Shandong Zhongjie Special Equipment specializes in products such as fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat recovery boilers, and other boiler products; vacuum insulation cryogenic pressure vessels like LNG tanks, oxygen-nitrogen-argon tanks, and CO2 tanks; pressure vessel products including denitrification engineering equipment, heat storage and energy storage equipment, and 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.
The safety distance for liquid oxygen storage tanks refers to the distance that needs to be maintained around the tank to ensure the safety of personnel and equipment. The specific requirements for safety distances may vary depending on different regions and application sites. Here are some common principles for safety distances: - Buildings and Equipment: Liquid oxygen storage tanks should maintain a certain safety distance from buildings, equipment, and other storage tanks to prevent the spread of fires, explosions, and leaks. The specific safety distance requirements should be assessed and determined based on local regulations and standards. - Ignition and Heat Sources: Liquid oxygen is highly oxidizing and prone to causing fires and explosions. Therefore, liquid oxygen storage tanks should be kept at a sufficient distance from ignition sources, heat sources, and flammable materials to prevent fires and explosions. - Ventilation and Exhaust: Good ventilation and exhaust should be maintained around liquid oxygen storage tanks to prevent the accumulation of vapor and the formation of explosive mixtures. The design and operation of ventilation and exhaust systems should comply with relevant safety standards and specifications. - Personnel and Traffic: Personnel and traffic around liquid oxygen storage tanks should be restricted and controlled to ensure personnel safety and the normal operation of the tank. Warning signs, safety fences, and restricted areas should be established to prevent unauthorized access to the tank area. It is important to note that the safety distance for liquid oxygen storage tanks should be assessed and determined based on the specific application site and safety requirements. When designing, installing, and operating liquid oxygen storage tanks, relevant regulations, standards, and safety guidelines should be followed to ensure the safety and reliability of the tank.

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 the hydrostatic test of a liquid nitrogen storage tank:
Preparation: Ensure the tank is clean inside and that the gas and liquid are drained. Check the tank's sealing and safety devices for proper operation.
Fill water: Fill the tank interior 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 the 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 Release: Gradually release pressure to drain water from the tank until it is completely empty.
Inspection and Evaluation: Check for leaks, deformations, or other damage on the surface and interior of the tank. Evaluate test results to ensure the tank meets design specifications 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。

The reasons for occasionally venting the liquid oxygen tank are primarily to maintain the safe pressure range within the tank and to prevent excessive pressure buildup. Here are several situations where a liquid oxygen tank might be vented periodically:
Pressure Control: During operation, the liquid oxygen storage tank experiences pressure changes due to evaporation of liquid oxygen and temperature fluctuations. To maintain a safe pressure range within the tank, regular venting is required to control the tank's pressure within a secure limit.
Prevent Overpressure Accumulation: During oxygen filling or usage, external factors or operational errors may cause the pressure inside the liquid oxygen tank to exceed the safe limit. To prevent overpressure accumulation, timely venting is required to alleviate the pressure within the tank.
Prevent Gas Accumulation: Liquid oxygen tanks may contain some gas impurities, such as air and water vapor. These gases can condense into liquids or solids at the low temperatures of liquid oxygen, blocking pipes or affecting the normal operation of the tank. Regularly releasing gas can expel these impurities, maintaining the tank's cleanliness and unobstructed flow.
It is essential that the release of liquid oxygen be performed by trained personnel, adhering strictly to the relevant operational procedures and safety measures. During the release process, precautions must be taken to prevent any leakage of liquid oxygen and contact with it, ensuring the safety and reliability of the operation.

The liquid oxygen tank possesses the following characteristics:
High Purity: The liquid oxygen storage tank contains high-purity liquid oxygen, typically achieving a purity of over 99.5%. This makes the liquid oxygen storage tank crucial in applications requiring high-purity oxygen, such as medical, industrial, and research fields.
Low Temperature: Since the boiling point of liquid oxygen is -183°C, the storage tank must have excellent thermal insulation properties to maintain the low temperature of the liquid oxygen. Tanks are typically designed with double or multi-layer structures, filled with insulating materials in between to reduce heat transfer and the evaporation of liquid oxygen.
High Pressure: Liquid oxygen tanks usually 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 can support combustion. Therefore, during the design and operation of liquid oxygen storage tanks, fire prevention measures must be taken to ensure there are no ignition sources around the tank, 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.
Corrosivity: Liquid oxygen possesses certain
Our company attaches great importance to technological innovation and research and development design. We have one municipal-level enterprise technology center in Heze City, equipped with non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and other testing facilities. We have over 600 various instruments and equipment, including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, etc. The key products and technologies we have developed, such as temperature and pressure vessel welding, biomass boiler emission reduction, and waste heat utilization, have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, Shandong Provincial key projects, and Heze City innovative and excellent projects. We have accumulated a total of 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. The technical team of our company, in collaboration with Professor Yajiang Li of Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + wire filling argon arc welding (PAW-GTAW) technology. After the provincial-level scientific and technological achievement appraisal, the technology level has reached the international standard in the field of deep cryogenic container manufacturing. Choose Zhongjie Special Equipment, let's create brilliance together!