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-freeze container, pressure vessel, central air conditioning, engineering installation, international trade, and Internet of Things. It has three factory sites on Jinnan Road, East Yangtze Road, and Bohai Road, covering a total of 200,000 square meters. The main workshop spans 83,000 square meters. Currently, there are 710 employees, 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 Department 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.
Daily inspections of liquid nitrogen tanks should include the following aspects:
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 scale, among other equipment.
Pressure Check: Inspect the tank's pressure to ensure it remains within a safe range. Pressure gauges or pressure sensors can be used for the check.
Insulation Layer Inspection: Check for any damage or detachment in the tank's insulation layer. The integrity of the insulation layer is crucial for reducing heat transfer and the evaporation of liquid nitrogen.
Leak Inspection: Check for signs of liquid nitrogen leakage around the storage tank, such as vapor fog, frost, or freezing. If a leak is detected, take immediate measures to repair it.
Valve and Pipe Inspection: Verify that the valves and pipes of the storage tank are functioning properly without any gas leaks or blockages. Ensure the tightness and unobstructed flow of the valves and pipes.
Safety Device Inspection: Examine the safety devices of the storage tank, such as pressure relief valves, temperature sensors, and level alarms, to ensure they are functioning properly.
External Tank Cleaning: Regularly clean the exterior surface of the tank to remove dust, grime, and debris. Maintain the tank's appearance for easy inspection and maintenance.
Record and Documentation: Timely record the inspection results and maintenance records of the storage tank, including liquid level, pressure, insulation layer condition, leakage status, etc. These records help monitor the tank's operational status and promptly identify issues.
Above is the routine inspection content for liquid nitrogen storage tanks. Regularly conducting these checks ensures the safe operation and effective use of the tanks. At the same time, adhere to relevant safety regulations and operational guidelines to ensure the safety of personnel and equipment.

During the operation of low-temperature storage tanks, it is indeed necessary to avoid the occurrence of wrinkling. Wrinkling refers to the phenomenon where the tank walls develop creases or deformations, which may lead to a decrease in the structural integrity of the tank and could even cause leaks or ruptures.
Below are some precautions to avoid tank squeezing in low-temperature storage:
Tank Design: Select an appropriate tank design that can withstand the pressure and weight of low-temperature liquids. The wall thickness and supporting structure of the tank should comply with relevant standards and regulations.
Material Selection: Choose materials suitable for low-temperature environments with sufficient strength and low-temperature resistance. Common materials include low-temperature steel, stainless steel, etc.
Insulation Layer for Storage Tanks: The design and construction of the insulation layer must meet requirements to ensure effective reduction of heat conduction and temperature fluctuations. The material and thickness of the insulation layer should be selected based on specific circumstances.
Tank Operation: During the loading and unloading of liquids in the tank, it is essential to avoid rapid or excessive fluid flow to minimize impact and stress concentration on the tank walls.
Tank Maintenance: Regularly inspect and maintain the structure and insulation of the tanks to ensure they remain undamaged. Any abnormalities or damage should be promptly repaired or replaced.
Temperature Control: During the operation of low-temperature liquid storage tanks, it is essential to strictly control the temperature difference between the inside and outside of the tank to avoid excessive temperature fluctuations and thermal stress.
In summary, preventing tank deformation due to low temperatures hinges on rational design, material selection, proper installation and maintenance of insulation, and strict control of temperature variations. Regular inspections and maintenance are crucial for ensuring the safe operation of storage tanks.

Liquid Argon Storage Tanks are equipment used for storing and transporting liquid argon, with the following scope and characteristics:
Application Scope:
Industrial Applications: Liquid argon storage tanks are widely used in various industrial sectors, such as metal processing, electronic manufacturing, semiconductor production, etc.
Application: Liquid argon storage tanks are used in the field for cryogenic preservation of biological samples, cells, tissues, and vaccines.
Laboratory Applications: Liquid argon tanks are used in scientific research laboratories for low-temperature experiments, cryopreservation, and sample processing, etc.
Features:
Low-temperature Performance: Liquid argon has a boiling point of -185.7°C, thus the liquid argon storage tank must have excellent low-temperature insulation properties to maintain the low-temperature state of the liquid argon.
High sealing property: Liquid argon storage tanks must have excellent sealing performance to prevent evaporation loss of liquid argon and the entry of external air.
Safety: Liquid argon is a flammable and explosive substance; therefore, liquid argon storage tanks must be equipped with safety valves, leak detectors, and other safety devices to ensure safe operation.
High Capacity: The capacity of liquid argon storage tanks ranges from a few liters to several thousand liters, allowing for the selection of an appropriate capacity to meet requirements.
Cautionary Notes:
Protective Gear: When operating liquid argon tanks, it is mandatory to wear appropriate protective gear, including gloves, protective clothing, and anti-slip shoes, to safeguard against the low temperatures of liquid argon and other hazards.
Ventilation Requirements: Please specify

The cooling process and precautions for liquid argon cylinders are as follows:
Cooling Process Analysis:
Ensure Tank Cleanliness: Prior to cooling the liquid argon tank, it is crucial to ensure the internal cleanliness, free from impurities and contaminants. Use appropriate cleaning agents for washing and rinse thoroughly.
Deaeration and exhaust: To remove gas from the tank and exhaust it through the exhaust system to reduce the gas content within the tank.
Add Liquid Nitrogen: Inject liquid nitrogen into the tank, which can rapidly cool the air and walls inside the tank, thereby reducing the tank's temperature.
Wait for cooling: Liquid nitrogen will gradually lower the temperature inside the tank through heat conduction until it reaches the required low temperature.
Important Notes:
Safety Protection: Necessary safety precautions must be taken during the cooling process of liquid argon tanks. Liquid argon has low temperatures and high flammability, so operators should wear protective suits, gloves, and other personal protective equipment to ensure safe operation.
Fire Prevention Measures: Liquid argon is highly flammable; therefore, during the cooling process of the liquid argon tank, it is essential to ensure there are no ignition sources in the surrounding environment and to have appropriate fire extinguishing equipment on hand.
Temperature Control: During the cooling process of the liquid argon cylinder, it is necessary to control the cylinder's temperature to prevent overcooling or insufficient cooling. Temperature sensors and a temperature control system can be used to monitor and control the cylinder's temperature.
Insulation and Heat Retention: Liquid argon cylinders are typically designed with double or multi-layer structures, filled with insulating material in the middle to minimize heat transfer and evaporation of the liquid argon. Ensure the integrity and good insulating properties of the insulation layer.
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