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/Class, GC2/Class pressure pipeline installation licenses, as well as equipment and machinery installation contracting qualifications. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the council member of the Shandong Equipment Manufacturing Association. The company has also passed certifications for the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System, and the American ASME/U2 certification.
The reasons for not leaving a liquid oxygen tank empty for long periods are mainly as follows:
Evaporation Loss of Liquid Oxygen: Due to its low boiling point, liquid oxygen will continuously evaporate when left unused for long periods, resulting in a loss of liquid oxygen within the storage tank. The evaporation rate of liquid oxygen is rapid, with daily evaporation amounts potentially reaching several percent of the tank's capacity. Prolonged unused storage can lead to waste of liquid oxygen.
Safety Risk: Liquid oxygen is a strong oxidizer with high flammability and explosive properties. Prolonged empty storage of liquid oxygen tanks increases the likelihood of contact with the surrounding environment, thereby raising the risk of accidental fires and explosions.
Risk of Storage Tank Damage: Long-term storage of liquid oxygen in a tank can lead to internal oxidation reactions, accelerating corrosion and damage to the tank. Tank damage can affect its sealing performance and structural strength, increasing the risk of leaks and safety accidents.
Therefore, to ensure the safe storage and effective use of liquid oxygen, the liquid oxygen tank should be regularly maintained and serviced to avoid long-term empty storage. When the tank is not in use, appropriate measures should be taken, such as sealing the tank and reducing oxygen evaporation, to minimize losses and safety risks of liquid oxygen.

Liquid Argon Storage Tanks are equipment used for storing and transporting liquid argon. Their application scope and characteristics are as follows:
Application Scope:
Industrial Applications: Liquid argon storage tanks are widely used in various industrial sectors, such as metal processing, electronic manufacturing, semiconductor production, and more.
Application: Liquid argon tanks are used in the field for cryogenic preservation of biological samples, cells, tissues, and vaccines.
Laboratory Applications: Liquid argon tanks are used in scientific research laboratories for low-temperature experiments, cryopreservation, and sample processing, etc.
Features:
Low-temperature Performance: As liquid argon has a boiling point of -185.7°C, the liquid argon storage tank must have excellent low-temperature insulation properties to maintain the低温 state of the liquid argon.
High-sealing property: Liquid argon storage tanks must have good sealing performance to prevent evaporation loss of liquid argon and the entry of external air.
Safety: Liquid argon is a flammable and explosive substance, hence the liquid argon tank must be equipped with safety valves, leak detectors, and other safety devices to ensure the safe operation of the tank.
High Capacity: The capacity of liquid argon storage tanks ranges from a few liters to several thousand liters, allowing for selection of an appropriate capacity based on requirements.
Cautionary Notes:
Protective Gear: When handling liquid argon tanks, it is mandatory to wear appropriate protective gear, including gloves, protective clothing, and non-slip shoes, to safeguard against the low temperatures of liquid argon and other hazards.
Ventilation Requirements: Please specify

Liquid nitrogen tanks are equipment used for storing and transporting liquid nitrogen. To ensure safe operation, here are some common safety guidelines for the use of liquid nitrogen tanks:
Tank Installation: Tanks should be installed on a solid and level foundation, away from fire sources and flammable materials. Good ventilation around the tank is essential to prevent gas accumulation. The tank should maintain a safe distance from other equipment and buildings.
Liquid Nitrogen Filling: When filling with liquid nitrogen, use appropriate liquid nitrogen transfer equipment to avoid direct contact. During the filling process, monitor and control the flow and pressure of liquid nitrogen to prevent over-filling and excessive tank pressure.
Tank Pressure Control: Tanks should be equipped with pressure control devices to ensure the internal pressure remains within safe limits. Regularly inspect and maintain these devices to ensure proper operation.
Leak Detection and Alarm Systems: Tanks should be equipped with leak detection and alarm systems to promptly identify and alert of any tank leaks. Regularly inspect and maintain the leak detection equipment to ensure proper functioning.
Fire and Explosion Prevention Measures: A fire-resistant isolation zone should be established around the storage tank, keeping it away from fire sources and flammable materials. The tank itself should adopt fire and explosion prevention measures, such as fire-resistant coatings and explosion-proof devices, to prevent fires and explosions.
Regular Inspections and Maintenance: Conduct regular inspections of the tank's exterior, valves, and fittings to ensure they are undamaged. Perform regular leak detection and pressure tests to ensure the tank's safety performance meets requirements.
Safety Training and Awareness Enhancement: Conduct safety training for operators to enhance their awareness and ability to handle liquid nitrogen tanks safely. Regularly hold safety training and drills to respond to emergencies.
Establish comprehensive management records and documents, including tank usage, inspection, and maintenance records. Regularly review and update these records to ensure safe management and maintenance of the tanks.
It's important to note that the above are common protective procedures, but specific procedures may vary depending on the type of tank and application. When using liquid nitrogen tanks, operate according to relevant specifications and standards, and consult with experts to ensure safety and effectiveness.

Standard specifications for liquid oxygen storage tanks may vary by region. Below are examples of some common standards: U.S. Standards: The American National Standards Institute (ANSI) and the American Petroleum Institute (API) have issued a series of standards for liquid oxygen storage tanks, such as ANSI/API Standard 2510 "Design and Construction of Liquid Oxygen Storage Tanks" and ANSI/API Standard 2510A "Supplementary Design and Construction of Liquid Oxygen Storage Tanks." European Standards: The European Committee for Standardization (CEN) has issued a series of standards for liquid oxygen storage tanks, including EN 13458 "Design and Construction of Liquid Oxygen Storage Tanks" and EN 14015 "Design and Construction of Vertical Welded Steel Fixed Storage Tanks." Chinese Standards: The China National Committee for Certification and Accreditation (SAC) has issued a series of standards for liquid oxygen storage tanks, such as GB/T 18442 "Design Code for Liquid Oxygen Storage Tanks" and GB/T 18443 "Construction and Acceptance Code for Liquid Oxygen Storage Tanks." These standards typically include requirements for design, manufacturing, installation, operation, maintenance, and inspection of liquid oxygen storage tanks. They cover provisions for the tank's structure, materials, safety valves, insulation, leak control, fire protection measures, and safety distances to ensure the safety and reliability of the tanks. When designing, manufacturing, and using liquid oxygen storage tanks, applicable standards and specifications should be followed, and cooperation with local regulatory authorities and personnel should be sought to ensure compliance with relevant safety requirements and regulations.
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