygen, liquid nitrogen, and liquid hydrogen tanks, for storing and supplying low-temperature liquids as fuel and oxidizers to propel the vehicles. Industrial Production: Low-temperature liquid storage tanks are employed in industrial production to store and supply liquids like liquid oxygen, nitrogen, and argon. These are used as coolants, for gas separation, and as raw materials for chemical reactions in industrial processes. Medical Applications: These tanks are used in the medical field to store and supply liquid oxygen for oxygen therapy, inhalation therapy, and operating rooms. Laboratory Research: In scientific research and laboratories, low-temperature liquid storage tanks provide low-temperature liquids as coolants and cryogenic media. They are used for cooling laboratory equipment, material research, superconductivity, and low-temperature physics. In summary, low-temperature liquid storage tanks are widely used in various fields, including aerospace, industrial production, and laboratory research, for storing and supplying low-temperature liquids to meet the needs of different sectors.

Liquid nitrogen storage tanks feature the following characteristics during construction:
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 thermal protective clothing and gloves, to safeguard against low-temperature injuries.
Welding Technology: Extensive 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 seams.
Insulation Layer Construction: Liquid nitrogen storage tanks must have excellent insulation properties to reduce heat conduction and maintain 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 a liquid nitrogen tank are as follows:
Site Preparation: Select a suitable site for tank installation, ensuring it is level, sturdy, and capable of adequate load-bearing capacity. The site should be kept 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 and pouring of 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 Connection: Connect the tank to the relevant pipeline system as required, including intake pipes, exhaust pipes, and liquid supply pipes, etc. Sealing and testing are necessary during the connection process to ensure the safety and integrity of the pipes.

The leak treatment methods for liquid argon storage tanks mainly include the following steps:
Identified Air Leaks: Detected through odors, gas detection equipment, or abnormal pressure in liquid argon storage tanks, air leaks in the liquid argon storage tanks are identified.
Confirm air leak location: Use gas detection instruments or foam leak detection agents, etc., to pinpoint the exact location of the air leak. Inspect tank interfaces, valves, pipe connections, and other areas to locate the air leak.
Cease Air Leaks: Take appropriate measures to stop the air leak source based on the leak location. For instance, for leaks at joints, inspect and adjust sealing washers or tighten bolts; for valve leaks, check and replace seals.
Isolate Wind-Leak Areas: During the process of handling wind leaks, it is necessary to isolate wind-leak areas to ensure personnel safety. Set up warning signs, restrict access to the area, and take necessary protective measures, such as wearing protective masks, gloves, etc.
Empty liquid argon: If the leakage cannot be repaired immediately or the leakage is substantial, consider emptying the liquid argon. By gradually reducing the pressure of liquid argon in the storage tank, it can be converted to gas, minimizing the risk of leakage.
Ventilation Treatment: During the air leakage treatment, ensure adequate ventilation and promptly exhaust the gases produced by the evaporation of liquid argon. Natural ventilation or the use of ventilation equipment can be employed to expel the evaporated gas of liquid argon outdoors.
Safety Assessment and Repair: After the air leakage treatment is completed, conduct a safety assessment to ensure the tank's safety. Based on the assessment results, carry out the necessary repairs and maintenance to prevent the recurrence of air leakage.
Note that liquid argon is a low-temperature liquid with a low boiling and freezing point. Caution is required when dealing with leaks to prevent contact that could cause chilling. When handling leaks in a liquid argon storage tank, the operation should be carried out by personnel, following relevant safety operation procedures and standards.

When storing liquid nitrogen in low-temperature storage tanks, please 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 frostbite. Therefore, it's crucial to avoid direct contact with liquid nitrogen, especially with the skin. Use tools or equipment for handling, and never touch liquid nitrogen with your hands.
Ventilation Requirements: In the operational area of low-temperature storage tanks, proper ventilation must be maintained to exhaust gases produced by the evaporation of liquid nitrogen. Ensure good air circulation to avoid high oxygen concentration, reducing the risk of fire and explosion.
Prevent Leaks: Regularly inspect low-temperature storage tanks for leaks and equip with leak detection and alarm systems. In case of a leak, take immediate action to control the leak and carry out repairs. Avoid harm to personnel and the environment from liquid nitrogen leaks.
Fire prevention measures: Liquid nitrogen has a low boiling and freezing point, which is prone to fire. Measures such as setting up fire barriers around low-temperature storage tanks and using fire-retardant coatings are taken to prevent fires from occurring and spreading.
Static protection: The accumulation of static electricity in low-temperature tanks may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment should be 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 without any damage, and promptly repair or replace any damaged parts.
Waste Gas Treatment: Low-temperature storage tanks produce waste gas during operation, which necessitates appropriate waste gas treatment measures to minimize environmental impact.
Above are the precautions to be taken when storing liquid nitrogen in a low-temperature storage tank, ensuring operational safety and the normal operation of the tank. During the operation, strictly follow the relevant operational procedures and safety operation requirements to avoid accidents.
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