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 operates seven business centers: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It has three manufacturing sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters, with the main workshop spanning 83,000 square meters. The company currently employs 710 staff, including 247 engineers and technicians, and 82 intermediate-level technical personnel. 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 reasons for occasional venting of liquid oxygen storage tanks are primarily to maintain the safe pressure range within the tank and to prevent excessive pressure buildup. Here are several situations where occasional venting of liquid oxygen storage tanks occurs:
Pressure Control: During operation, the pressure inside a liquid oxygen tank can fluctuate due to evaporation of the liquid oxygen and temperature changes. To maintain a safe pressure range within the tank, regular venting is necessary to control the pressure within the safe limits.
Prevent Overpressure Accumulation: During oxygen filling or use, external factors or operational errors may cause the pressure inside the liquid oxygen tank to exceed safe limits. To prevent overpressure accumulation, timely venting is required to reduce the pressure within the tank.
Prevent Gas Accumulation: There may be some gas impurities, such as air and water vapor, in the liquid oxygen tank. These gases will condense into liquids or solids at the low temperatures of liquid oxygen, potentially blocking pipes or affecting the normal operation of the tank. Regular venting can expel these impurities, maintaining the tank's cleanliness and unobstructed flow.
It is important to note that the degassing operation of liquid oxygen should be performed by authorized personnel and strictly adhere to the relevant operational procedures and safety measures. During the degassing process, precautions should be taken to prevent any leakage of liquid oxygen and contact with it, ensuring the safety and reliability of the operation.

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 in the tank, and that it has been properly emptied 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 cleaning agents. Select an 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 inner walls using appropriate tools (such as a sprayer, brush, or high-pressure water). Multiple cleanings can be performed as needed to ensure removal of contaminants.
Washing and Discharge: After cleaning, rinse with fresh water or an appropriate solvent to remove cleaning agents and residues. Ensure the tank interior is dry and discharge the rinse fluid into an appropriate treatment system.
Inspection and Verification: After cleaning, inspect the tank to ensure no residual contaminants remain inside. Appropriate detection equipment or methods, such as optical inspection, chemical analysis, or ultrasonic testing, can be used to verify the cleaning effectiveness.
It is crucial to adhere to the relevant safety standards and operational guidelines when cleaning low-temperature liquid storage tanks. Liquid storage tanks typically have 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 their treatment and disposal.

The safety distance between liquid oxygen storage tanks and buildings is typically governed by relevant safety standards and regulations to ensure the safe separation and fire protection intervals between the tank and the building. The following is a general reference for the safety distance between liquid oxygen storage tanks and buildings:
Horizontal Clearance: The horizontal clearance between the liquid oxygen tank and the structure is typically required to maintain a certain distance to prevent any danger to the structure in case of tank 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 structure, with a general recommendation to maintain a safe distance.
Vertical clearance: The vertical distance between the liquid oxygen storage tank and the building must also comply with relevant safety requirements. This is to prevent the tank from causing danger to the building 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 building, with a general recommendation to maintain a certain safety distance.
Fire Retardant 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 fire retardant separation must be maintained between liquid oxygen storage tanks and buildings to ensure that the fire does not spread or pose a danger to the structures. Specific fire retardant separation requirements:

Carbon dioxide tanks and liquid oxygen tanks are containers used for storing different gases; they have some differences in their physical properties:
Physical State: Carbon dioxide is a gas at room temperature and pressure, and it must be cooled and compressed to become a liquid. Liquid oxygen is a liquid at room temperature, and it must be cooled further to solidify.
Boiling and Freezing Points: The boiling point of carbon dioxide is -78.5 degrees Celsius, with a freezing point at -56.6 degrees Celsius. The boiling point of liquid oxygen is -183 degrees Celsius, and its freezing point is -218.8 degrees Celsius. The boiling and freezing points of liquid oxygen are significantly lower than those of carbon dioxide.
Density: The density of liquid oxygen is high, approximately 1.14 grams per cubic centimeter. The density of carbon dioxide is lower, around 0.00198 grams per cubic centimeter. The density of liquid oxygen is about 570 times that of carbon dioxide.
Pressure: The pressure of liquid oxygen is relatively high, typically ranging from several tens to several hundreds of MPa. The pressure of carbon dioxide is lower, usually within a few MPa range.
Safety: Liquid oxygen has a high oxygen content, which is prone to cause fires and explosions. Carbon dioxide also poses asphyxiation risks at certain concentrations.
Note that both carbon dioxide and liquid oxygen are highly flammable and explosive substances. Strict adherence to relevant safety operation procedures and standards, as well as necessary safety measures, is required during storage and use to ensure the tank's safety and stability.
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, etc. 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 we have developed, such as temperature and pressure vessel welding, biomass boiler emission reduction, and waste heat utilization, have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have accumulated 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 developed deep cryogenic container processing technology using the international plasma arc + filler wire tungsten inert gas (PAW-GTAW) welding technology. This technology has been appraised as internationally competitive at the provincial level in the field of deep cryogenic container manufacturing. Choose Zhongjie Special Equipment, and let's create brilliance together!