Shandong Zhongjie Special Equipment Co., Ltd. (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: boilers, deep-freezing containers, pressure vessels, central air conditioning, engineering installation, international trade, and the Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop spanning 83,000 square meters. It currently 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.
When storing liquid nitrogen in low-temperature storage tanks, be mindful of the following points:
Protective Gear: When operating low-temperature storage tanks, it is mandatory to wear appropriate protective gear, including gloves, protective suits, and non-slip shoes. This gear protects the skin from the low temperatures of liquid nitrogen and other hazards.
Avoid direct contact: Liquid nitrogen is extremely cold and can cause chilling. Therefore, it is important 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.
Ventilation Requirements: In the operation area of low-temperature storage tanks, adequate ventilation must be ensured to expel gases produced by the evaporation of liquid nitrogen. Maintain air circulation to avoid excessive oxygen concentration, reducing the risk of fire and explosion.
Prevent Leaks: Regularly inspect the cryogenic storage tanks for leaks and equip with leak detectors and alarm systems. In case of a leak, take immediate measures to control and repair it. Avoid leaks of liquid nitrogen, which can pose harm to personnel and the environment.
Fire Prevention Measures: Liquid nitrogen has a low boiling and freezing point, which is prone to causing fires. To prevent and contain fires, firewalls and fire-resistant coatings are installed around low-temperature storage tanks.
Electrostatic Protection: Electrostatic buildup in low-temperature storage tanks may cause sparks, increasing the risk of fire. Measures should be

Routine inspections of liquid nitrogen storage tanks involve regular checks and maintenance to ensure safe operation and efficient use. Here is a common-sense introduction to the inspections of liquid nitrogen storage tanks:
Visual Inspection: Regularly inspect the exterior of the storage tank, including the tank body, insulation layer, valves, and pipelines, etc. Note any cracks, corrosion, wear, or other damage. Also, check that the insulation layer is intact with no damage or detachment.
Level Inspection: Regularly check the liquid nitrogen tank's level to ensure it remains within the normal range. Inspections can be conducted using level gauges or level scales, among other equipment.
Pressure Check: Inspect the tank's pressure to ensure it is within the safe range. Pressure gauges or pressure sensors can be used for the check.
Leak Inspection: Check for signs of liquid nitrogen leakage around the storage tank, such as vapor mist, frost, or freezing. If a leak is detected, take immediate action to repair it.
Valve and pipeline inspection: Verify that the valves and pipelines of the storage tank are functioning properly without any gas leaks or blockages. Ensure the tightness and unobstructed flow of the valves and pipelines.
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.
Maintenance Records: Promptly document the inspection results and maintenance records of the storage tank, including liquid level, pressure, insulating layer condition, leakage situations, etc. These records aid in monitoring the tank's operational status and timely identifying issues.
It's important to note that the inspection of liquid nitrogen tanks should adhere to relevant safety regulations and operational guidelines. Liquid nitrogen is highly flammable at low temperatures, so operators must wear appropriate personal protective equipment and ensure the operation area is free of any ignition sources. Regular inspections help identify issues promptly and allow for timely repairs, ensuring the safe and efficient operation of the tank.

The filling process for liquid nitrogen tanks typically includes the following steps:
Preparation: Ensure the tanks and filling equipment are in good condition with no damage or leaks. Check that the insulation layer of the tank is intact and undamaged.
Safety Inspection: Check the tank and its surrounding environment for safety. Ensure there are no flammable materials or other hazardous items in the vicinity of the tank.
Connect equipment: Link the filling equipment to the storage tank. Ensure the connection is securely fastened and leak-free.
Prepare Liquid Nitrogen: Ready for liquid nitrogen supply, ensuring the quality and purity meet the requirements.
Open valves: Follow the operation instructions of the filling equipment, gradually open the corresponding valves to allow liquid nitrogen to flow from the supply source into the storage tank.
Regulate Flow: Adjust the flow control valve of the filling equipment as needed to control the inflow speed of liquid nitrogen. Ensure the flow rate is moderate, avoiding too fast or too slow.
Level Monitoring: Real-time monitoring of the liquid nitrogen level within the storage tank through a level gauge or other level monitoring device. Ensure the level is maintained within a safe range.
Discontinue Filling: Once liquid nitrogen is filled in the tank or reaches the desired level, close the valve of the filling equipment to stop the inflow of liquid nitrogen.
Disconnect: Disconnect the filling equipment from the storage tank and ensure there are no leaks at the connection point.
Safety Inspection: Recheck the tank and its surrounding environment for safety, ensuring there are no leaks or other potential hazards.
The process described is for general reference only; the actual filling process may vary depending on the specific type of storage tank and filling equipment. When performing the filling operation for liquid nitrogen tanks, please adhere to the relevant operational specifications and safety requirements, and ensure that the operators are trained and skilled in safety measures.

The safety distance between liquid oxygen storage tanks and buildings is typically governed by relevant safety standards and regulations to ensure the safe distance and fire separation between the tank and the building. The following is a general reference for the safety distance between liquid oxygen storage tanks and buildings:
Horizontal Clearance: The horizontal clearance between the liquid oxygen storage tank and the structure is generally required to maintain a certain distance to prevent the tank from causing danger to the structure in the event of a leak or accident. The specific clearance distance should be determined based on factors such as the tank's capacity, pressure, and the nature of the structure, with a recommended minimum safety distance.
Vertical spacing: The vertical spacing between the liquid oxygen storage tank and the building must also comply with relevant safety requirements. This is to prevent any danger to the building in case of tank leakage or accidents. Specific spacing requirements will be determined based on factors such as the tank's capacity, pressure, and the height of the building, with a general recommendation to maintain a certain safety distance.
Fire Retardant Distance: Liquid oxygen has a high oxygen content and flammability. In the event of a leak or accident, it may cause a fire. Therefore, a certain fire retardant distance must be maintained between the liquid oxygen storage tank and the building to ensure that the fire does not spread or pose a danger to the building. Specific fire retardant distance requirements
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