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, 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 member 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.
Routine inspection of liquid nitrogen storage tanks refers to regular checks and maintenance to ensure safe operation and efficient use. Here is a common introduction to the inspection of liquid nitrogen storage tanks:
Visual Inspection: Regularly inspect the exterior of the tank, including the tank body, insulation layer, valves, and pipelines, etc. Note any cracks, corrosion, wear, or other damage. Also, check that the insulation layer is intact with no damage or detachment.
Level Check: Regularly inspect the liquid nitrogen tank's level to ensure it remains within the normal range. This can be done using a level gauge or a level ruler and other equipment.
Pressure Check: Inspect the tank's pressure to ensure it is within the safe range. Pressure gauges or pressure sensors can be used for the check.
Leakage Inspection: Check for signs of liquid nitrogen leakage around the tank, such as vapor mist, frost, or freezing. If leakage is detected, take immediate action to repair it.
Valve and pipeline inspection: Verify that the valves and pipelines of the storage tank are functioning properly without any gas leaks or blockages. Ensure the tightness and unobstructed flow of the valves and pipelines.
Safety Device Inspection: Check the storage tank's safety devices, such as pressure relief valves, temperature sensors, and level alarms, to ensure they are functioning properly.
Maintenance Records: Timely document the inspection results and maintenance records of the tank, including liquid levels, pressure, insulation status, leakage conditions, etc. These records aid in monitoring the tank's operational condition and in identifying issues promptly.
It is important to note that the inspection of liquid nitrogen tanks should comply with relevant safety regulations and operational guidelines. Liquid nitrogen is highly flammable at low temperatures, so operators must wear appropriate personal protective equipment and ensure the operating environment is free of ignition sources. Regular inspections help identify issues promptly and take corrective measures, ensuring the safe and efficient operation of the tank.

During the degreasing process of high vacuum pipelines in low-temperature liquid storage tanks, the following steps can be taken:
Preparation: Ensure that the defatting equipment and tools are clean and ready for use. Check the pipeline system's connections and seals to ensure there are no leaks.
Pipe Cleaning: Utilize suitable detergents and tools to clean pipes, removing surface dirt and grease. Methods can include mechanical brushing, high-pressure water jetting, or chemical cleaning.
De-greasing Process: Select an appropriate degreaser and inject it into the pipeline system. The degreaser can be an organic solvent or an alkaline solution, the choice depending on the pipeline material and type of dirt. Ensure the degreaser thoroughly covers the interior pipeline walls and maintains a certain contact time.
Pipe flushing: Drain the degreaser from the pipeline system and flush with clean water to remove any remaining degreaser and dirt. High-pressure water or gas can be used for flushing during the process to ensure the cleanliness of the interior pipe walls.
Drying Pipelines: Utilize drying equipment or ventilation systems to evaporate or exhaust moisture within the pipeline, ensuring the inner wall remains dry. Drying can be achieved using hot air or nitrogen.
Inspection and Testing: After degreasing, inspect and test the pipeline to ensure its cleanliness and seal integrity. Visual inspections, pressure tests, or other relevant tests can be conducted.
Be mindful that when descaling high-vacuum pipelines of low-temperature liquid storage tanks, adhere to the relevant safety operation procedures and guidelines. Ensure that operators possess the necessary safety awareness and operational skills to prevent accidental incidents.

Chengjie Special Equipment is a company engaged in the manufacturing of low-temperature liquid storage tanks. They offer a range of low-temperature liquid storage tanks in various specifications and capacities, including liquid nitrogen tanks, liquid oxygen tanks, liquid argon tanks, and more.
The Zhongjie specialty low-temperature liquid storage tanks are constructed with high-quality materials and advanced manufacturing techniques, ensuring the tank's strength and sealing integrity. The internal design features special insulation materials and structure, effectively reducing liquid evaporation loss.
The Zhongjie special-purpose low-temperature liquid storage tank features the following characteristics:
High safety: Tanks are made of materials with excellent pressure resistance and sealing properties, capable of safely storing low-temperature liquids.
Low evaporation loss: The internal insulation materials and structural design of the tank effectively reduce liquid evaporation loss, enhancing the tank's economic efficiency.
Multiple specifications and capacity options: Zhongjie offers a variety of specifications and capacities for low-temperature liquid storage tanks to meet different customer needs.
Customized Design: Based on the specific requirements of our clients, Zhongjie Special Equipment can offer customized design and manufacturing services to cater to various application scenarios.
Batch manufacturing process: With state-of-the-art manufacturing equipment and a skilled technical team, Zhongjie can ensure the quality and performance of the storage tanks.
In summary, ZJET's low-temperature liquid storage tanks for customized manufacturing offer high safety, low evaporation loss, and a variety of specifications, making them suitable for storage and transportation needs of low-temperature liquids.

Nitrogen charging of 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:
Safe Operation: Prior to conducting nitrogen flushing operations on a liquid nitrogen tank, it must be confirmed that the operators have the relevant safety knowledge and skills. Operators should wear appropriate personal protective equipment, such as protective goggles, gloves, and protective clothing, etc.
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 have adverse effects on the liquid nitrogen within the storage tank.
Nitrogen Inerting Speed Control: During the nitrogen inerting process, the inerting speed should be controlled to avoid being too fast or too slow. Excessive inerting speed can lead to overly high internal pressure within the tank, while too slow of an inerting speed can result in prolonged inerting time.
Pressure Monitoring: During the nitrogen charging process, the internal pressure of the tank should be regularly monitored. Ensure the internal pressure of the tank is within the safe range and adjust as necessary.
Temperature Control: During the nitrogen flushing process, attention should be given to controlling the tank's temperature. The low temperature of liquid nitrogen can cause condensation and dew on the tank and pipes. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and dew.
Post-nitrogen flushing treatment: Upon completion of the nitrogen flushing operation, promptly shut down the nitrogen flushing equipment and inspect and clean the tank. Ensure there are no residual nitrogen or impurities inside the tank.
Note: Nitrogen flushing operations for liquid nitrogen tanks must strictly adhere to relevant safety standards.
Zhongjie Special Equipment adheres to the grand vision of "realizing employee dreams, creating customer value, and striving for the prosperity and strength of our motherland," devoting itself wholeheartedly to the development of green energy equipment. We dedicate high-quality products and services with competitive pricing to society!