Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Economic and Technological 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: boiler, deep-freezing containers, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It operates three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop spanning 83,000 square meters. The company currently employs 710 staff, including 247 engineering technicians and 82 intermediate-level technicians. In December 2016, it was recognized as a "High-tech Enterprise" by the Science and Technology Department. In June 2021, it was named a "Specialized and New Enterprise in Shandong Province" by the Department of Industry and Information Technology. In June 2022, it was identified as a "Gazelle Enterprise in Shandong Province" and in August 2022, it was recognized as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
When cleaning a low-temperature liquid storage tank, the following steps should be taken:
Safety Preparations: Prior to cleaning, ensure there are no remaining liquids or gases inside the tank, and that the tank has been properly drained and vented. Wear appropriate personal protective equipment, such as protective suits, gloves, and safety shoes.
Cleaner Selection: Choose a cleaner suitable for low-temperature environments and liquid storage tank materials. Common cleaners include acidic and alkaline solutions, organic solvents, or specialized cleaners. Select the appropriate cleaner based on the tank material and the nature of the contaminants.
Cleaning Process: Inject cleaning agent into the tank and clean the interior walls with appropriate tools (such as sprayers, brushes, or high-pressure water). Multiple cleanings can be performed as needed to ensure contamination is removed.
Washing and Discharging: After cleaning, rinse with clean water or an appropriate solvent to thoroughly remove cleaning agents and residues. Ensure the tank is dry and discharge the rinse water into an appropriate treatment system.
Inspection and Verification: After cleaning, inspect the tank to ensure no residual contaminants remain inside. Appropriate testing equipment or methods, such as optical inspection, chemical analysis, or ultrasonic testing, can be used to verify the cleaning effectiveness.
Be mindful that when cleaning low-temperature liquid storage tanks, it's crucial to adhere to the relevant safety regulations and operational guidelines. Liquid storage tanks typically possess high flammability and low-temperature characteristics, so operators must strictly follow safety protocols to ensure the safety of personnel and equipment. During the cleaning process, attention should be given to prevent leaks of cleaning agents and contaminants, and appropriate measures should be taken for their disposal.

Possible reasons for increased liquid nitrogen tank liquid loss may include:
Evaporation Loss: Liquid nitrogen is a cryogenic liquid with a boiling point of -196 degrees Celsius. Even under good insulation conditions, liquid nitrogen will evaporate. Therefore, the main cause of liquid nitrogen tank liquid loss is evaporation. If the insulation layer of the tank is damaged or the insulation performance is poor, evaporation loss will increase.
Leakage: Leaks in liquid nitrogen tanks can also lead to increased liquid loss. Leaks may occur at the tank's interfaces, valves, pipes, and other components. Leaks can be caused by equipment aging, material fatigue, improper operation, and other factors.
Improper operation: Incorrect handling and maintenance can also lead to increased liquid nitrogen loss in storage tanks. For example, frequently opening the tank lid, leaving the lid open for extended periods, and failing to repair leaks in a timely manner.
Environmental Factors: Environmental elements can also affect the liquid nitrogen tank's liquid loss. For instance, high-temperature environments can degrade the tank's insulation performance, thereby increasing evaporation loss.
To minimize liquid nitrogen loss in storage tanks, the following measures can be taken:
Ensure the tank's insulation is intact and conduct regular inspections and maintenance.
Regularly inspect the tank's interfaces, valves, pipelines, etc., to ensure good sealing performance and prevent leaks.
Strictly control the frequency and duration of tank openings to prevent unnecessary liquid evaporation.
Avoid using liquid nitrogen tanks in high-temperature environments, or take cooling measures to maintain a low surrounding environment temperature.
It should be noted that liquid nitrogen tank liquid loss is unavoidable, but with reasonable operation and maintenance, it can be minimized to a low extent.

In the degreasing process of high vacuum pipelines in 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 to ensure there are no leaks.
Cleaning Pipelines: Use appropriate cleaning agents and tools to clean the pipelines, removing surface dirt and grease. Methods such as mechanical brushing, high-pressure water jetting, or chemical cleaning can be employed.
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 coats the inner pipeline wall and maintains a certain contact time.
Flush Pipes: 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 rinsing to ensure the interior of the pipes is clean.
Drying Pipe: Utilize drying equipment or a ventilation system to evaporate or exhaust moisture from within the pipe, ensuring the interior surface is dry. Drying can be achieved using hot air or nitrogen.
Inspection and Testing: After degreasing, inspect and test the pipelines to ensure their cleanliness and integrity. Visual inspections, pressure tests, or other relevant tests can be conducted.
Be mindful that when descaling high-vacuum pipelines for low-temperature liquid storage tanks, adhere to the relevant safety operation procedures and guidelines. Ensure the operators are equipped with the necessary safety awareness and operational skills to prevent any accidental incidents.

Protection techniques for liquid nitrogen tanks include the following:
Wear protective gear: When operating liquid nitrogen tanks, it is mandatory to wear appropriate protective gear, including protective gloves, suits, and non-slip shoes. This gear safeguards the skin from the low temperatures of liquid nitrogen and other hazards.
Avoid direct contact: Liquid nitrogen is extremely cold and can cause frostbite. Therefore, it is essential to avoid direct contact with liquid nitrogen, especially with the skin. Use tools or equipment for handling, and never touch liquid nitrogen with your hands.
Ensure good ventilation: In the operational area of the liquid nitrogen storage tank, proper ventilation is essential to expel gases produced by the evaporation of liquid nitrogen. Maintain air circulation to avoid high oxygen concentrations and reduce the risk of fire and explosion.
Prevent Leaks: Regularly inspect liquid nitrogen tanks for leaks and equip with leak detectors and alarm systems. In case of a leak, take immediate action to control and repair it. Avoid hazards to personnel and the environment caused by liquid nitrogen leaks.
Fire Prevention Measures: Nitrogen liquid has a low boiling and freezing point, which is prone to fire. Measures such as setting up firewalls around nitrogen liquid storage tanks and using fire-resistant coatings are taken to prevent fires from occurring and spreading.
Static Protection: The accumulation of static electricity in liquid nitrogen tanks may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment should be taken to reduce the accumulation and release of static electricity.
Regular Inspections and Maintenance: Conduct regular checks on the status of liquid nitrogen tanks and related equipment, including valves, pipes, pressure gauges, etc. Ensure the equipment is in perfect condition and promptly repair or replace any damaged parts.
Waste Gas Treatment: Liquid nitrogen tanks will produce waste gas during operation, and appropriate waste gas treatment measures must be taken.
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 various instruments and 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 and technologies we have developed, such as welding for temperature and pressure vessels, biomass boiler emission reduction, and waste heat utilization, have successively been selected for 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 a total of 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 Li Yajiang of Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + wire feeding argon arc welding (PAW-GTAW) technology. After provincial-level scientific and technological achievement identification, the technical level has reached international standards in the field of deep cryogenic container manufacturing. Choose Zhongjie Special Equipment, and let's create brilliance together!