Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Economic Development Zone, Heze City, with a registered capital of 50 million yuan and total assets of 500 million yuan. The company has 7 business centers: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and the Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters, with the main workshop area at 83,000 square meters. Currently, it employs 710 staff, including 247 engineering technicians and 82 middle-level technicians. In December 2016, it was recognized as a "High-tech Enterprise" by the Science and Technology Department. In June 2021, it was identified as a "Specialized and New Enterprise in Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
The filling of a low-temperature liquid nitrogen tank refers to the process of transferring liquid nitrogen from an external supply source into the tank. Below is an explanation of the filling process for low-temperature liquid nitrogen tanks:
Preparation: Prior to filling the liquid nitrogen tank, preparation is required. This includes inspecting the tank's condition and safety, ensuring the tank is clean, free of impurities, and pollutants. Additionally, check the quality of the liquid nitrogen supply source and the safety of the supply pipeline.
Connect supply source: Link the liquid nitrogen supply source to the liquid outlet of the storage tank. Ensure the connection is tight and secure to prevent leaks.
Control Liquid Level: During the bottling process, it is necessary to control the liquid nitrogen level to prevent overfilling or spillage. A level gauge or level control system can be used to monitor and control the liquid level.
Slow Injection: The injection of liquid nitrogen should be slow to prevent rapid vaporization and pressure increase. Appropriate valves and flow control devices can be used to regulate the injection rate.
Monitor Pressure: During the canning process, it is necessary to monitor the pressure of the storage tank to ensure it remains within a safe range. Pressure gauges or pressure sensors can be used for monitoring.
Canning Complete: Cease the injection of liquid nitrogen once the liquid level reaches the predetermined filling amount or the tank's capacity limit. Disconnect from the supply source and ensure the tightness of the filling port.
Safe Operation: Throughout the bottling process, it is necessary to adhere to relevant safety regulations and operational guidelines. Liquid nitrogen is highly flammable and extremely cold, so operators must wear appropriate personal protective equipment and ensure the operation environment is free of ignition sources.
When bottling liquid nitrogen, be mindful of its low-temperature properties and safety. Ensure safe operation and control throughout the bottling process to guarantee the safe operation of the storage tank and effective storage of the liquid nitrogen.

The spacing regulations between liquid oxygen tanks are typically governed by relevant safety standards and specifications to ensure safe distances and fire separations between tanks. Below is a reference to general spacing rules for liquid oxygen tanks:
Horizontal spacing between tanks: The horizontal spacing between liquid oxygen tanks is typically required to maintain a certain distance to prevent thermal conduction and mutual interference between the tanks. The specific spacing should be determined based on factors such as the tank capacity, pressure, and arrangement, generally suggesting a safe distance to ensure safe operation and maintenance between the tanks.
Tank and building or other facility spacing: The spacing between liquid oxygen tanks and buildings, other facilities must also comply with relevant safety requirements. This is to prevent any risk to surrounding buildings or facilities in the event of a tank leak or accident. Specific spacing requirements will be determined based on factors such as tank capacity, pressure, and surrounding environment, and generally, a certain safety distance is recommended.
Fire separation: It is crucial to maintain fire separation between liquid oxygen tanks and between tanks and buildings. Liquid oxygen has a high oxygen content and flammability, and in the event of a leak or accident, it can cause fires. Therefore, liquid oxygen tanks must maintain a certain distance from other facilities to prevent the spread of fire or danger to the surrounding environment.
Note that specific liquid oxygen tank spacing regulations may vary by region or industry. When designing, arranging, and operating liquid oxygen tanks, adhere to local safety standards and regulations, and consult with experts for accurate guidance.

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 surface, ensuring the tank's exterior is intact.
Pressure Testing: Regular pressure tests of the liquid oxygen storage tank are conducted to assess its pressure resistance. The tests should be carried out in accordance with relevant standards and regulations to ensure the tank 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 good sealing performance and no leakage issues.
Cleaning and Coating Protection: Regularly clean and apply protective coatings to liquid oxygen tanks to prevent corrosion and oxidation. Use appropriate cleaning agents during cleaning and avoid substances that react with liquid oxygen. Protective coatings can include anti-corrosion coatings or protective agents.
Regular Maintenance: Perform regular maintenance on liquid oxygen tanks, which includes inspecting and replacing seals, valves, safety devices, etc., to ensure proper operation and safety reliability.
Safety Training and Operating Procedures: Conduct safety training for personnel using liquid oxygen tanks to ensure they are aware of the safe operating procedures and precautions, to prevent 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 testing and maintenance of liquid oxygen tanks should be conducted by trained personnel, adhering to relevant safety operating procedures and standards. Additionally, a specific testing and maintenance plan should be established based on the tank's condition and usage requirements, and executed as per the plan.

During the degreasing process in high vacuum pipelines of low-temperature liquid storage tanks, the following steps can be taken:
Preparation: Ensure the cleanliness and readiness of the defatting equipment and tools. Check the pipeline system's connections and sealing, ensuring there are no leaks.
Pipe Cleaning: Utilize suitable cleaning agents and tools to clean pipes, removing surface dirt and grease. Methods may include mechanical brushing, high-pressure water jetting, or chemical cleaning.
De-greasing Process: Select an appropriate de-greaser and inject it into the pipeline system. The de-greaser can be an organic solvent or an alkaline solution, the choice depending on the pipeline material and type of dirt. Ensure the de-greaser thoroughly covers the interior pipeline walls and maintains a certain contact time.
Flush Pipeline: Drain the degreaser from the pipeline system and flush with clean water to remove any remaining degreaser and dirt. During the flushing process, high-pressure water or gas can be used for scrubbing to ensure the cleanliness of the pipeline interior.
Drying Pipeline: Utilize drying equipment or ventilation systems to evaporate or exhaust moisture within the pipeline, ensuring the interior wall remains dry. Drying can be achieved using hot air or nitrogen.
Inspection and Testing: After degreasing, inspect and test the pipes to ensure cleanliness and sealing. Visual inspection, pressure testing, or other relevant tests can be conducted.
Be mindful that when descaling high-vacuum pipelines of low-temperature liquid storage tanks, adhere to relevant safety operating procedures and guidelines. Ensure that operators are equipped with the necessary safety awareness and operational skills to prevent accidental incidents.
ZJ Special Equipment adheres to the great vision of "realizing employees' dreams, creating value for customers, and striving for the prosperity and strength of our motherland," wholeheartedly devoting itself to the development of green energy equipment. We offer the society high-value products and services!