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/Class, GC2/Class pressure pipeline installation licenses, as well as an electromechanical equipment installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the council member of the Shandong Equipment Manufacturing Association. The company has also passed the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System certifications, and the American ASME/U2 certification.
Carbon dioxide tanks and liquid oxygen tanks are containers used for storing different gases, and they have some physical properties that differ:
Physical State: Carbon dioxide is a gas at room temperature and pressure, and it needs to be cooled and pressurized 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°C, and its freezing point is -56.6°C. The boiling point of liquid oxygen is -183°C, and its freezing point is -218.8°C. The boiling and freezing points of liquid oxygen are significantly lower than those of carbon dioxide.
Density: Liquid oxygen has a higher density, approximately 1.14 grams per cubic centimeter. Carbon dioxide has a lower density, around 0.00198 grams per cubic centimeter. The density of liquid oxygen is about 570 times that of carbon dioxide.
Pressure: Liquid oxygen has a higher pressure, typically ranging from tens to hundreds of MPa. Carbon dioxide has a lower pressure, usually within a few MPa range.
Safety: Liquid oxygen contains a high concentration of oxygen, which is easily ignitable and explosive. Carbon dioxide is also hazardous due to asphyxiation at certain concentrations.
Note that carbon dioxide and liquid oxygen are both flammable and explosive substances. Strict adherence to relevant safety operation procedures and standards, as well as necessary safety measures, must be taken to ensure the safety and stability of storage tanks.

The leak treatment methods for liquid argon storage tanks primarily include the following steps:
Identified Air Leaks: Detected through odors, gas detection equipment, or abnormal pressure in liquid argon storage tanks, air leaks in the liquid argon storage tanks are identified.
Confirm Air Leaks: Use gas detection instruments or foam leak detectors, etc., to locate the specific air leaks. Inspect tank interfaces, valves, pipe connections, and other areas to find the leak points.
Cease air leakage sources: Take appropriate measures to stop air leakage sources based on the leakage location. For example, for air leakage at interfaces, inspect and adjust sealing washers or tighten bolts; for valve air leakage, inspect and replace seals.
Isolate Air Leaks: During the process of dealing with air leaks, it is necessary to isolate the leaky areas to ensure personnel safety. Set up warning signs, restrict access to the area, and take necessary protective measures, such as wearing protective masks and gloves.
Evacuating Liquid Argon: If air leakage cannot be repaired immediately or the leakage is significant, consider evacuating the liquid argon. By gradually reducing the pressure of liquid argon in the storage tank, convert it into a gas to minimize the risk of air leakage.
Ventilation Treatment: During the air leakage treatment, ensure good ventilation and promptly exhaust the gases produced by the evaporation of liquid argon. Natural ventilation or the use of ventilation equipment can be employed to expel the evaporated gases of liquid argon outdoors.
Safety Assessment and Repair: After the air leakage treatment is completed, conduct a safety assessment to ensure the tank's safety. Based on the assessment results, perform necessary repairs and maintenance to prevent air leakage from recurring.
Note that liquid argon is a low-temperature liquid with a low boiling and freezing point. Caution is required when handling leaks to avoid contact, which can cause chills. When dealing with a leak in a liquid argon storage tank, it should be handled by personnel and followed the relevant safety operating procedures and standards.

The safety distance for liquid oxygen storage tanks refers to the distance that must be maintained around the tank to ensure the safety of personnel and equipment. The specific requirements for safety distances may vary depending on different regions and application sites. Below are some common principles for safety distances: Buildings and Equipment: Liquid oxygen storage tanks should be kept at a certain distance from buildings, equipment, and other storage tanks to prevent the spread of fires, explosions, and leaks. The specific safety distance requirements should be assessed and determined according to local regulations and standards. Fire and Heat Sources: Liquid oxygen is highly oxidizing and can easily cause fires and explosions. Therefore, liquid oxygen storage tanks should be kept at a sufficient distance from fire and heat sources and flammable materials to prevent fires and explosions. Ventilation and Exhaust: Good ventilation and exhaust should be maintained around liquid oxygen storage tanks to prevent the accumulation of vapor and the formation of explosive mixtures. The design and operation of the ventilation and exhaust system should comply with relevant safety standards and specifications. Personnel and Traffic: Personnel and traffic around the liquid oxygen storage tank should be restricted and controlled to ensure personnel safety and the normal operation of the tank. Warning signs, safety fences, and restricted areas should be established to prevent unauthorized personnel from entering the tank area. It should be noted that the safety distance for liquid oxygen storage tanks should be assessed and determined based on the specific application site and safety requirements. When designing, installing, and operating liquid oxygen storage tanks, relevant regulations, standards, and safety guidelines should be followed to ensure the safety and reliability of the tank.

In pressure vessel design, several common "thickness" parameters must be considered:
Wall Thickness: The wall thickness refers to the actual thickness of the pressure vessel wall. The selection of wall thickness should consider factors such as the design pressure of the vessel, the strength and corrosion resistance of the material, to ensure the strength and safety of the vessel.
Bend Allowance: The bend allowance refers to the additional thickness added to the wall thickness during the manufacturing process to ensure the strength and shape of the container's bending section. The calculation and selection of the bend allowance must consider factors such as the container's bending radius and the material's bendability.
Corrosion Allowance: The corrosion allowance refers to the additional thickness added to the wall to account for internal or external corrosion effects on the container. The selection of the corrosion allowance should consider the working environment of the container and the corrosive nature of the medium to ensure the container can withstand the effects of corrosion throughout its service life.
These "thickness" parameters play a crucial role in pressure vessel design, affecting the container's strength, corrosion resistance, and safety. During the design process, it is necessary to select and calculate these thickness parameters rationally, based on relevant standards and specifications, in conjunction with the container's usage conditions and requirements, to ensure that the design and manufacturing meet the necessary standards.
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