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 Department 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.
Operation procedures for liquid oxygen storage tanks should be established based on specific tank design and usage requirements. The following are some common contents of general operation procedures for liquid oxygen storage tanks: - Operator Training: Ensure operators have received relevant training for liquid oxygen storage tanks, understanding the tank's structure, performance, operational procedures, and safety considerations. - Safety Inspections: Conduct necessary safety checks before operating the liquid oxygen storage tank, including inspecting the tank's integrity, the sealing of valves and pipes, and the condition of the insulation layer. - Liquid Oxygen Supply: Ensure the liquid oxygen supply system is functioning properly, including checking the status of the liquid oxygen supply pipes, valves, and pressure gauges, and ensuring an adequate supply of liquid oxygen. - Tank Pressure Control: Monitor the pressure of the liquid oxygen storage tank to ensure it remains within a safe range. If necessary, control the tank's pressure by adjusting pressure valves or pressure relief devices. - Leak Control: Regularly inspect the sealing of the tank and pipes to ensure there are no leaks. If a leak is detected, take immediate measures to control the leak and notify relevant personnel. - Fire Prevention Measures: Prohibit open flames and prevent sparks and high-temperature objects from contacting the tank around the liquid oxygen storage tank. Establish fire prevention facilities and fire-fighting equipment, and check and maintain them regularly. - Safety Distance: Maintain a certain safety distance around the liquid oxygen storage tank to prevent the spread of fires, explosions, and leaks. - Maintenance and Repair: Regularly perform maintenance and repairs on the tank, including cleaning the tank, inspecting the insulation layer, valves, and pipes, to ensure the tank operates normally. - Waste Disposal: Properly dispose of waste generated by the liquid oxygen storage tank, including liquid oxygen residues, waste gases, and waste liquids, following relevant environmental protection regulations and standards. Note that operation procedures for liquid oxygen storage tanks should be established based on specific tank design and usage requirements, and should comply with applicable regulations, standards, and safety guidelines. When operating liquid oxygen storage tanks, cooperate with local regulatory agencies and individuals to ensure the tank's safety and reliability.

When initially using a liquid nitrogen tank, there are some precautions to consider for safe and effective operation. Here are some suggested points to keep in mind:
Safe Operation: Liquid nitrogen is a cryogenic liquid with strong refrigerating and asphyxiating effects. When handling liquid nitrogen tanks, it is mandatory to wear appropriate personal protective equipment, such as insulated gloves and protective suits. Avoid direct contact with liquid nitrogen to prevent injury or other harm.
Ventilation Environment: Liquid nitrogen, upon evaporation, produces a large amount of gas that may displace other gases, leading to a decrease in oxygen content in the air. Therefore, when using liquid nitrogen tanks, it is essential to ensure adequate ventilation in the operating area to prevent oxygen deficiency.
Tank Inspection: Before first use of the liquid nitrogen tank, a thorough visual and seal check should be conducted. Ensure there are no visible damages, leaks, or other safety hazards. If any issues are found, they should be addressed promptly by repairing or replacing the tank.
Tank Filling: Prior to the initial use of the liquid nitrogen tank, it is necessary to fill the tank with liquid nitrogen. During the filling process, follow the correct operational steps and safety protocols to ensure a safe and reliable filling. Additionally, pay attention to controlling the filling speed and pressure to avoid excessive tank pressure and temperature rise.
Labeling and Record Keeping: Prior to the initial use of the liquid nitrogen tank, relevant information should be labeled on the tank, such as the storage medium, capacity, manufacturing date, etc. It is also recommended to establish a tank usage record, including filling dates, filling quantities, usage details, etc., for future tracking and management.
Note that the use of liquid nitrogen tanks involves safety risks such as low temperatures and high pressures. Operators should receive training and strictly adhere to the relevant operational procedures and safety measures. If you are unfamiliar with the operation or have any doubts, it is recommended to consult with experts or relevant institutions.

The cooling process and precautions for liquid argon cylinders are as follows:
Cooling Process Analysis:
Clean the Cylinder: Prior to cooling the liquid argon cylinder, ensure the interior is clean and free of impurities and contaminants. Use an appropriate cleaner for cleaning and rinse thoroughly.
De-gassing and Exhausting: Empty the gas inside the drum and expel it through the exhaust system to reduce the gas content within the drum.
Add Liquid Nitrogen: Inject liquid nitrogen into the tank, which can rapidly cool the air and walls inside the tank due to its low temperature, thereby reducing the tank's temperature.
Waiting for cooling: Liquid nitrogen will gradually lower the temperature inside the container through the process of heat conduction until it reaches the required low temperature.
Cautionary Notes:
Safety Protection: During the cooling process of the liquid argon tank, necessary safety precautions must be taken. 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 tank, it is necessary to regulate the tank's temperature to prevent overcooling or insufficient cooling. Temperature sensors and a temperature control system can be used to monitor and control the tank's temperature.
Insulation and Heat Retention: Liquid argon cylinders are typically designed with double or multi-layer structures, filled with insulating material in between to minimize heat transfer and evaporation of the liquid argon. Ensure the integrity and excellent insulation of the insulating layer.

Daily inspection of liquid nitrogen storage tanks primarily includes the following aspects:
Appearance Inspection: Check for any obvious damage, deformation, or corrosion on the tank's exterior, including the tank walls, valves, pipes, and joints.
Sealability Inspection: Verify the tank's sealing performance, including checking for leaks at valve and pipe connections, and ensuring the tank's exhaust valve and safety valve are functioning properly.
Pressure Check: Verify that the tank's pressure gauge is functioning properly and that the pressure is within the normal range to ensure the tank operates normally.
Level Check: Inspect the liquid nitrogen tank's level to ensure it's within the normal range, avoiding issues caused by levels that are too high or too low.
Insulation Layer Inspection: Verify the integrity of the storage tank's insulation layer, checking for any damage or detachment to ensure effective insulation and reduce evaporation losses of liquid nitrogen.
Leak Inspection: Check for signs of liquid nitrogen leakage around the storage tank, including any frost, ice, or liquid nitrogen stains on the ground.
Safety Equipment Inspection: Verify that the safety equipment of the storage tank, such as leak detectors, alarm systems, and safety valves, is functioning properly to ensure the tank's safety.
Cleaning Inspection: Regularly clean the interior of storage tanks to remove accumulated impurities and dirt, maintaining cleanliness and hygiene of the tanks.
Above are the key contents for daily inspections of liquid nitrogen tanks. The specific inspection items should be adjusted and supplemented based on the tank's model, usage, and relevant regulations. During the inspection process, strict adherence to the operational procedures and safety operation requirements is essential to ensure the safe operation of the tank.
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