Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, 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 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 spanning 83,000 square meters. It currently employs 710 people, including 247 engineers and 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 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, it was identified as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
When cleaning low-temperature liquid storage tanks, the following steps should be taken:
Safety Preparations: Before cleaning, ensure there are no remaining liquids or gases inside the tank, and that the tank has been emptied and vented. Wear appropriate personal protective equipment, such as protective suits, gloves, and safety shoes.
Cleaning Agent 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 agents into the tank and clean the interior walls with appropriate tools (such as sprayers, brushes, or high-pressure water). Multiple cleanings may be performed as needed to ensure contamination removal.
Washing and Discharging: After cleaning, rinse with clean water or an appropriate solvent to remove all 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 residues of 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 are typically highly flammable and possess low-temperature characteristics, so operators must strictly follow safety procedures to ensure the safety of personnel and equipment. During the cleaning process, be cautious to prevent leaks of cleaning agents and contaminants, and take appropriate measures for handling and disposal.

Possible reasons for increased liquid nitrogen loss in storage tanks 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 storage tanks can also lead to increased liquid loss. Leaks may occur at the tank's interfaces, valves, pipes, and other areas. Leaks can be caused by equipment aging, material fatigue, improper operation, and other reasons.
Improper operation: Incorrect handling and maintenance may 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 conditions can also affect the liquid nitrogen tank's liquid loss. For instance, high temperatures can degrade the tank's insulating properties, leading to increased evaporation loss.
To minimize the liquid nitrogen loss in storage tanks, the following measures can be taken:
Ensure the tank's insulation is intact and perform regular inspections and maintenance.
Regularly inspect the tank's joints, valves, pipes, and other parts 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 implement cooling measures to maintain a low surrounding temperature.
It should be noted that liquid nitrogen storage tank liquid loss is unavoidable, but through proper operation and maintenance, it can be reduced to a minimum.

During the degreasing process in high vacuum pipelines of low-temperature liquid storage tanks, the following steps can be taken:
Preparation: Ensure that the defatting equipment and tools are clean and ready. Check the pipeline system's connections and seals, ensuring there are no leaks.
Pipe Cleaning: Clean pipes using suitable detergents and tools to remove 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 inner wall of the pipeline 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 a ventilation system 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 pipes to ensure their 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 the relevant safety operation procedures and guidelines. Ensure that operators possess the necessary safety awareness and operational skills to prevent accidental incidents.

Protective tips for liquid nitrogen tanks include the following:
Wear protective gear: When handling liquid nitrogen tanks, it is mandatory to wear appropriate protective gear, including gloves, protective 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 chilling. Hence, it is essential to avoid direct contact with liquid nitrogen, especially with the skin. Use tools or utensils for handling to prevent direct hand contact with liquid nitrogen.
Note Ventilation: In the operational area of the liquid nitrogen tank, adequate ventilation must be ensured to expel gases produced by the evaporation of liquid nitrogen. Maintain air circulation to avoid excessive oxygen concentration, and reduce the risk of fire and explosion.
Prevent Leaks: Regularly inspect the 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 the leakage of liquid nitrogen.
Fire Prevention Measures: Nitrogen liquid has a low boiling and freezing point, which is prone to fire. To prevent and contain fires, firewalls and fire-retardant coatings should be installed around nitrogen liquid storage tanks.
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 condition of liquid nitrogen tanks and related equipment, including valves, pipes, pressure gauges, etc. Ensure that 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 use, and appropriate waste gas treatment must be implemented.
Our company places great emphasis on technological innovation and research and development, boasting one municipal-level enterprise technology center in Heze City. We have established testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and more. We are equipped with over 600 types of 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. Our key products and technologies, such as thermal pressure vessel welding, biomass boiler emission reduction, and waste heat utilization, have successively been shortlisted for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, key provincial projects, and Heze City innovation and excellence projects. We have cumulatively obtained 27 authorized utility model patents, 16 authorized invention patents, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. The technical team of our company, in collaboration with Professor Li Yajiang of Shandong University, has developed deep cryogenic container processing technology using the internationally recognized plasma arc + wire filling 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!