Shandong Zhongjie Special Equipment Co., Ltd. (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license and an A2-grade pressure vessel manufacturing license, an A2-grade pressure vessel design license, B-grade boiler installation and GB2/Class, GC2/Class pressure pipeline installation licenses, and equipment and machinery installation contracting qualifications. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and a director unit of the Shandong Equipment Manufacturing Association. The company has also passed the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System certifications, and the American ASME/U2 certification.
Liquid oxygen tanks are equipment used for storing and supplying liquid oxygen. Liquid oxygen is the state of oxygen cooled below its boiling point, transforming it into a liquid. Liquid oxygen tanks are typically made with double or multi-layered structures, filled with insulating material in the middle to reduce heat transfer and evaporation of the liquid oxygen.
Liquid Oxygen Storage Tanks Feature the Following Characteristics:
High Purity: The liquid oxygen storage tank contains high purity liquid oxygen, typically exceeding 99.5% purity. This makes the liquid oxygen storage 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, the liquid oxygen storage tank must have excellent insulation properties to maintain the low temperature state 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 evaporation of the liquid oxygen.
High Pressure: Liquid oxygen 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, fire prevention measures must be implemented during the design and use of liquid oxygen storage tanks, ensuring there are no ignition sources in the vicinity and appropriate firefighting 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 the safe operation and usage of the tank.

The use and operation of the liquid oxygen storage tank system require attention to the following points:
Safe Operation: When operating the liquid oxygen storage system, it is mandatory to follow the relevant safety operating procedures and standards to ensure the safety of the operators.
Tank Selection: Choose liquid oxygen tanks that comply with regulations and standards, ensuring their quality and safety performance.
Tank Installation: Tanks should be installed on a solid foundation to ensure stability. Additionally, good ventilation should be maintained around the tank, and it should be kept away from flammable materials and heat sources.
Seal Integrity Inspection: Regularly check the sealing performance of the storage tank system to ensure there are no leakage issues at valve and pipe connections.
Pressure Control: The storage tank system should be equipped with a pressure gauge and a safety valve, with regular inspections and maintenance to ensure pressure remains within a safe range.
Fire Prevention Measures: Liquid oxygen contains a high oxygen content, which is prone to causing fires. Establish firewalls around the storage tank system, ban smoking and open flames, and ensure safety.
Static Protection: During the operation of the liquid oxygen system, static electricity may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment are taken to reduce the accumulation and release of static electricity.
Regular Inspections and Maintenance: Conduct regular checks on the tank system and related equipment, including valves, pipes, pressure gauges, etc. Ensure that the equipment is in perfect condition and promptly repair or replace any damaged parts.
Waste Gas Treatment: During the operation of the liquid oxygen system, waste gases are produced, and appropriate waste gas treatment measures must be taken to minimize environmental impact.
Above are the precautions to be taken when using the liquid oxygen storage tank system, to ensure operational safety and the smooth operation of the system. During operation, it should be strictly adhered to the relevant operational procedures and safety operation requirements to avoid accidents.

When selecting the insulation material for a low-temperature liquid storage tank, consider the following factors:
Thermal Conductivity: The lower the thermal conductivity of insulating materials, the better their insulating performance. Therefore, materials with lower thermal conductivity should be chosen, such as polyethylene foam (EPS), polyurethane foam (PUR), and silicate fibers.
Density: The density of insulating 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 tank. Therefore, a balance must be struck between the insulating performance and the requirements of the tank structure.
Corrosion Resistance: Due to the special working environment of low-temperature liquid storage tanks, the insulation material must have excellent corrosion resistance to withstand the erosion of the low-temperature liquid. For instance, glass fiber and silicate fiber offer good corrosion resistance.
Reliability and Durability: Insulating materials must have excellent 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 for insulation materials is also a factor to consider. 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, select an appropriate insulating material to provide excellent thermal insulation and durability, ensuring the safety and efficient operation of low-temperature liquid storage tanks. When choosing insulating materials, it is recommended to consult engineers or consulting agencies for more accurate advice and guidance.

The temperature difference between the interior and exterior of a low-temperature liquid storage tank depends on various factors, including the tank's design, insulation performance, the temperature of the liquid, and the ambient temperature. Generally speaking, the temperature inside the low-temperature liquid storage tank is much lower than the ambient temperature.
Low-temperature liquid storage tanks are commonly used for storing liquefied nitrogen, oxygen, argon, and other low-temperature liquids. These liquids have very low boiling points, usually below -100 degrees Celsius. To maintain the low temperature of the liquids, the internal insulation of the tank must be excellent to minimize heat transfer and evaporation loss.
Low-temperature liquid storage tanks typically provide a smaller temperature difference. Generally, the temperature inside the tank can be maintained near the boiling point of the liquid, usually several degrees cooler than the external environment. The specific temperature difference depends on the tank's design, insulation performance, and the properties of the liquid.
Note that the temperature difference in low-temperature liquid storage tanks may change over time. As time passes, the insulation material's performance may be affected by wear or aging, leading to an increase in temperature differences. Therefore, regular inspection and maintenance of the tank's insulation layer are crucial to ensure its effective and stable insulating performance.
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