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 license, GB2 and GC2 class pressure pipeline installation licenses, and 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 director 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.
Nitrogen charging in liquid nitrogen tanks refers to the process of injecting nitrogen 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:
Safe Operation: Prior to nitrogen charging operations on liquid nitrogen tanks, it is mandatory to ensure 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 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 Inerting Speed Control: During the nitrogen inerting process, the speed of nitrogen inerting should be controlled to avoid being too fast or too slow. Excessive speed in inerting can lead to overly high internal pressure in the tank, whereas a slow speed can result in prolonged inerting time.
Pressure Monitoring: During the nitrogen charging process, the internal pressure of the tank should be monitored regularly. Ensure the internal pressure of the tank remains within the safe range and adjust as necessary.
Temperature Control: During the nitrogen purge process, it is crucial to monitor and 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 formation.
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: Nitrogen purging operations for liquid nitrogen tanks must strictly adhere to the relevant safety standards.

The use of liquid oxygen storage tanks requires special attention to the following safety matters:
Training: Personnel handling liquid oxygen tanks must undergo training to understand the properties of liquid oxygen, safety operating procedures, and emergency response measures. Only trained personnel are authorized to operate liquid oxygen tanks.
Safety Operating Procedures: Establish and adhere to the safety operating procedures for liquid oxygen tanks, including proper operational procedures, protective measures, and emergency response plans. Ensure operators follow the procedures to minimize accident risks.
Protective Measures: When using liquid oxygen tanks, it is mandatory to take necessary protective measures, such as wearing protective gloves and suits. Avoid direct contact with liquid oxygen to prevent frostbite.
Leak Control: Conduct regular inspections of liquid oxygen storage tanks for leaks and equip with leak detectors and alarm systems. In the event of a leak, take immediate action to contain it and proceed with repairs.
Fire Prevention Measures: Liquid oxygen has a high oxygen content, which can easily cause fires. To prevent and contain fires, firewalls and fire-resistant coatings are installed around the liquid oxygen storage tanks.
Static protection: Electrostatic buildup in liquid oxygen tanks may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment are taken to reduce the accumulation and release of static electricity.
Ventilation Requirements: Ensure adequate ventilation within the enclosed space of the liquid oxygen storage tank to expel vapors produced by the evaporation of liquid oxygen.

Potential causes of leakage in liquid argon storage tanks may include:
Design or Manufacturing Defects: Defects in the design or manufacturing process of the tank, such as loose welds, improper material selection, or inadequate sealing, lead to leakage issues in the tank.
Corrosion and oxidation: Long-term exposure of liquid argon tanks to low temperatures can lead to corrosion and oxidation. These processes can damage the tank's surface protective layer, causing leakage issues.
Fatigue and stress cracking: During long-term use, tanks may experience fatigue and stress cracking due to temperature and pressure fluctuations. These cracks can degrade the tank's sealing performance, leading to leaks.
Improper Operation: Failure to operate the storage tank according to specifications, such as overfilling liquid argon or excessive pressure, can lead to tank damage and leakage.
External Damage: The tank may have sustained damage from external factors, such as mechanical impacts or objects

Liquified Oxygen低温 Storage Tanks are primarily used for storing and supplying liquid oxygen. The application methods can vary depending on specific needs and scenarios. Here are some common applications of liquid oxygen storage tanks:
Applications: Liquid oxygen low-temperature storage tanks are widely used in the field for cryogenic preservation of biological samples, cells, tissues, and vaccines. Institutions such as biopharmaceutical research organizations and biobanks utilize these tanks to store and protect these biological materials.
Experimental Research: Liquid Oxygen Low-Temperature Storage Tanks are used in scientific research and laboratories to provide low-temperature environments for freezing preservation and experiments. These tanks play a crucial role in experimental research across various fields, including physics, chemistry, biology, and materials science.
Industrial Applications: Liquid Oxygen Low-Temperature Storage Tanks are used in industrial fields to provide low-temperature cooling for processes such as metalworking, welding, and heat treatment. These tanks can achieve low temperatures, enabling metals to reach the desired hardness and toughness during processing.
Food Industry: Liquid Oxygen Low-Temperature Storage Tanks are used in the food industry for freezing and refrigerating foods such as frozen meats, frozen fruits, and frozen seafood. The low temperature of liquid oxygen can quickly freeze the food, preserving its freshness and quality.
Liquid oxygen low-temperature storage tanks are used in the field for storing and supplying liquid oxygen as fuel. As a high-energy fuel, liquid oxygen is widely used in the propulsion systems of engines and devices.
During the operation of liquid oxygen low-temperature storage tanks, it is crucial to strictly adhere to relevant safety regulations and operational guidelines to ensure the safe operation and use of the tanks. Liquid oxygen is highly flammable, so fire prevention measures must be taken when using liquid oxygen low-temperature storage tanks, and it must be ensured that there are no sources of fire nearby.
Our company attaches great importance to technological innovation and R&D design. We have one municipal-level enterprise technology center in Heze City, equipped with testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc. We have over 600 types of equipment, including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, and more. The key products we have developed, such as temperature and pressure vessel welding, biomass boiler emission reduction, and waste heat utilization, have successively been included in multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have accumulated 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. Our technical team, in collaboration with Professor Yajiang Li from Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + filler wire tungsten inert gas arc welding (PAW-GTAW) technology. The provincial-level scientific and technological achievement identification has confirmed that our technology level in deep cryogenic container manufacturing has reached an international standard. Choose Zhongjie Special Equipment, and let's create brilliance together!