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 seven business centers: boilers, deep-freezing 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. The main workshop spans 83,000 square meters. It currently employs 710 staff, including 247 engineers and technicians and 82 intermediate-level technical personnel. 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: Prior to 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.
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 the cleaning agent into the tank and use appropriate tools (such as a sprayer, brush, or high-pressure water) to clean the inner walls of the tank. Multiple cleanings can be performed as needed to ensure all contaminants are removed.
Washing and Discharge: After cleaning, rinse with clean water or an appropriate solvent to 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 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, adhere to 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 personnel and equipment safety. 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 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 storage tank loss is evaporation. If the insulation layer of the tank is damaged or the insulation performance is poor, evaporation loss will increase.
Leakage: A leak in a liquid nitrogen tank can also lead to increased liquid loss. Leaks may occur at the tank's interfaces, valves, pipes, and other parts. Leaks can be caused by equipment aging, material fatigue, improper operation, and other reasons.
Improper Operation: Incorrect operation 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 not repairing leaks in a timely manner.
Environmental Factors: Environmental elements can also affect the liquid nitrogen tank's liquid loss. For instance, high temperatures can decrease the tank's insulation performance, thereby increasing evaporation loss.
To minimize liquid nitrogen tank liquid loss, the following measures can be taken:
Ensure the tank's insulation is intact and perform regular inspections and maintenance.
Regularly inspect the tank's interfaces, valves, pipes, and other components 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 temperature around the tank.
It should be noted that liquid nitrogen tank liquid loss is inevitable, but with proper operation and maintenance, it can be minimized to a low extent.

During 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 connections and sealing of the pipeline system to ensure there are no leaks.
Cleaning Pipelines: Use appropriate cleaning agents and tools to clean 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 covers the inner pipeline wall 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 rinsing during the process to ensure the cleanliness of the pipeline interior.
Drying Pipelines: Utilize drying equipment or ventilation systems to evaporate or exhaust moisture from within the pipeline, ensuring the interior wall remains dry. Drying can be achieved with 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 during the degreasing process of high-vacuum pipelines for low-temperature liquid storage tanks, it is essential to 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.

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 clothing, and non-slip shoes. This equipment safeguards the skin from the low temperature 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, particularly with the skin. Use tools or utensils for handling, and prevent hands from coming into direct contact with liquid nitrogen.
Ensure good ventilation: In the operation area of the liquid nitrogen tank, it is mandatory to maintain adequate ventilation to expel gases produced by the evaporation of liquid nitrogen. Keep air flowing to avoid excessive oxygen concentration, and reduce the risk of fire and explosion.
Prevent Leaks: Regularly inspect the liquid nitrogen storage tank 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. To prevent and contain fires, firewalls and fire-retardant coatings should be installed around nitrogen liquid storage tanks.
Static Dissipation: 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 produce waste gas during operation, and appropriate waste gas treatment must be implemented.
Our company attaches great importance to technological innovation and R&D, with 1 city-level enterprise technology center in Heze City. We have established testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc., and equipped over 600 instruments and equipment such as CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, and plasma welding machines. The key products and technologies we have developed, such as welding of temperature-pressure vessels, emission reduction of biomass boilers, and waste heat utilization, have successively entered multiple Shandong Provincial Department of Industry and Information Technology scientific and technological innovation projects, Shandong Provincial key projects, and Heze City innovative and excellent 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. The technical team of our company, in collaboration with Professor Li Yajiang of Shandong University, has jointly developed deep cryogenic vessel processing technology using the international plasma arc + wire filling tungsten inert gas arc welding (PAW-GTAW) technology. After being appraised by the provincial level scientific and technological achievement, the technological level has reached an international standard in the field of deep cryogenic vessel manufacturing. Choose Zhongjietezhuang, let's join hands to create brilliance!