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-freeze container, pressure vessel, central air conditioning, engineering installation, international trade, and Internet of Things. It has three factory areas 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. Currently, there are 710 employees, 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 liquid oxygen storage tank possesses the following characteristics:
High Purity: The liquid oxygen tanks store high purity liquid oxygen, typically exceeding 99.5% purity. This makes the liquid oxygen tanks essential for applications requiring high purity oxygen, such as 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 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 supports combustion. Consequently, fire prevention measures must be implemented in the design and operation of liquid oxygen storage tanks to ensure there are no ignition sources nearby and appropriate fire-fighting equipment is available.
High Density: Liquid oxygen has a higher density than gaseous oxygen, allowing liquid oxygen tanks to store more oxygen. This gives liquid oxygen tanks an advantage in applications requiring large oxygen supplies, such as in the field of .
Corrosiveness: Liquid oxygen has certain corrosive properties.

When selecting a liquid oxygen storage tank with a medical oxygen concentrator, consider the following factors:
Requirement: First, determine the oxygen demand of the institution or individual. Select the appropriate oxygen concentrator model and specification based on the required oxygen flow rate and pressure.
Safety and Reliability: Ensure the selected oxygen concentrator has high safety and reliability. Choose products that comply with relevant standards and regulations, featuring safety functions such as overpressure protection, leakage protection, and overload protection.
Ease of operation: Select an oxygenator that is simple to operate and user-friendly. Consider the methods for adjusting oxygen flow and concentration, as well as the clarity and readability of the operating interface.
Quality and Reputation: Choose an oxygen concentrator with excellent quality and reliability. Refer to customer reviews, word-of-mouth, and institutional endorsements when selecting a product.
Maintenance and After-Sales Service: Understand the maintenance requirements and after-sales support for the oxygenator. Ensure timely access to repairs and technical support to guarantee the proper operation and maintenance of the oxygenator.
Cost-effectiveness: Choose a product with good cost-performance ratio, considering the price, performance, and features of the oxygenator. Select an oxygenator that suits your actual needs and budget.
Be mindful that when selecting a liquid oxygen tank with a medical oxygen generator, adhere to the relevant equipment procurement regulations and standards. It's advisable to consult with equipment suppliers or relevant institutions to ensure the oxygen generator chosen meets the requirements and safety standards.

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.
Cleaner 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 the appropriate cleaner based on the tank's material and the nature of the contaminants.
Cleaning Process: Inject the cleaning agent into the tank and clean the interior walls using appropriate tools (such as sprayers, brushes, or high-pressure water). Multiple cleanings can be performed as needed to ensure removal of contaminants.
Washing and Discharging: After cleaning, rinse with clean water or an appropriate solvent to remove all cleaning agents and residues. Ensure the tank is dry and discharge the rinse water into an appropriate 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 typically possess high flammability and 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.

Nitrogen charging of liquid nitrogen tanks refers to the process of injecting nitrogen gas into the tank to increase the concentration and pressure of nitrogen inside, in order to meet certain safety requirements and operational objectives. Here are some precautions to consider when nitrogen charging liquid nitrogen tanks:
Safe Operation: Prior to conducting nitrogen charging operations on liquid nitrogen tanks, it is mandatory that operators possess relevant safety knowledge and operational skills. Operators should wear appropriate personal protective equipment, such as safety goggles, gloves, and protective clothing.
Nitrogen Quality: Utilize high-purity nitrogen for inerting operations to ensure the quality and purity of the nitrogen. Low-purity nitrogen may contain impurities or oxygen, which could adversely affect the liquid nitrogen within the storage tank.
Nitrogen Inerting Speed Control: During the nitrogen inerting process, the speed of nitrogen inerting should be controlled to avoid being too fast or too slow. Too fast a nitrogen inerting speed can lead to excessive internal pressure within the tank, while too slow a speed can result in extended inerting time.
Pressure Monitoring: During the nitrogen blanketing process, regular monitoring of the internal pressure changes in the storage tank is required. Ensure the internal pressure of the tank is within the safe range and adjust as necessary.
Temperature Control: During the nitrogen purge process, attention should be given to controlling the temperature of the storage tank. The low temperature of liquid nitrogen can lead to condensation and dew on the tank and pipelines. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and dew from occurring.
Post-nitrogen flushing treatment: Upon completion of the nitrogen flushing operation, promptly shut down the nitrogen flushing unit and inspect and clean the tank. Ensure that no residual nitrogen or impurities are left inside the tank.
It is important to note that nitrogen flushing operations for liquid nitrogen tanks must strictly adhere to relevant safety standards.
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 testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and more. We have over 600 pieces 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 others. Our key products and technologies, such as welding for temperature and pressure vessels, biomass boiler emissions reduction, and waste heat utilization, have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology scientific and technological 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. Our technical team, in collaboration with Professor Yajiang Li from Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + wire filling tungsten inert gas arc welding (PAW-GTAW) technique. The provincial-level scientific and technological achievement identification has confirmed that our technology level in deep cryogenic container manufacturing has reached international standards. Choose Zhongjie Special Equipment, let's create brilliance together!