Shandong Zhongjie Special Equipment Co., Ltd. specializes in the following products: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat recovery boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as 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 maintenance and precautions for liquid nitrogen tanks are crucial; here are some key points:
Maintenance:
Regular Inspections: Conduct regular inspections of the liquid nitrogen tank's exterior, valves, pipes, and other components to ensure they are intact and undamaged. Pay special attention to check for any leaks, corrosion, or other forms of damage.
Clean Storage Tanks: Regularly clean liquid nitrogen storage tanks to remove internal dirt and sediments. Use appropriate cleaning agents and tools, and follow the cleaning procedures and safety operating protocols.
Nitrogen Liquid Refill: Refill nitrogen liquid regularly as needed. Ensure the storage tank maintains an adequate nitrogen liquid inventory to meet usage requirements.
Maintain Pressure: Regularly check the liquid nitrogen tank's pressure to ensure it remains within the safe range. Perform pressure tests and adjustments as necessary.
Corrosion Treatment: Implement appropriate anti-corrosion measures based on the tank material and operating environment to extend the service life of the tank. For example, applying anti-corrosion coatings, conducting regular anti-corrosion treatments, etc.
Cautionary Notes:
Safe Operation: When using liquid nitrogen tanks, strict adherence to safety operating procedures and standards is mandatory. Operators must be trained, familiar with the properties of liquid nitrogen and safety operation requirements, and acquainted with the tank equipment and operational procedures.
Safety Precautions: When using liquid nitrogen tanks, necessary protective measures must be taken, such as wearing protective gloves and suits. Avoid direct contact with liquid nitrogen to prevent frostbite.
Leak Control: Regularly inspect the liquid nitrogen storage tank for leaks and equip with leak detectors and alarm systems. In the event of a leak, immediate action should be taken to control the leak and carry out repairs.
Ventilation Requirements: In enclosed spaces where liquid nitrogen tanks are in use, adequate ventilation must be ensured.

Proper installation of the liquid oxygen safety valve is a crucial step to ensure the safe operation of the liquid oxygen tank. Here are the installation steps for the liquid oxygen safety valve:
Select the appropriate safety valve: Choose a safety valve that meets the design pressure and flow requirements of the liquid oxygen storage tank. Ensure the rated pressure and flow of the safety valve align with the tank's specifications and comply with relevant safety standards and regulations.
Valve Installation Location: Choose a suitable location for the installation of the safety valve. Typically, the safety valve should be mounted on the top or side of the liquid oxygen storage tank to allow for timely pressure release in the event of overpressure.
Preparation for installation interfaces: Prepare the corresponding interfaces according to the connection method of the safety valve. This may include welding interfaces, threaded interfaces, or flange interfaces, etc. Ensure the sealing and firmness of the connections.
Install the safety valve: Mount the safety valve onto the prepared interface. Follow the installation instructions for the safety valve to ensure proper connection and secure tightening.
Adjustment and Testing: After installation, adjust and test according to the requirements of the safety valve. Ensure that the opening and closing pressures of the safety valve meet the design specifications, and conduct a leakage test to ensure sealing.
Identification and Record: Label the safety valve with relevant information such as rated pressure, flow rate, and installation date. Additionally, record the installation details and test results of the safety valve for future reference and maintenance.
When installing the liquid oxygen storage tank safety valve, it is imperative to adhere to the relevant safety regulations and operation guidelines. If you lack the necessary experience and knowledge, it is recommended to seek assistance and guidance from a professional to ensure the correct installation and reliable operation of the safety valve.

Prior to using the liquid oxygen tank, the following preparations must be made:
Safety Inspection: Ensure the tank and its surrounding environment are safe. Check for any damage, leaks, or other potential hazards. Confirm that there are no flammable materials or other hazardous items in the vicinity of the tank.
Tank Preparation: Inspect the tank's exterior, including the shell, welds, valves, and fittings. Ensure there are no visible damages or corrosion. Check that the insulation layer is intact and undamaged.
Liquid Oxygen Filling: Utilize liquid oxygen transfer equipment to fill the tank with liquid oxygen. Ensure that the flow rate and pressure of the liquid oxygen are maintained within safe limits during the filling process.
Pressure Control: Storage tanks should be equipped with pressure control devices to ensure internal pressure is within a safe range. Inspect and adjust the pressure control devices to ensure proper operation.
Valve Operation: Check that the valves and connections on the tank are functioning properly. Ensure the valves open and close smoothly and reliably. Adjust the opening and closing status of the valves as needed.
Safety equipment: Inspect the safety equipment around the storage tank, such as fire separation areas and alarm systems, to ensure they are functioning properly.
Operator Training: Ensure operators are proficient in the safe operation of liquid oxygen storage tanks.

When storing liquid nitrogen in low-temperature storage tanks, the following points should be noted:
Protective Gear: When handling low-temperature storage tanks, it is mandatory to wear appropriate protective gear, including gloves, protective clothing, and non-slip shoes. This gear safeguards 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 essential to avoid direct contact with liquid nitrogen, especially with the skin. Use tools or equipment for handling, and prevent hands from coming into direct contact with liquid nitrogen.
Ventilation Requirements: In the operational 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, and reduce the risk of fire and explosion.
Prevent Leaks: Regularly inspect the cryogenic storage tanks for leaks and equip them with leak detectors and alarm systems. In case of a leak, take immediate action to control and repair it. Avoid the harm caused by liquid nitrogen leaks to personnel and the environment.
Fire prevention measures: Liquid nitrogen has a low boiling and freezing point, which is prone to cause fires. Firewalls and fire-retardant coatings are installed around low-temperature storage tanks to prevent fires from occurring and spreading.
Static Protection: Electrostatic buildup in low-temperature storage tanks may cause sparks, increasing the risk of fire. Measures should be
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