Shandong Zhongjie Special Equipment's main products include: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG tanks, oxygen/nitrogen/argon tanks, and CO2 tanks; pressure vessel products such as denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment sets; central air conditioning and ventilation equipment such as ground (water) source heat pumps, air source units, water-cooled screw units, and air-cooled modules. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
Low-temperature liquid oxygen storage tanks typically require some safety accessories to ensure safe operation and to address potential risks. The following are some common safety accessories for low-temperature liquid oxygen storage tanks:
Pressure Sensor: Used to monitor pressure changes within storage tanks. If the pressure exceeds the set range, it will trigger an alarm or automatically stop the filling process to prevent overpressure in the tank.
Safety valve: Used to automatically release gas when the pressure inside the tank exceeds the set value, to prevent over-pressurization of the tank. The safety valve should be selected and installed according to the design pressure and capacity of the tank.
Pressure Relief Device: Used to release gas to a safe area when the pressure inside the storage tank is too high, in order to alleviate the pressure on the tank. The pressure relief device typically includes relief valves, relief piping, etc.
Level sensor: Used to monitor the level change of liquid oxygen inside storage tanks to ensure an adequate supply of liquid oxygen and prevent overfilling.
Temperature Sensor: Used to monitor temperature changes within storage tanks to ensure that the temperature of liquid oxygen inside the tank remains within a safe range.
Fire Detectors and Fire Suppression Systems: Designed to monitor fire risks around storage tanks and activate fire suppression systems as needed to prevent the spread of fire to other areas.

The hydrostatic test of a liquid nitrogen tank is a common testing method used to assess the tank's sealing and pressure resistance capabilities. Below are the general steps for a liquid nitrogen tank hydrostatic test:
Preparation: Ensure the tank interior is clean and that all gases and liquids have been drained from the tank. Check that the tank's sealing and safety devices are functioning properly.
Fill with water: Fill the internal tank with water, ensuring the water level is above the low water line. Use a pump or other appropriate methods for filling.
Apply Pressure: Gradually increase water pressure using a pressure pump or other pressure source until reaching the predetermined test pressure. The test pressure is typically 1.1 times the design working pressure of the tank.
Pressure Maintenance: After reaching the test pressure, maintain it for a period (typically 30 minutes to 1 hour) and observe for any abnormal conditions such as leakage or deformation in the tank.
Pressure Relief: Gradually release pressure to drain water from the tank until the tank is completely empty.
Inspection and Evaluation: Check for leaks, deformations, or other damage on the tank's surface and interior. Evaluate test results to ensure the tank meets design requirements and safety standards.
需要注意的是，液氮储罐水压试验需要由人员进行操作，并遵循相关的安全操作规程。在进行测试前，应仔细阅读和遵守储罐制造商提供的操作指南和安全注意事项。

Liquid Oxygen Storage Tanks are high-pressure, highly oxidizing equipment that requires special attention to safety. Here are some safety precautions for liquid oxygen storage tanks: - Operation: The operation of liquid oxygen storage tanks should be carried out by trained and experienced personnel. Operators should be familiar with the tank's structure, performance, and operational procedures, and should operate strictly according to the operation manual and safety regulations. - Fire Prevention Measures: Liquid oxygen is highly oxidizing and can easily cause fires and explosions. Open flames and sparks, as well as high-temperature objects, should be prohibited near the liquid oxygen storage tank. Fire prevention facilities and firefighting equipment should be established and regularly inspected and maintained. - Leak Control: In the event of a leak in the liquid oxygen storage tank, immediate measures should be taken to control the leak. Leaks can lead to oxygen evaporation and increased oxygen concentration, raising the risk of fire and explosion. A leak detection system should be set up, along with leak control devices and personal protective equipment. - Insulation Protection: Liquid oxygen storage tanks should have good insulation protection to minimize evaporation and maintain low temperatures. The insulation layer should be inspected and maintained regularly to ensure its integrity and insulating performance. - Safety Distance: A certain safety distance should be maintained around the liquid oxygen storage tank to prevent the spread of fires, explosions, and leaks. The specific requirements for safety distance should be assessed and determined according to local regulations and standards. - Regular Inspection and Maintenance: Liquid oxygen storage tanks should be regularly inspected and maintained, including checking the structural integrity of the tank, valves, and pipelines for tightness.

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 Interval: The horizontal interval between the liquid oxygen tank and the structure is typically 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 distance should be determined based on factors such as the tank's capacity, pressure, and the nature of the structure, with a general recommendation to maintain a safe distance.
Vertical Clearance: The vertical clearance between the liquid oxygen storage tank and the structure must also comply with relevant safety requirements. This is to prevent any danger to the structure in case of tank leakage or accidents. Specific clearance requirements will be determined based on factors such as the tank's capacity, pressure, and the height of the structure, generally recommending maintaining 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 liquid oxygen storage tanks and buildings to ensure that the fire does not spread or pose a danger to the structures. Specific fire retardant distance requirements:
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