Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, A2-grade pressure vessel manufacturing license, A2-grade pressure vessel design license, B-grade boiler installation, and GB2/Class, GC2/Class pressure pipeline installation licenses, as well as equipment and machinery installation contracting qualifications. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the理事 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.
Material control for low-temperature liquid storage tanks is a crucial aspect in ensuring safety and reliability. Here are some common material control measures:
Material Selection: Choose materials suitable for low-temperature environments, such as low-temperature alloy steel, stainless steel, etc. These materials offer excellent low-temperature resistance and crack resistance, maintaining strength and toughness under low-temperature conditions.
Material Quality Control: Ensure the selected materials meet relevant standards and specifications. Conduct chemical composition analysis, mechanical property tests, and impact tests on the materials to ensure their performance meets design requirements.
Welding Material Selection: Choose welding materials suitable for low-temperature environments, such as low-temperature welding rods or welding wires. The welding materials should match the tank material, offering excellent welding properties and crack resistance.
Welding Process Control: Control welding process parameters such as welding current, voltage, and welding speed to ensure the quality and reliability of weld joints. Methods with low heat input, such as pulsed welding and laser welding, can reduce the temperature gradient and residual stress in the heat-affected zone of welding.
Corrosion Prevention Measures: Apply corrosion-resistant treatments to the internal and external metal surfaces of storage tanks to extend their service life. Options include corrosion-resistant coatings and paints to protect the metal structure of the tank from corrosion.
Material Performance Monitoring: Regularly conduct performance monitoring of storage tank materials, such as mechanical property tests,

To prevent the explosion of liquid oxygen tanks, the following measures can be taken:
Regular inspections and maintenance: Conduct regular inspections and maintenance of the liquid oxygen tank, including checking the tank's exterior, welds, valves, and fittings, to ensure they are intact and undamaged. Regularly clean the tank to remove any impurities and dirt adhering to its surface.
Pressure Control: Tanks should be equipped with pressure control devices to ensure internal tank pressure remains within safe limits. Regularly inspect and adjust the pressure control devices to ensure proper functioning.
Temperature Control: The liquid oxygen tank should be maintained within an appropriate temperature range to prevent excessive heat from causing pressure increase. Ensure the tank's insulation is intact to minimize heat conduction and loss.
Fire Prevention Measures: Liquid oxygen has a high oxygen content and flammability, hence stringent fire prevention measures are required. A fire-resistant buffer zone should be established around the storage tank, with smoking and open flames prohibited. Ensure a sufficient fire-resistant distance between the tank and other facilities.
Pressure Relief Devices and Safety Valves: Liquid oxygen storage tanks should be equipped with pressure relief devices and safety valves to prevent overpressure and sudden pressure increases. Regularly inspect and test the operational status of the pressure relief devices and safety valves to ensure their proper functioning.
Tank Operation Standards: Adhere strictly to the operational specifications and safety requirements for liquid oxygen tanks. Operators must be trained and familiar with the tank's characteristics and operation techniques. Avoid operational errors and violations.
Emergency Preparedness: Establish emergency response plans and conduct drills to address potential accidents. Train operators in emergency response capabilities to ensure timely and effective handling.

To extend the service life of low-temperature liquid storage tanks, the following measures can be taken:
Regular Inspections and Maintenance: Conduct regular visual inspections of the tank, including the shell, welds, valves, and fittings. Check for any abnormalities such as cracks, corrosion, or deformation, and promptly repair or replace damaged parts.
Maintain Insulation: Insulation is crucial for the thermal preservation of low-temperature liquid storage tanks. Regularly inspect the integrity and insulating properties of the insulation, repair or replace damaged insulation materials to ensure the tank's insulating effectiveness.
Control temperature and pressure: The temperature and pressure of low-temperature liquid storage tanks should be maintained within a safe range. Avoid extremes of temperature and pressure that could damage the tank. Implement appropriate cooling or heating measures to ensure stable temperature and pressure of the liquid.
Corrosion Protection: The tank's shell and internal structure should be protected against corrosion and oxidation. Regularly inspect and maintain the protective coating to ensure it remains intact.
Avoid excessive pressure and overfilling: Prevent the internal pressure of the tank from being too high or too low, as well as overfilling with liquid. Excessive pressure and overfilling can lead to structural破裂 or damage to the tank.
Regular cleaning and draining: Periodically clean the interior of the tank to remove accumulated impurities and dirt. Regularly drain to prevent damage to the tank from杂质 and sediments in the liquid.
Safe Operation and Training: Ensure operators are knowledgeable and skilled in the safe handling of low-temperature liquid storage tanks. Enhance safety training to boost operators' awareness and emergency response capabilities.
Manage records and documents: Establish comprehensive management records and documentation, including the usage of storage tanks.

Liquid nitrogen tanks are devices used for storing liquid nitrogen and are widely applied in the following fields: Frozen Food and Refrigerated Logistics: Liquid nitrogen tanks are used in the frozen food and refrigerated logistics industry to freeze or refrigerate food and other perishable items, extending their shelf life and maintaining freshness. The low temperature of liquid nitrogen can quickly freeze food, preventing bacterial growth and spoilage. Biological Sample Storage: Liquid nitrogen tanks are extensively used in the field for freezing and preserving biological samples, cells, tissues, and more. The low temperature of liquid nitrogen effectively preserves the integrity and viability of biological materials, used in medical research, biomedical engineering, and transplantation, among others. Laboratory Research: Liquid nitrogen tanks are utilized in scientific research and laboratories to provide liquid nitrogen as a coolant and freezing medium. The low temperature of liquid nitrogen can be used for cooling laboratory equipment, material research, superconducting electronics, and low-temperature physics. Metalworking and Welding: Liquid nitrogen tanks are used in metalworking and welding for cooling and controlling the temperature of metals. Liquid nitrogen can rapidly cool metals, improving their hardness and strength, and reducing deformation and stress. Gas Storage and Supply: Liquid nitrogen tanks are also used for storing and supplying nitrogen gas. Liquid nitrogen can be evaporated into gaseous nitrogen for applications such as gas shielded welding, gas fire suppression systems, gas analysis, and laboratory gas supply. In summary, liquid nitrogen tanks are widely used in frozen food, laboratory research, metalworking, and gas supply, providing storage and supply functions for liquid nitrogen at application sites.
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