Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan 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: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and the Internet of Things. It has three manufacturing sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop spanning 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 identified as a "Specialized and New Enterprise in Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
The testing and maintenance procedures for liquid oxygen storage tanks encompass the following aspects:
Visual Inspection: Regularly conduct visual inspections of the liquid oxygen storage tank, including checking for corrosion, wear, and leakage on the tank surface to ensure the tank's exterior integrity.
Pressure Testing: Regular pressure tests of the liquid oxygen storage tank are conducted to assess the tank's pressure resistance. The tests should be performed in accordance with relevant standards and regulations, ensuring the tank can withstand the designed working pressure.
Leak Detection: Regularly conduct leak detection on liquid oxygen tanks, including using leak detection equipment to inspect the tanks, to ensure the tanks have good sealing performance and no leakage issues.
Cleaning and Coating Protection: Regularly clean and apply protective coatings to liquid oxygen tanks to prevent corrosion and oxidation. Use appropriate cleaning agents during cleaning and avoid substances that react with liquid oxygen. Protective coatings can be applied using anti-corrosion coatings or protective agents.
Regular Maintenance: Perform regular maintenance on liquid oxygen tanks, including inspections and replacement of seals, valves, safety devices, etc., to ensure proper operation and safety reliability.
Safety Training and Operating Procedures: Conduct safety training for personnel using liquid oxygen tanks to ensure they are aware of the safe operating procedures and precautions, preventing operational errors and accidents.
Documentation and Record Management: Establish test and maintenance records for liquid oxygen storage tanks, including test results, maintenance logs, and inspection records, for traceability and management purposes.
Note that testing and maintenance of liquid oxygen tanks should be performed by trained personnel and in accordance with relevant safety operating procedures and standards. Additionally, a specific testing and maintenance plan should be developed based on the tank's condition and usage requirements, and executed as scheduled.

The temperature difference between the interior and exterior of a low-temperature liquid storage tank depends on various factors, including the tank's design, insulation performance, the temperature of the liquid, and the ambient temperature. Generally, the temperature inside the low-temperature liquid storage tank is much lower than that of the external environment.
Low-temperature liquid storage tanks are commonly used for storing liquefied nitrogen, oxygen, argon, and other low-temperature liquids. These liquids have very low boiling points, usually below -100 degrees Celsius. To maintain the low temperature of the liquids, the tanks must have excellent insulation to minimize heat transfer and evaporation loss.
Low-temperature liquid storage tanks typically offer a smaller temperature variance. Generally, the internal temperature of the tank can be maintained near the boiling point of the liquid, usually several dozen degrees cooler than the ambient external temperature. The specific temperature variance depends on the tank's design and insulation properties, as well as the characteristics of the liquid.
Note that the temperature differences in low-temperature liquid storage tanks may change over time. As time passes, the performance of the insulation material may be affected by wear or aging, leading to an increase in temperature differences. Therefore, regular inspection and maintenance of the tank's insulation layer are crucial to ensure its effective and stable insulating performance.

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 the evaporation of liquid oxygen.
Liquid Oxygen Storage Tanks Feature the Following:
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, the liquid oxygen storage tank must have excellent thermal 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 between to minimize 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 can support combustion. Therefore, fire prevention measures must be implemented in the design and operation of liquid oxygen storage tanks, ensuring no ignition sources are present around the tank and that appropriate fire extinguishing equipment is provided.
High Density: Liquid oxygen has a higher density, allowing liquid oxygen tanks to store more oxygen compared to gas oxygen. This gives liquid oxygen tanks an advantage in applications requiring large oxygen supplies, 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.

Proper placement of liquid oxygen tanks is a crucial measure to ensure they pose no danger to the surrounding environment and personnel during use. The following are the safety requirements for the placement of liquid oxygen tanks:
Safety Distance: Liquid oxygen storage tanks should maintain a certain distance from other buildings and equipment. This is to ensure effective control and minimize the impact on the surrounding environment in the event of a leak or fire.
Fire and explosion prevention measures: Liquid oxygen tanks should be placed in fire-resistant areas, away from open flames, high-temperature sources, and flammable materials. The surrounding area should be equipped with fire and explosion prevention facilities, such as fire extinguishers, foam sprinkler systems, etc., to address potential fire risks.
Level placement: Liquid oxygen tanks should be placed on a solid, flat foundation to ensure stability. The bottom of the tank should make full contact with the ground to avoid tilting or shaking of the tank.
Ventilation Requirements: Liquid oxygen tanks should be placed in well-ventilated areas to ensure the normal circulation of gas emissions and oxygen supply. There should be no obstructions around the tank that hinder gas flow.
Identification and Warnings: Liquid oxygen tanks must be clearly marked with information such as the storage medium, capacity, and pressure. Warning signs and safety cautions should be placed in the surrounding area to alert personnel to the presence and potential hazards of the liquid oxygen tank.
Regular inspections and maintenance: Liquid oxygen tanks should be regularly inspected and maintained, including checking the tank's appearance, sealing, and corrosion prevention measures. Any issues found should be promptly repaired or replaced to ensure proper operation and safety.
It's important to note that the safety requirements for the placement of liquid oxygen tanks may vary depending on different regions and industries. When placing liquid oxygen tanks, it's essential to comply with relevant regulations, standards, and safety procedures, and to establish appropriate safety measures based on the actual situation. If you're unfamiliar with or have doubts about the safety placement requirements, it's advisable to consult with experts or relevant institutions.
Our company attaches great importance to technological innovation and R&D design. We possess 1 municipal enterprise technology center in Heze City, and have established testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc. We are equipped with over 600 various instruments and 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 temperature-pressure vessel welding, biomass boiler emission reduction, and waste heat recovery, have successively been selected for multiple Shandong Province Ministry of Industry and Information Technology science and technology projects, key provincial projects, and Heze City innovation and excellence projects. We have accumulated a total of 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. Our technical team, in collaboration with Professor Yajiang Li of Shandong University, has jointly developed deep cryogenic container processing technology using the international plasma arc + filler wire argon arc welding (PAW-GTAW) technology. This technology has been appraised as reaching an international level in the field of deep cryogenic container manufacturing at the provincial level. Choose Zhongjie Special Equipment, and let's join hands to create brilliance together!