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 license, and GB2/Class, GC2/Class pressure pipeline installation license, as well as mechanical and electrical equipment installation contracting资质. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and a council member 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 U.S. ASME/U2 certification.
Liquid nitrogen tanks are equipment used for storing liquid nitrogen, widely applied in the following fields:  Frozen Food and Cold Chain Logistics: Liquid nitrogen tanks are utilized in the frozen food and cold chain logistics industry to freeze or refrigerate food and other perishable items, extending their shelf life and freshness. The low temperature of liquid nitrogen can rapidly freeze food, prevent bacterial growth, and preserve food quality. Bioscience Preservation: Liquid nitrogen tanks are extensively used for preserving biological samples, cells, tissues, and more. The low temperature of liquid nitrogen effectively protects the integrity and viability of biological materials, used in medical research, biomedicine engineering, and transplantation fields. Laboratory Research: In scientific research and laboratories, liquid nitrogen tanks are used 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 employed in metalworking and welding for cooling and controlling metal temperatures. Liquid nitrogen can rapidly cool metal, improve its hardness and strength, and reduce 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 the fields of frozen food, laboratory research, metalworking, and gas supply, providing storage and supply functions for liquid nitrogen at application sites.

When cleaning low-temperature liquid storage tanks, the following steps should be taken:
Safety Preparations: Prior to cleaning, ensure there are no remaining liquids or gases inside the tank, and that the tank has been properly drained and vented. Wear appropriate personal protective equipment, such as protective suits, gloves, and safety shoes.
Cleaning Agent Selection: Choose a cleaner suitable for low-temperature environments and liquid storage tank materials. Common cleaners include acidic and alkaline solutions, organic solvents, or specialized cleaners. Select an appropriate cleaner based on the tank material and the nature of the contaminants.
Washing Process: Inject cleaning agent into the storage tank and clean the inner wall using appropriate tools (such as a sprayer, brush, or high-pressure water). Multiple washes can be performed as needed to ensure pollutants are removed.
Rinsing and Discharge: After cleaning, rinse with clean water or an appropriate solvent to remove any cleaning agents and residues. Ensure the tank is dry inside, and discharge the rinsing fluid into a suitable treatment system.
Inspection and Verification: After cleaning, inspect the tank to ensure no residues of contaminants remain inside. Appropriate testing equipment or methods, such as optical inspection, chemical analysis, or ultrasonic testing, can be used to verify the cleaning effectiveness.
Be mindful that when cleaning low-temperature liquid storage tanks, it's crucial to adhere to relevant safety regulations and operational guidelines. Liquid storage tanks are typically highly flammable and exhibit low-temperature characteristics, so operators must strictly follow safety procedures to ensure the safety of personnel and equipment. During the cleaning process, attention should be given to prevent leaks of cleaning agents and contaminants, and appropriate measures should be taken for handling and disposal.

Maintenance and care of liquid nitrogen tanks are crucial for ensuring safe operation and extending their lifespan. Here are the maintenance and care methods for liquid nitrogen tanks:
Regular Inspections: Conduct regular inspections of the liquid nitrogen tank's exterior and interior, including checking for leaks, corrosion, wear, or other damage. Pay special attention to inspecting the tank's interfaces, valves, and pipelines, ensuring they are functioning properly.
Cleaning and Defrosting: Regularly clean the exterior surface of the liquid nitrogen tank to remove dust and dirt. If there is ice or frost inside the tank, defrosting is required to maintain the normal operation of the tank.
Level Monitoring: Regularly monitor the liquid nitrogen tank's level to ensure the stored amount is within a safe range. In case of abnormal levels, adjust or replenish liquid nitrogen promptly.
Regular maintenance and replacement of components: Conduct regular maintenance and replacement of critical parts of the liquid nitrogen tank, such as safety valves, pressure sensors, and temperature sensors, to ensure their proper operation and accuracy.
Inspect Insulation: Regularly inspect the liquid nitrogen tank's insulation to ensure its integrity and insulating properties. If any damage or aging of the insulation is found, it should be repaired or replaced promptly.
Regular Calibration: Regularly calibrate the gauges and sensors of liquid nitrogen tanks to ensure accuracy and reliability. Calibration should be conducted according to relevant standards and specifications.
Safety Training and Operating Procedures: Conduct regular safety training for liquid nitrogen tanks to ensure operators are familiar with the safe operating procedures and emergency response measures.
Note that maintenance and care of liquid nitrogen tanks should be performed by trained and authorized personnel. Adhere to relevant safety regulations and operation guidelines to ensure the safety and effectiveness of maintenance work.

Liquid oxygen tanks are used for storing and supplying liquid oxygen as fuel and an oxidizer, playing a crucial role in launch propulsion systems, etc. Industrial Production: Liquid oxygen is used as an oxidizer in industrial production for processes such as combustion, oxidation, and oxygen supply. Liquid oxygen tanks are used to store and supply liquid oxygen to meet the demands of industrial applications like metal cutting, welding, and chemical reactions. Equipment: Liquid oxygen tanks are utilized in equipment to supply oxygen, such as oxygen therapy, oxygen inhalation, and operating rooms. These tanks provide high-purity oxygen while maintaining a低温 state to meet the oxygen requirements of the equipment. Laboratory Research: Liquid oxygen tanks are used in scientific research and laboratories to provide liquid oxygen as experimental materials and reagents. The low temperature and high purity of liquid oxygen make it widely applicable in laboratories for fields such as materials science, chemical reactions, and biomedical research. In summary, liquid oxygen tanks are vital in various fields including industrial production, equipment, and laboratory research, providing storage and supply functions for liquid oxygen at the application sites.
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