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. The main workshop spans 83,000 square meters. Currently, it employs 710 staff, 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, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Liquid nitrogen storage tanks are equipment used for storing and transporting liquid nitrogen. To ensure safe operation, here are some common operational safety procedures for liquid nitrogen storage tanks:
Tank Installation: Tanks should be installed on a solid and level foundation, away from fire sources and flammable materials. Good ventilation around the tank is essential to prevent gas accumulation. The tank should maintain a safe distance from other equipment and buildings.
Liquid Nitrogen Filling: When filling with liquid nitrogen, appropriate liquid nitrogen transfer equipment should be used to avoid direct contact. During the filling process, it is crucial to control the flow and pressure of liquid nitrogen to prevent over-filling and excessive tank pressure.
Tank Pressure Control: Tanks should be equipped with pressure control devices to ensure internal pressure remains within safe limits. Regularly inspect and maintain these devices to ensure proper operation.
Leak Detection and Alarm Systems: Storage tanks should be equipped with leak detection and alarm systems to promptly detect and alert of any leaks. Regularly inspect and maintain the leak detection equipment to ensure proper functioning.
Fire and Explosion Prevention Measures: A fire-resistant isolation zone should be set around the storage tank, keeping it away from fire sources and flammable materials. The tank itself should adopt fire and explosion prevention measures, such as fire-resistant coatings and explosion-proof devices, to prevent fires and explosions.
Regular inspections and maintenance: Regularly inspect the tank's exterior, valves, and fittings to ensure they are undamaged. Conduct regular leak detection and pressure tests to ensure the tank's safety performance meets requirements.
Safety Training and Awareness Enhancement: Conduct safety training for operators to enhance their awareness and ability to handle liquid nitrogen tanks safely. Regularly hold safety training and drills to prepare for emergencies.
Establish comprehensive management records and documents, including tank usage, inspection, and maintenance records. Regularly review and update these records to ensure safe management and maintenance of the tanks.
Note that the above are some common protective procedures, which may vary depending on the type of tank and application. When using liquid nitrogen tanks, operate according to relevant specifications and standards, and consult with experts to ensure safety and effectiveness.

The oxygen filling process for liquid oxygen tanks must adhere to specific operational procedures and safety measures. Here are the steps for filling a liquid oxygen tank:
Preparation: Ensure the tanks and oxygen-filling equipment are in good working condition, check the tank's sealing integrity and the proper functioning of the safety valves.
Connect equipment: Link the oxygenation equipment to the storage tank, ensuring the connection is sealed reliably.
Prepare liquid oxygen: Transfer liquid oxygen from the storage container to the oxygen storage tank of the oxygen-filling equipment. During the transfer, be mindful to avoid any leaks or contact with the liquid oxygen.
Oxygen Filling Operation: Open the valve of the oxygen filling equipment and fill liquid oxygen from the storage tank into the tank. During the filling process, control the filling speed and pressure to avoid excessive tank pressure and temperature rise.
Monitoring and Control: During the aeration process, the tank's pressure and temperature must be monitored to ensure they remain within safe limits. In case of any anomalies, the aeration should be halted immediately and appropriate actions taken.
Oxygen Filling Completed: Close the valve of the oxygen filling equipment and cease the filling operation once the storage tank reaches the required oxygen level or pressure.
Safety Handling: After oxygenation is complete, safety handling is required, including closing relevant valves and emptying any remaining liquid oxygen from the oxygenation equipment.
Note that liquid oxygen is highly oxidizing and flammable; the oxygen filling process must strictly adhere to relevant safety operational procedures and standards. Operators should receive training and strictly follow the operational procedures and safety measures to ensure the safety and reliability of the filling process.

Liquid oxygen storage tanks are used for storing and supplying liquid oxygen. Liquid oxygen is oxygen that has been cooled below its boiling point, transforming it into a liquid state. These tanks are typically constructed with double or multi-layered structures, filled with insulating material in the middle to reduce heat transfer and the evaporation of liquid oxygen.
Liquid Oxygen Storage Tank Features:
High Purity: The liquid oxygen storage tank holds high purity liquid oxygen, typically exceeding 99.5% purity. This makes the liquid oxygen tank crucial in applications requiring high purity oxygen, such as medical, aerospace, and research fields.
Low Temperature: As the boiling point of liquid oxygen is -183°C, liquid oxygen storage tanks must have excellent insulation properties to maintain the low temperature of the liquid oxygen. Tanks are typically designed with double or multi-layer structures, filled with insulating material in between to reduce heat transfer and the evaporation of liquid oxygen.
High Pressure: Liquid oxygen storage tanks typically need to withstand high pressure to maintain their liquid state. The design and material selection of the tank must consider the pressure requirements of liquid oxygen to ensure the tank's safety and reliability.
Flammability: Liquid oxygen is highly flammable and supports combustion. Consequently, during the design and operation of liquid oxygen storage tanks, fire prevention measures must be implemented to ensure there are no ignition sources nearby, and appropriate fire extinguishing equipment is provided.
High Density: Liquid oxygen has a higher density than gaseous oxygen, allowing liquid oxygen tanks to store more oxygen. This gives liquid oxygen tanks an advantage in applications requiring large oxygen supplies, such as in the field.
The use of liquid oxygen tanks must strictly adhere to relevant safety regulations and operating guidelines to ensure safe operation and usage of the tanks.

Before filling the liquid nitrogen tank, the following checks must be conducted:
Tank exterior inspection: Check for any obvious damage, deformation, or corrosion on the tank's exterior, including the tank wall, valves, pipes, and joints.
Sealability Inspection: Check the tank's sealing performance, including inspecting for leaks at valves and pipe connections, to ensure the tank maintains good sealing integrity.
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: Verify the liquid level in the storage tank to ensure it remains within the normal range, avoiding issues caused by either too high or too low levels.
Insulation Layer Inspection: Verify that the insulation layer of the tank is intact, with no signs of damage or detachment, to ensure effective insulation and minimize evaporation losses of liquid nitrogen.
Leak Inspection: Check for signs of liquid nitrogen leakage around the storage tank, including 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.
Clean Inspection: Ensure the interior of the tank is clean, free of accumulated impurities and dirt, to maintain the tank's cleanliness and hygiene.
The above lists the checks required prior to filling the liquid nitrogen storage tank, ensuring the safe operation of the tank and proper storage of liquid nitrogen. During the inspection process, strict adherence to the relevant operational procedures and safety requirements must be maintained to ensure operational safety.
Zhong Jie Special Equipment upholds the grand vision of "realizing employees' dreams, creating value for customers, and striving for the prosperity and strength of our motherland," and is dedicated to the development of the green energy equipment industry. We contribute to society with products and services that offer high value for money!