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 storage tanks, oxygen/nitrogen/argon storage tanks, and CO2 storage tanks; pressure vessel products like 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 modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
The filling process for liquid nitrogen tanks typically includes the following steps:
Preparation: Ensure that the storage tank and filling equipment are in good condition with no damage or leaks. Check that the tank's insulation layer is intact and undamaged.
Safety Inspection: Check the tank and its surrounding environment for safety. Ensure there are no flammable materials or other hazardous items in the vicinity of the tank.
Connect equipment: Link the filling equipment to the storage tank. Ensure a tight and reliable connection with no leaks.
Prepare Liquid Nitrogen: Provide liquid nitrogen supply, ensuring the quality and purity meet the required standards.
Turn on valves: Follow the operation instructions for the filling equipment, gradually open the corresponding valves to allow liquid nitrogen to flow from the supply source into the storage tank.
Regulate Flow: Adjust the flow control valve of the filling equipment as needed to control the inflow speed of liquid nitrogen. Ensure the flow rate is moderate, avoiding both too fast and too slow.
Monitor Liquid Level: Real-time monitoring of the liquid nitrogen level within the storage tank through a liquid level gauge or other level monitoring devices. Ensure the level is maintained within a safe range.
Cease Filling: Close the valve of the filling equipment once the liquid nitrogen is filled in the tank or reaches the desired level, halting the filling process.
Disconnect: Disconnect the filling equipment from the storage tank, ensuring there are no leaks at the connection point.
Safety Inspection: Conduct another check of the tank and its surrounding environment to ensure there are no leaks or other safety hazards.
Please note that the process described is for general reference only; the actual filling procedure may vary depending on the specific type of tank and filling equipment. When performing the filling operation for a liquid nitrogen tank, please adhere to the relevant operational specifications and safety requirements, and ensure that the operators are trained and skilled in the necessary safety measures.

During the process of constructing low-temperature liquid oxygen storage tanks with central oxygen supply, particular attention should be paid to the following aspects:
Safe Operation: Strict adherence to safety procedures and standards is mandatory during the storage tank installation process. Operators must be trained, familiar with the properties and safety requirements of liquid oxygen, acquainted with the equipment and operational procedures, to ensure safe operation.
Fire Prevention Measures: Liquid oxygen contains a high oxygen content and is prone to causing fires. During the installation process, necessary fire prevention measures should be taken, such as setting up fire barriers, using fire-resistant coatings, and prohibiting open flames, to prevent the occurrence and spread of fires.
Leakage Control: Pay attention to leakage control during the assembly process. Oxygen concentration may increase due to the leakage of liquid oxygen, which can raise the risk of fire and explosion. Equip with leak detection and alarm systems to promptly detect and control leaks, and take appropriate emergency measures.
Oxygen Concentration Monitoring: During the installation process, the oxygen concentration around the liquid oxygen storage tank should be monitored regularly. High oxygen concentrations can intensify the combustion of flammable materials, increasing the risk of fire and explosion. Take timely measures to ensure the oxygen concentration remains within safe limits.
Grounding and Static Electricity Protection: During the liquid oxygen plant process, ensure that the storage tank and related equipment are properly grounded to reduce the accumulation and discharge of static electricity. Utilize static conductive materials and antistatic equipment to minimize the dangers caused by static electricity.
Regular inspections and maintenance: After the installation is completed, regular inspections and maintenance of the liquid oxygen storage tank should be conducted. This includes visual inspections, pressure tests, leak detection, etc., to ensure the tank's safety and stability.
It is essential that the operation of the central oxygen supply low-temperature liquid oxygen storage tank be conducted by experienced personnel, adhering to relevant safety operation procedures and standards. During the setup process, close attention must be paid to safety risks, and timely measures should be taken to ensure the safety and stability of the setup.

Liquid nitrogen tanks are used for storing and transporting liquid nitrogen. To ensure their safe operation, here are some common protective procedures for the use of liquid nitrogen tanks:
Tanks Installation: Tanks should be installed on a sturdy and level foundation, away from fire sources and flammable materials. Good ventilation around the tank should be maintained to prevent gas accumulation. Adequate safety distances should be kept between the tank and other equipment and buildings.
Liquid Nitrogen Filling: Use liquid nitrogen transfer equipment when filling, to avoid direct contact with liquid nitrogen. During the filling process, be sure to control the flow and pressure of the liquid nitrogen to prevent overfilling and excessive pressure in the storage tank.
Tank Pressure Control: Tanks should be equipped with pressure control devices to ensure internal pressure remains within safe limits. Regularly inspect and maintain these devices to ensure proper operation.
Leak Detection and Alarm Systems: Tanks should be equipped with leak detection and alarm systems to promptly detect and alert for any tank leaks. Regularly inspect and maintain the leak detection equipment to ensure proper functioning.
Fire and Explosion Prevention Measures: A fire-resistant buffer zone should be established around the storage tank, away from ignition sources and flammable materials. The storage tank itself should implement fire and explosion prevention measures, such as fire-resistant coatings, explosion-proof devices, etc., to prevent fires and explosions.
Regular Inspections and Maintenance: Conduct regular inspections of the tank's exterior, valves, and fittings to ensure they are intact and undamaged. Perform regular leak detection and pressure tests to ensure the tank's safety performance meets requirements.
Safety Training and Awareness Enhancement: Conduct safety training for operators to enhance their awareness and ability in the safe operation of liquid nitrogen tanks. Regularly hold safety training and drills to prepare for emergencies.
Manage records and documents: Establish comprehensive management records and documentation, including tank usage, inspection logs, maintenance records, etc. Regularly review and update management records to ensure safe management and maintenance of the tanks.
Note that the above are some common protective procedures, which may vary depending on the type of storage tank and application. When using liquid nitrogen tanks, operate according to relevant specifications and standards, and consult with experts to ensure safety and effectiveness.

Protection techniques for liquid nitrogen tanks include the following:
Wear protective gear: When operating liquid nitrogen tanks, it is mandatory to wear appropriate protective gear, including gloves, protective clothing, and non-slip shoes. This gear protects the skin from the low temperature of liquid nitrogen and other hazards.
Avoid direct contact: Liquid nitrogen is extremely cold and can cause chilling. Hence, it should be avoided to come into direct contact with liquid nitrogen, especially the skin. Use tools or equipment for handling, and prevent direct hand contact with liquid nitrogen.
Note ventilation: In the operational area of the liquid nitrogen tank, 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 liquid nitrogen tank for leaks, equip with leak detection 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: Nitrogen liquid has a low boiling and freezing point, which is prone to cause fires. Measures such as installing fire walls around nitrogen liquid storage tanks and using fire-retardant coatings are taken to prevent fires from occurring and spreading.
Electrostatic Protection: The accumulation of static electricity in liquid nitrogen tanks may cause sparks, increasing the risk of fire. Measures such as using electrostatic conductive materials and anti-static equipment should be taken to reduce the accumulation and release of static electricity.
Regular inspections and maintenance: Conduct regular checks on the condition of liquid nitrogen tanks 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: Liquid nitrogen tanks produce waste gas during operation, and appropriate waste gas treatment measures must be taken.
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