Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinan Road, Economic and Technological Development Zone, Heze City. With a registered capital of 50 million yuan and total assets of 500 million yuan, the company has 7 business centers: boiler, deep-freezing container, pressure vessel, central air conditioning, engineering installation, international trade, and Internet of Things. It operates three factory sites on Jinan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters. The main workshop spans 83,000 square meters. It currently employs 710 staff, including 247 engineers and technicians, and 82 intermediate-level technicians. In December 2016, it was recognized as a "High-tech Enterprise" by the Science and Technology Department. In June 2021, it was named a "Specialized and New Enterprise of Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was identified as a "Gazelle Enterprise of Shandong Province" and in August 2022, it was recognized as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Protection techniques for liquid nitrogen tanks include the following:
Wear Protective Gear: When handling liquid nitrogen tanks, appropriate protective gear must be worn, including protective gloves, suits, 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. Therefore, avoid direct contact with liquid nitrogen, especially with the skin. Use tools or utensils for handling to prevent direct hand contact with liquid nitrogen.
Note Ventilation: In the operation 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, reducing the risk of fire and explosion.
Prevent Leaks: Regularly inspect the liquid nitrogen tanks for leaks and equip them with leak detection 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. To prevent and contain fires, firewalls and fire-retardant coatings are installed around nitrogen liquid storage tanks.
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 associated equipment, including valves, pipelines, pressure gauges, etc. Ensure that the equipment is in perfect condition, and promptly repair or replace any damaged parts.
Waste Gas Treatment: Nitrogen liquid storage tanks produce waste gas during operation, proper waste gas treatment must be implemented.

Liquid Oxygen Storage Tanks are equipment used for storing and supplying liquid oxygen. Liquid oxygen is the state of oxygen cooled below its boiling point, converting it into a liquid form. Liquid oxygen storage tanks are typically designed with double or multi-layer structures, filled with insulating material in between to minimize heat transfer and evaporation of the liquid oxygen.
Liquid Oxygen Storage Tanks Feature the Following Characteristics:
High Purity: The liquid oxygen storage tank contains high-purity liquid oxygen, typically exceeding 99.5% purity. This makes the liquid oxygen storage tank crucial for applications requiring high-purity oxygen, such as in medical, industrial, and research fields.
Low Temperature: As the boiling point of liquid oxygen is -183°C, liquid oxygen storage tanks must have excellent insulation properties to maintain the low temperature state of the liquid oxygen. Tanks are typically designed with double or multi-layer structures, filled with insulating material in the middle to reduce heat transfer and evaporation of the liquid oxygen.
High Pressure: Liquid oxygen tanks typically need to withstand high pressure to maintain their liquid state. The design and material selection of the tank must consider the pressure requirements of liquid oxygen to ensure the tank's safety and reliability.
Flammability: Liquid oxygen is highly flammable and supports combustion. Therefore, during the design and use of liquid oxygen storage tanks, fire prevention measures must be implemented to ensure no ignition sources are present around the tank and appropriate fire extinguishing equipment is available.
High Density: Liquid oxygen has a higher density, allowing liquid oxygen tanks to store more oxygen than gas oxygen tanks. This gives liquid oxygen tanks an advantage in applications requiring large amounts of oxygen supply, such as in the field.
The use of liquid oxygen tanks must strictly adhere to relevant safety regulations and operating guidelines to ensure the safe operation and use of the tank.

During the degreasing process of high-vacuum pipelines in low-temperature liquid storage tanks, the following steps can be taken:
Preparation: Ensure the cleanliness and readiness of the defatting equipment and tools. Check the pipeline system's connections and seals, ensuring there are no leaks.
Pipe Cleaning: Utilize suitable cleaning agents and tools to clean the pipes, removing surface dirt and grease. Methods such as mechanical brushing, high-pressure water jetting, or chemical cleaning can be employed.
De-greasing Process: Select an appropriate de-greaser and inject it into the pipeline system. The de-greaser can be an organic solvent or an alkaline solution, the choice depending on the pipeline material and type of dirt. Ensure the de-greaser thoroughly covers the inner pipeline wall and maintains a certain contact time.
Flush pipes: Drain the degreaser from the piping system and flush with clean water to remove any remaining degreaser and dirt. During the flushing process, high-pressure water or gas can be used for rinsing to ensure the interior of the pipes is clean.
Drying Pipeline: Utilize drying equipment or ventilation systems to evaporate or exhaust moisture within the pipeline, ensuring the interior wall is dry. Drying can be achieved using hot air or nitrogen.
Inspection and Testing: After degreasing, inspect and test the pipes to ensure cleanliness and sealing. Visual inspection, pressure testing, or other relevant tests can be conducted.
Be mindful that when descaling high-vacuum pipelines of low-temperature liquid storage tanks, adhere to the relevant safety operating procedures and guidelines. Ensure that operators possess the necessary safety awareness and operational skills to prevent accidental incidents.

Tanks are specialized storage equipment, and to ensure their safe operation, regular inspections and maintenance are required. The following are common inspection methods for tanks:
Visual Inspection: Regularly inspect the exterior of the storage tank, checking for leaks, corrosion, deformation, cracks, and other issues. Pay special attention to the integrity of the tank's joints, welds, and valves.
Pressure Test: Conduct pressure tests to check the tank's sealing performance and pressure resistance. Use a pressure gauge or pressure sensor for the tank's pressure testing to ensure the tank can withstand the designed pressure.
Ultrasonic Inspection: Ultrasonic inspection can be used to detect corrosion, cracks, and other issues in storage tank walls. By scanning the tank with an ultrasonic detection device, potential defects and problems are identified.
Magnetic Particle Inspection: Magnetic particle inspection is used to detect cracks in storage tank walls and the quality of welds. By applying magnetic particles to the surface of the tank and then using a magnetic particle inspection device to observe for particle accumulation, it can be determined if there are any cracks or weld issues.
Environmental Monitoring: Conduct regular environmental monitoring around the storage tanks, including checking gas concentrations and temperatures, to ensure the safety of the surrounding environment.
It is important to note that tank inspections should be conducted by a certified inspection agency 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.
Our company places great emphasis on technological innovation and R&D design. We possess 1 municipal-level enterprise technology center in Heze City, equipped with testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and more. We have over 600 units of various 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 we have developed, such as welding technology for 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 key projects, and Heze City innovative and excellent projects. We have accumulated 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 developed deep cryogenic container processing technology using the international plasma arc + wire filling tungsten inert gas arc welding (PAW-GTAW) technique. After being appraised as a provincial-level scientific and technological achievement, the technology has reached an international level in the field of deep cryogenic container manufacturing. Choose Zhongjie Special Equipment, let's join hands to create brilliance together!