Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, an A2-grade pressure vessel manufacturing license, an A2-grade pressure vessel design license, a B-grade boiler installation license, and GB2/Class and GC2/Class pressure pipeline installation licenses, as well as an electromechanical equipment installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the理事 unit of the Shandong Equipment Manufacturing Association. The company has also passed the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System certifications, and the American ASME/U2 certification.
Proper management regulations for the use of low-temperature liquid storage tanks include the following aspects:
Tank selection and installation: Choose an appropriate low-temperature liquid storage tank and ensure it complies with relevant standards and regulations. Installation of the tank should be carried out by personnel, following the manufacturer's instructions and requirements, to ensure stability and safety.
Safety Operating Procedures: Establish and implement safety operating procedures for liquid storage tanks, including start-up, shutdown, filling, and venting procedures. Operators must receive training to understand the characteristics of liquid storage tanks, safety precautions, and emergency response measures.
Safety Equipment and Protective Measures: Tanks should be equipped with necessary safety devices such as pressure sensors, safety valves, leak detectors, etc., to monitor and control the pressure and temperature of the tank. At the same time, operators should wear appropriate personal protective equipment like insulating gloves, protective suits, etc., to ensure their safety.
Regular Inspections and Maintenance: Conduct regular checks and maintenance on low-temperature liquid storage tanks, including examining the tank's appearance, seals, and corrosion protection measures. In case of any issues, promptly repair or replace the tank to ensure its proper operation and safety.
Waste Management: Abandoned low-temperature liquid storage tanks should be disposed of in accordance with relevant environmental protection regulations. The residual liquids in the abandoned tanks should be handled properly to prevent environmental pollution.
Tank Records and Tracking: Establish tank usage records, including filling dates, quantities, and usage status. Additionally, it is recommended to set up a tank tracking system for monitoring and managing tank usage and maintenance.
Here are some common management regulations for low-temperature liquid storage tanks. Specific regulations may vary by industry and region. When using low-temperature liquid storage tanks, relevant laws and standards should be adhered to, and appropriate management measures should be established based on the actual situation.

Nitrogen flushing in liquid nitrogen storage tanks refers to the process of injecting nitrogen into the tank to increase the concentration and pressure of nitrogen inside, in order to meet certain safety requirements and operational objectives. Here are some precautions to consider when performing nitrogen flushing in liquid nitrogen storage tanks:
Safety Operation: Prior to performing nitrogen purge operations on a liquid nitrogen tank, it is mandatory that operators possess relevant safety knowledge and skills. Operators should wear appropriate personal protective equipment, such as safety goggles, gloves, and protective clothing.
Nitrogen Quality: Utilize high-purity nitrogen for purging operations to ensure the quality and purity of the nitrogen. Low-purity nitrogen may contain impurities or oxygen, which could negatively affect the liquid nitrogen within the storage tank.
Nitrogen Charging Speed Control: During the nitrogen charging process, the speed should be controlled to avoid being too fast or too slow. Too fast a charging speed can lead to excessive internal pressure within the storage tank, while too slow a charging speed may result in an extended charging time.
Pressure Monitoring: During the nitrogen filling process, regular monitoring of the internal pressure of the storage tank is required. Ensure the internal pressure of the tank is within the safe range and adjust as necessary.
Temperature Control: During the nitrogen charging process, it is crucial to control the temperature of the storage tank. The low temperature of liquid nitrogen can lead to condensation and dew on the tank and pipelines. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and dew.
Post-nitrogen flushing treatment: After the nitrogen flushing operation is completed, the flushing unit should be promptly turned off, and the tank should be inspected and cleaned. Ensure that there is no residual nitrogen or impurities inside the tank.
Note that nitrogen purge operations for liquid nitrogen tanks must strictly adhere to the relevant safety standards.

The advantages of using liquid nitrogen storage tanks in flash-freezing technology include:
Rapid Freezing Speed: The temperature of liquid nitrogen is low, approximately -196 degrees Celsius. Using a liquid nitrogen tank for rapid freezing can quickly lower the surface temperature of food, achieving rapid freezing. Compared to traditional freezing methods, liquid nitrogen rapid freezing can significantly reduce freezing time while preserving the quality and texture of the food.
Uniformly Frozen Effect: The liquid nitrogen rapid freezing technology achieves fast and even freezing of food. Liquid nitrogen is喷射ed onto the food surface in a gaseous form, rapidly absorbing heat and turning into a liquid, thereby ensuring even freezing of the food, avoiding crystallization and lumping during the freezing process.
Maintain Food Quality: Quick-freezing with liquid nitrogen rapidly chills food, minimizing crystallization and clumping during the freezing process, thereby preserving the quality and texture of the food. During the quick-freezing process, liquid nitrogen quickly lowers the surface temperature of the food, forming tiny frozen structures, effectively retaining its moisture and nutritional content.
Flexibility and Adaptability: The liquid nitrogen tank can be adjusted and controlled according to different food types and freezing requirements. It can modify the injection speed and angle of liquid nitrogen based on the size, shape, and freezing needs of the food to achieve optimal freezing results.
Environmental protection and energy-saving: Liquid nitrogen rapid freezing technology, compared to traditional freezing methods, can save more energy and resources. Liquid nitrogen evaporates quickly during the freezing process, causing environmental pollution, as well as generating waste water and gas.
Note that when using liquid nitrogen tanks for rapid freezing, it is essential to adhere to the relevant safety operation procedures and guidelines. Ensure that the operators possess the necessary safety awareness and operational skills to prevent accidental incidents. Additionally, consult

Leakage defects in liquid argon storage tanks may be caused by the following reasons:
Design or Manufacturing Defects: Defects in the design or manufacturing process of the tank, such as poor welding, inappropriate material selection, or inadequate sealing, result in leakage issues with the tank.
Corrosion and Oxidation: Long-term exposure to low temperatures can cause corrosion and oxidation in liquid argon tanks. These issues can damage the tank's surface protective layer, leading to leakage problems.
Fatigue and stress cracking: Over time, due to temperature and pressure fluctuations during prolonged use, tanks may experience fatigue and stress cracking. These cracks can reduce the tank's sealing performance, leading to leaks.
Improper Operation: Failure to operate the tank according to specifications, such as overfilling with liquid argon or excessive pressure, can lead to tank damage and leakage.
External Damage: The tank may sustain damage from external factors such as mechanical impacts or objects.
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