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 a qualification for electromechanical equipment installation contracting. 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.
Nitrogen charging in liquid nitrogen tanks refers to the process of injecting nitrogen gas into the tank to increase the nitrogen concentration and pressure inside, in order to meet certain safety requirements and operational objectives. Here are some precautions to consider when nitrogen charging liquid nitrogen tanks:
Safety Operation: Prior to conducting nitrogen charging operations on liquid nitrogen tanks, it is mandatory to ensure that the operators possess relevant safety knowledge and operational skills. Operators should wear appropriate personal protective equipment, such as safety goggles, gloves, and protective clothing.
Nitrogen Quality: Utilize high-purity nitrogen for inerting operations to ensure the quality and purity of the nitrogen. Low-purity nitrogen may contain impurities or oxygen, which could adversely affect the liquid nitrogen within the storage tank.
Nitrogen flushing speed control: During the nitrogen flushing process, the flushing speed should be controlled to avoid being too fast or too slow. Too fast of a flushing speed may cause excessive internal pressure in the storage tank, while too slow of a flushing speed may result in extended flushing time.
Pressure Monitoring: During the nitrogen charging process, regular monitoring of the internal pressure changes within the storage tank is required. Ensure that the internal pressure of the tank remains within the safe range and adjust as necessary.
Temperature Control: During the nitrogen purge process, attention should be given to controlling the tank's temperature. The low temperature of liquid nitrogen can lead to condensation and frost on the tank and pipelines. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and frost.
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 there is no residual nitrogen or impurities inside the tank.
Note that the nitrogen purge operation for liquid nitrogen tanks must be strictly adhered to the relevant safety standards.

Proper management regulations for the use of low-temperature liquid storage tanks encompass the following aspects:
Tank Selection and Installation: Choose a suitable low-temperature liquid storage tank and ensure it complies with relevant standards and regulations. Installation should be carried out by personnel, following the manufacturer's instructions and requirements to ensure the tank's stability and safety.
Safety Operating Procedures: Establish and implement safety operating procedures for liquid storage tanks, including start-up, shutdown, filling, venting, and other operational steps. Operators must undergo 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, and leak detectors, to monitor and control the pressure and temperature of the tank. Additionally, operators should wear appropriate personal protective equipment, like insulating gloves and protective suits, to ensure their safety.
Regular Inspections and Maintenance: Conduct regular inspections and maintenance on low-temperature liquid storage tanks, including checking the tank's appearance, sealing, and corrosion prevention measures. In case of any issues, promptly repair or replace the tank to ensure its proper operation and safety.
Waste Disposal: 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, filling quantities, usage status, etc. Additionally, it is recommended to set up a tank tracking system for monitoring and managing the usage and maintenance of tanks.
The above outlines 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, it is essential to comply with relevant laws and standards and develop appropriate management measures based on actual conditions.

The testing and maintenance operations for liquid oxygen storage tanks encompass the following aspects:
Visual Inspection: Regularly inspect the liquid oxygen storage tank for any signs of corrosion, wear, or leakage on the tank surface to ensure the tank's exterior is intact.
Pressure Testing: Regularly conduct pressure tests on liquid oxygen tanks to verify their pressure resistance. The tests should be carried out in accordance with relevant standards and regulations to ensure the tanks can withstand the designed working pressure.
Leak Detection: Regularly conduct leak detection on liquid oxygen tanks, including using leak detection equipment to inspect the tanks, to ensure their sealing performance is good and there are no leak issues.
Cleaning and Coating Protection: Regularly clean and coat the liquid oxygen storage tank to prevent corrosion and oxidation. Use appropriate cleaning agents during cleaning and avoid substances that react with liquid oxygen. Corrosion-resistant coatings or protective coatings can be applied for coating protection.
Regular Maintenance: Conduct regular maintenance on liquid oxygen tanks, including inspections and replacements of seals, valves, safety devices, etc., to ensure normal operation and safety.
Safety Training and Operating Procedures: Conduct safety training for personnel using liquid oxygen tanks to ensure they are familiar with the safe operating procedures and precautions, preventing operational errors and accidents.
Record and Document Management: Establish test and maintenance records for liquid oxygen storage tanks, including test results, maintenance logs, and inspection records, for traceability and management purposes.
Note that the testing and maintenance of liquid oxygen tanks should be conducted by trained personnel, following relevant safety operation procedures and standards. Additionally, a specific testing and maintenance plan should be developed based on the tank's condition and usage requirements, and executed as scheduled.

Liquid nitrogen tanks are widely used in meat freezing. The following are several main applications of liquid nitrogen tanks in meat freezing:
Quick Freezing: Liquid nitrogen tanks can provide low temperatures to rapidly freeze meat to the desired temperature. Due to the low-temperature properties of liquid nitrogen, meat temperatures can be quickly reduced in a short period, effectively preserving the quality and texture of the meat.
Chilled Storage: Liquid nitrogen tanks are suitable for long-term frozen storage of meat products. Placing meat in a liquid nitrogen tank helps maintain low temperatures, preventing the growth of bacteria and microorganisms, thereby extending the shelf life of the meat.
Chilled Transportation: Liquid nitrogen tanks are suitable for the frozen transportation of meat products. Placing meat in a liquid nitrogen tank maintains its低温 state, ensuring the quality and freshness of the meat throughout the transportation process.
Chilling Processing: Liquid nitrogen tanks can be used for meat chilling. By exposing meat to liquid nitrogen, the surface can be rapidly frozen, forming a frost layer, thereby preserving the meat's moisture and nutritional content.
Chilled Processing: Liquid nitrogen tanks are suitable for meat freezing processing. Placing meat in liquid nitrogen makes it harder and crispier, facilitating cutting, slicing, and processing.
It's important to note that when using liquid nitrogen tanks for meat freezing, you should adhere to the relevant safety operating procedures and guidelines. Ensure that operators have the necessary safety awareness and operational skills to prevent accidents. Additionally, consult the food safety regulations.
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