Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, an A2-grade pressure vessel manufacturing license, an A2-grade pressure vessel design license, a B-grade boiler installation license, and GB2/GB3-grade pressure pipeline installation licenses, as well as a mechanical and electrical equipment installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and a director unit of the Shandong Equipment Manufacturing Association. The company has also passed certifications for the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System, and the American ASME/U2 certification.
The safety distance between liquid oxygen tanks and buildings is typically dictated by relevant safety standards and regulations to ensure the safe distance and fire separation between them. The following is a reference for the general safety distance between liquid oxygen tanks and buildings:
Horizontal Clearance: The horizontal clearance between the liquid oxygen tank and the building is typically required to maintain a certain distance to prevent the tank from causing danger to the building in case of leakage or accidents. The specific clearance distance should be determined based on factors such as the tank's capacity, pressure, and the nature of the building, with a general recommendation to maintain a safe distance.
Vertical Clearance: The vertical clearance between the liquid oxygen tank and the structure must also meet the relevant safety requirements. This is to prevent the tank from causing danger to the structure in case of leakage or accidents. Specific clearance requirements will be determined based on factors such as the tank's capacity, pressure, and the height of the structure, generally recommending maintaining a certain safety distance.
Fireproof separation: Liquid oxygen has a high oxygen content and flammability. In the event of a leak or accident, it may cause a fire. Therefore, a certain fireproof separation is required between the liquid oxygen storage tank and the building to ensure that the fire does not spread or pose a danger to the building. Specific fireproof separation requirements

The safe operation of low-temperature liquid storage tanks primarily involves the following key aspects:
Tank design and material selection: The tank design must comply with relevant safety standards and regulations, capable of withstanding the pressure and temperature of low-temperature liquids. Select suitable materials, such as stainless steel, aluminum alloy, etc., to ensure the tank's corrosion resistance and low-temperature performance.
Insulation and Protection Measures: Low-temperature liquid storage tanks should be equipped with effective insulation to minimize heat transfer and evaporation of the liquid. The selection and installation of the insulation should comply with relevant standards and requirements. Additionally, protective measures such as anti-freezing and explosion-proof measures should be taken to ensure the safe operation of the tank.
Pressure Control and Safety Valves: Low-temperature liquid storage tanks should be equipped with reliable pressure control systems and safety valves to ensure the pressure within the tank remains within a safe range. The pressure control system should be capable of promptly detecting and adjusting the pressure inside the tank to prevent risks from excessive or insufficient pressure.
Leak and Fire Protection: Low-temperature liquids are highly flammable, so measures should be taken to prevent leaks and fires. Tanks and related pipelines must have good sealing and should be regularly inspected and maintained to prevent leaks. Additionally, appropriate fire protection facilities and firefighting equipment should be provided to address fire risks.
Safety Operation and Training: Operators must undergo relevant safety training, familiarize themselves with the safe operation procedures and emergency response measures for low-temperature liquid storage tanks. Adhere to correct operational steps to ensure safe operation.
Regular inspections and

When storing liquid nitrogen in low-temperature storage tanks, the following points should be noted:
Protective Gear: When operating low-temperature tanks, it is mandatory to wear appropriate protective gear, including gloves, protective suits, and anti-slip shoes. This equipment 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, avoid direct contact with liquid nitrogen, especially with the skin. Use tools or equipment for handling to prevent direct hand 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 low-temperature 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 harm to personnel and the environment due to the leakage of liquid nitrogen.
Fire Prevention Measures: Liquid nitrogen has a low boiling and freezing point, which can easily cause fires. Measures such as setting up fire barriers around low-temperature storage tanks and using fire-retardant coatings are taken to prevent the occurrence and spread of fires.
Electrostatic Protection: Electrostatic buildup in low-temperature storage tanks may cause sparks, increasing the risk of fire. Measures such as using electroconductive materials and antistatic equipment should be taken to reduce the accumulation and discharge of static electricity.
Regular Inspections and Maintenance: Conduct regular checks on the condition of low-temperature storage tanks and related equipment, including valves, pipes, pressure gauges, etc. Ensure that the equipment is in perfect condition without any damage, and promptly repair or replace any damaged parts.
Waste Gas Treatment: Low-temperature storage tanks produce waste gas during operation, and appropriate waste gas treatment measures must be taken to minimize environmental impact.
Above are the precautions to be taken when storing liquid nitrogen in a low-temperature storage tank, ensuring operational safety and the normal operation of the tank. During the operation, strict adherence to relevant operational procedures and safety requirements should be maintained to avoid accidents.

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, checking for leaks, corrosion, wear, or other damage. Pay special attention to the tank's interfaces, valves, and pipelines to ensure they are functioning properly.
Cleaning and Defrosting: Regularly clean the exterior surface of the liquid nitrogen storage 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 storage is within a safe range. If an abnormal level is detected, adjust or replenish the liquid nitrogen promptly.
Regular inspection and replacement of parts: Conduct regular inspections and replacements of critical components of liquid nitrogen storage tanks, such as safety valves, pressure sensors, and temperature sensors. Ensure the normal operation and accuracy of these parts.
Inspect Insulation Layer: Regularly inspect the liquid nitrogen tank's insulation layer to ensure its integrity and insulating performance. If damage or aging of the insulation layer is found, it must be repaired or replaced promptly.
Regular Calibration: Regularly calibrate the gauges and sensors of liquid nitrogen tanks to ensure their accuracy and reliability. Calibration should be performed 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 conducted by trained and authorized personnel. Adhere to relevant safety standards and operational guidelines to ensure the safety and effectiveness of maintenance activities.
Our company attaches great importance to technological innovation and R&D design. We have one municipal-level enterprise technology center in Heze City, equipped with non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and other testing facilities. We have over 600 types of equipment, including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, and more. The key products and technologies we have developed, such as welding of temperature and pressure vessels, biomass boiler emission reduction, and waste heat utilization, have successively been included in multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, Shandong Provincial key projects, and Heze City innovative and excellent projects. We have cumulatively obtained 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. The technical team of our company, in collaboration with Professor Li Yajiang of Shandong University, has jointly developed deep cryogenic container processing technology, which adopts the international plasma arc + filler wire tungsten inert gas arc welding (PAW-GTAW) technology. After being appraised as a provincial-level scientific and technological achievement, the technology level has reached the international standard in the field of deep cryogenic container manufacturing. Choose Zhongjie Special Equipment, let's create brilliance together!