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 deep-freeze pressure vessels such as LNG storage tanks, oxygen-nitrogen-argon storage tanks, CO2 storage tanks; pressure vessel products like denitrification engineering equipment, heat storage and energy storage equipment, complete chemical equipment sets; central air conditioning and HVAC equipment such as ground (water) source heat pumps, air-source units, water-cooled screw units, and air-cooled modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
Operation procedures for liquid oxygen storage tanks should be established based on the specific tank design and usage requirements. Below 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, operation procedures, and safety considerations. Safety Inspections: Conduct necessary safety checks before operating the liquid oxygen storage tank, including inspecting the tank's integrity, the tightness of valves and pipelines, and the condition of the insulating layer. Liquid Oxygen Supply: Ensure the liquid oxygen supply system is functioning properly, including checking the status of liquid oxygen supply pipelines, valves, and pressure gauges, ensuring an adequate supply. Tank Pressure Control: Monitor the pressure of the liquid oxygen storage tank and ensure it remains within a safe range. If necessary, control the tank's pressure by adjusting pressure valves or pressure relief devices. Leakage Control: Regularly check the tightness of the tank and pipelines to ensure there are no leaks. If a leak is detected, take immediate action to control the leakage and notify relevant personnel. Fire Prevention Measures: Prohibit open flames and prevent sparks and high-temperature objects from contacting the storage tank. Establish fire prevention facilities and firefighting equipment, and conduct regular inspections and maintenance. 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 insulating layer, valves, and pipeline conditions, ensuring the tank operates normally. Waste Disposal: Properly dispose of waste generated from liquid oxygen storage tanks, including liquid oxygen residues, waste gases, and waste liquids, adhering to relevant environmental protection regulations and standards. It should be noted that operation procedures for liquid oxygen storage tanks should be established based on the specific tank design and usage requirements and should follow applicable regulations, standards, and safety guidelines. When operating liquid oxygen storage tanks, cooperation with local regulatory authorities and personnel should be ensured to guarantee the tank's safety and reliability.

The spacing regulations between liquid oxygen storage tanks are typically governed by relevant safety standards and specifications to ensure safe distances and fire separations between the tanks. The following is a reference to general spacing rules for liquid oxygen storage tanks:
Horizontal spacing between tanks: The horizontal spacing between liquid oxygen tanks is typically required to maintain a certain distance to prevent heat transfer and mutual influence between tanks. The specific spacing should be determined based on factors such as tank capacity, pressure, and arrangement, with a general recommendation to maintain a safe distance to ensure safe operation and maintenance between tanks.
Tank and building or facility spacing: The spacing between liquid oxygen tanks and buildings, other facilities must also meet relevant safety requirements. This is to prevent the tanks from causing danger to surrounding buildings or facilities in the event of a leak or accident. Specific spacing requirements will also be determined based on factors such as the tank's capacity, pressure, and surrounding environment, with a general recommendation to maintain a certain safety distance.
Fire Separation: It is crucial to maintain adequate fire separation between liquid oxygen tanks and between tanks and buildings. Liquid oxygen has a high oxygen content and is highly flammable, which could lead to fires in the event of a leak or accident. Therefore, liquid oxygen tanks must be kept at a certain distance from other facilities to prevent fire spread or danger to the surrounding environment.
Note that specific liquid oxygen tank spacing regulations may vary by region or industry. When designing, arranging, and operating liquid oxygen tanks, adhere to local safety standards and regulations, and consult with experts for accurate guidance.

When selecting the insulation material for a low-temperature liquid storage tank, consider the following factors:
Thermal Conductivity: The lower the thermal conductivity of an insulating material, the better its insulating performance. Therefore, materials with lower thermal conductivity should be chosen, such as polyethylene foam (EPS), polyester foam (PUR), and silicate fibers.
Density: The density of thermal insulation materials also affects their insulating performance. Generally, the higher the density, the better the insulating performance. However, excessively high density may increase the weight and cost of the storage tank. Therefore, a balance needs to be struck between insulating performance and the requirements for the storage tank structure.
Corrosion Resistance: Due to the special working environment of low-temperature liquid storage tanks, the insulation material needs to have excellent corrosion resistance, capable of withstanding the erosion of low-temperature liquids. For example, glass fiber and silicate fiber possess good corrosion resistance.
Reliability and durability: Insulation materials must have good reliability and durability, maintaining their insulating properties over the long term. Choose verified and tested materials to ensure their quality and performance.
Construction convenience: The ease of installation and maintenance of the thermal insulation material is also a consideration factor. Choosing materials that are easy to install and maintain can enhance construction efficiency and reduce costs.
Environmental Friendliness: Consider selecting environmentally friendly insulation materials, such as recyclable ones, to minimize environmental impact.
Considering these factors, you can select suitable insulation materials to provide excellent thermal insulation and durability, ensuring the safety and efficient operation of low-temperature liquid storage tanks. When choosing insulation materials, it is recommended to consult with engineers or consulting agencies for more accurate advice and guidance.

A hydrostatic test of a liquid nitrogen storage tank is a common method used to check the tank's sealing and pressure resistance. Below are the general steps for a hydrostatic test of a liquid nitrogen storage tank:
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 water: Fill the tank internally with water, ensuring the water level is above the low water mark. Pump or other appropriate methods may be used for filling.
Apply Pressure: Gradually increase water pressure using a pressure pump or other pressure source until the predetermined test pressure is reached. 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 (usually 30 minutes to 1 hour), and observe for any abnormal conditions such as leaks or deformation in the tank.
Pressure Relief: Gradually release pressure to drain water from the tank until it is completely empty.
Inspection and Evaluation: Check for leaks, deformation, or any other damage on the surface and inside of the tank. Evaluate the 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。
Zhong Jie Special Equipment adheres to the great 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 commit to society with products and services that offer high value for money!