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 storage tanks, oxygen/nitrogen/argon storage tanks, and CO2 storage tanks; pressure vessel products including denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment; 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.
Liquid nitrogen storage tanks are used for storing and transporting liquid nitrogen. To ensure safe operation, here are some common operational protection procedures for liquid nitrogen storage tanks:
Tank Installation: Tanks should be installed on a solid and level foundation, away from fire sources and flammable materials. Good ventilation around the tank is essential to prevent gas accumulation. Adequate safety distances should be maintained between the tank and other equipment and buildings.
Liquid Nitrogen Filling: When filling with liquid nitrogen, use appropriate liquid nitrogen transfer equipment to avoid direct contact. During the filling process, monitor and control the flow and pressure of liquid nitrogen to prevent over-filling and excessive tank pressure.
Tank Pressure Control: Tanks should be equipped with pressure control devices to ensure internal tank pressure remains within a safe range. Regularly inspect and maintain these devices to ensure proper operation.
Leak Detection and Alarm Systems: Storage tanks should be equipped with leak detection and alarm systems to promptly detect and alert of any tank leaks. Regularly inspect and maintain the leak detection equipment to ensure proper functioning.
Fire and explosion prevention measures: A fire-resistant isolation area should be set around the storage tank, away from fire sources and flammable materials. The tank itself should implement fire and explosion prevention measures, such as fire-resistant coatings and explosion-proof devices, to prevent fires and explosions.
Regular Inspections and Maintenance: Conduct regular checks of the tank's appearance, valves, and connections 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 proficiency 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 documents, including tank usage, inspection logs, maintenance records, etc. Regularly review and update the management records to ensure safe management and maintenance of the tanks.
It's important to note that the above are common protective procedures, but specific procedures may vary depending on the type of tank and application. When using liquid nitrogen tanks, operate according to relevant regulations and standards, and consult with experts to ensure safety and effectiveness.

During the operation of low-temperature storage tanks, it is indeed necessary to avoid the occurrence of wrinkling. Wrinkling refers to the phenomenon of creases or deformation in the tank walls, which may lead to a decrease in the structural strength of the tank and even cause leaks or ruptures.
Below are some precautions to avoid tank squeezing in low-temperature storage:
Tank Design: Select an appropriate tank design that can withstand the pressure and weight of low-temperature liquids. The tank's wall thickness and supporting structure should comply with relevant standards and regulations.
Material Selection: Choose materials suitable for low-temperature environments with adequate strength and low-temperature resistance. Common materials include low-temperature steel, stainless steel, etc.
Insulation Layer for Storage Tank: The design and construction of the insulation layer must meet the requirements to ensure effective reduction of heat conduction and temperature variation. The materials and thickness of the insulation layer should be selected based on specific conditions.
Tank Operation: During the loading and unloading of liquids in the tank, it is essential to avoid rapid or excessive fluid flow to minimize impact and stress concentration on the tank walls.
Tank Maintenance: Regularly inspect and maintain the structure and insulation of the tank to ensure it remains undamaged. Any anomalies or damage should be repaired or replaced promptly.
Temperature Control: During the operation of low-temperature liquid storage tanks, it is essential to strictly control the temperature difference between the inside and outside of the tank to avoid excessive temperature fluctuations and thermal stress.
In summary, preventing tank deformation at low temperatures hinges on rational design, material selection, proper installation and maintenance of the insulation layer, and strict control of temperature variations. Regular inspections and maintenance are crucial for ensuring the safe operation of the tank.

Tanks are specialized storage equipment that require regular inspections and maintenance to ensure safe operation. The following are common inspection methods for tanks:
Appearance Inspection: Regularly inspect the exterior of the storage tank for any leaks, corrosion, deformation, cracks, and other issues. Pay special attention to the integrity of the tank's interfaces, welds, and valves.
Pressure Test: Conduct pressure tests to inspect the tank's sealing performance and pressure resistance. Use a pressure gauge or pressure sensor to perform pressure tests on the tank, ensuring it can withstand the designed pressure.
Ultrasonic Testing: Ultrasonic testing is used to detect corrosion, cracks, and other issues in storage tank walls. By scanning the tank with an ultrasonic probe, potential defects and problems are identified.
Magnetic Particle Inspection: Magnetic particle inspection is used to detect cracks and the quality of welds in storage tank walls. By applying magnetic particles to the tank surface and then observing for particle accumulation using a magnetic particle inspection device, it can be determined if there are any cracks or welding issues.
Environmental Monitoring: Regularly monitor the environment around storage tanks, including parameters such as gas concentration and temperature, to ensure the safety of the surrounding environment.
It is important to note that tank inspections should be conducted by certified inspection agencies or qualified inspectors. The frequency and methods of inspection should be determined based on the tank's usage, size, and relevant regulatory requirements. Regular inspections and maintenance can help identify potential issues early on, ensuring the safe operation of the tank.

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 can protect the skin from the low temperature of liquid nitrogen and other hazards.
Avoid direct contact: Liquid nitrogen is extremely cold and can cause frostbite. Therefore, it is essential to avoid direct contact with liquid nitrogen, especially with the skin. Use tools or equipment for handling to prevent direct hand contact with liquid nitrogen.
Note ventilation: In the operational area of the liquid nitrogen tank, ensure adequate ventilation 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 liquid nitrogen tanks for leaks, equip with leak detectors and alarm systems. In case of a leak, take immediate action to control and repair it. Avoid harm to personnel and the environment caused by liquid nitrogen leaks.
Fire Prevention Measures: Nitrogen liquid has a low boiling and freezing point, which is prone to causing fires. Measures such as setting up fire barriers around nitrogen liquid storage tanks and using fire-retardant coatings are taken to prevent fires from occurring and spreading.
Static protection: The accumulation of static electricity in liquid nitrogen tanks may cause sparks, increasing the risk of fire. Measures such as using static-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 the equipment is in perfect condition, and promptly repair or replace any damaged parts.
Waste Gas Treatment: Liquid nitrogen storage tanks will generate waste gas during use, which must be properly treated.
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