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, B-grade boiler installation and GB2, GC2 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.
Liquid Oxygen Stations are facilities used for storing and supplying liquid oxygen, with liquid oxygen tanks being a crucial component of these stations. The liquid oxygen tanks offer several important functions and features:
Store Liquid Oxygen: Liquid oxygen tanks are primarily used for storing liquid oxygen, cooling gaseous oxygen below its critical temperature to convert it into a liquid state. The storage density of liquid oxygen is high, allowing for a large amount of oxygen to be stored in a relatively small space.
Maintain Low Temperatures: Liquid oxygen tanks are typically double-walled, with a vacuum layer between the inner and outer walls to minimize heat transfer and maintain低温. This helps to keep the liquid oxygen at a低温 state, preventing premature vaporization.
Safety Design: Liquid oxygen tanks must be designed and manufactured with safety in mind. They are typically made from high-strength materials such as stainless steel or aluminum alloy to withstand high pressure and low-temperature requirements. Additionally, liquid oxygen tanks are equipped with safety valves, pressure sensors, and temperature sensors to ensure that the pressure and temperature inside the tank remain within safe limits.
Supply System Connection: Liquid oxygen tanks are typically connected to the supply system to transport liquid oxygen to the required locations. The supply system includes liquid oxygen pumps, pipes, and valves, etc., which are used to extract liquid oxygen from the tank and deliver it to the user end.
Liquid oxygen tanks play a crucial role in storing and maintaining liquid oxygen in liquid oxygen stations. Their design and operation must strictly adhere to relevant safety standards and procedures to ensure the safety and reliability of the storage and supply process.

Low-temperature liquid oxygen storage tanks typically require certain safety accessories to ensure safe operation and to address potential risks. The following are some common safety accessories for low-temperature liquid oxygen storage tanks:
Pressure Sensor: Used to monitor pressure changes within storage tanks. Should the pressure exceed the set range, it will trigger an alarm or automatically stop filling measures to prevent overpressure in the tank.
Safety Valve: Used to automatically release gas when the pressure inside the storage tank exceeds the set value, preventing overpressure. The safety valve should be selected and installed based on the design pressure and capacity of the tank.
Pressure Relief Device: Used to discharge gas into a safe area when the pressure inside the storage tank is too high, in order to alleviate the pressure on the tank. The pressure relief device typically includes pressure relief valves, relief piping, etc.
Level sensor: Used to monitor the liquid oxygen level changes within the storage tank to ensure adequate oxygen levels and prevent overfilling.
Temperature Sensor: Used to monitor temperature changes within storage tanks to ensure that the temperature of liquid oxygen inside remains within a safe range.
Fire Detectors and Fire Suppression Systems: Designed to monitor fire risks around storage tanks and activate fire suppression systems as needed to prevent the spread of fire to adjacent areas.

The testing and maintenance operations for liquid oxygen storage tanks encompass the following aspects:
Visual Inspection: Regularly inspect the liquid oxygen storage tank for any signs of corrosion, wear, or leakage on the tank surface to ensure the integrity of its appearance.
Pressure Testing: Regularly conduct pressure tests on liquid oxygen tanks to assess their pressure resistance. The tests should be conducted in accordance with relevant standards and regulations to ensure the tanks 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 their sealing performance is good and there are no leak issues.
Cleaning and Coating Protection: Regularly clean and coat liquid oxygen tanks to prevent corrosion and oxidation. Use appropriate cleaning agents during cleaning and avoid substances that react with liquid oxygen. Anti-corrosion coatings or protective coatings can be applied for coating protection.
Regular Maintenance: Perform regular maintenance on liquid oxygen tanks, including inspections and replacements of seals, valves, safety devices, etc., to ensure proper operation and safety.
Safety Training and Operating Procedures: Conduct safety training for personnel using liquid oxygen tanks to ensure they are familiar with the safe operating procedures and precautions, to prevent operational errors and accidents.
Record and Document Management: Establish test and maintenance records for liquid oxygen storage tanks, including test results, maintenance records, and repair records, for traceability and management purposes.
It is essential that testing and maintenance of liquid oxygen tanks be conducted by trained personnel, following relevant safety operation procedures and standards. Additionally, a specific testing and maintenance plan should be developed based on the tank's conditions and usage requirements, and executed according to the plan.

One of the common drawbacks of pressure vessels during use is corrosion. Corrosion refers to the reaction between the metal surface and chemical substances in the environment, leading to damage to the metal surface and thinning of the material. The following are common corrosion drawbacks of pressure vessels:
Pitting Corrosion: Pitting corrosion refers to localized pits or holes that appear on the surface of metal. This type of corrosion is usually caused by corrosive substances present in the local environment, such as acids, salts, etc.
Bacterial Corrosion: Bacterial corrosion is a type of corrosion caused by microorganisms. These organisms can form biofilms inside pressure vessels and produce acidic substances, leading to corrosion of the metal surface.
Porous Corrosion: Porous corrosion refers to the penetrating corrosion that occurs on the surface of metal. This type of corrosion usually happens due to the damage or defect of the protective layer on the metal surface, allowing corrosive substances to come into direct contact with the metal.
Stress Corrosion Cracking: Stress corrosion cracking is the formation and propagation of cracks in a metal surface due to the combined action of stress and a corrosive environment. This type of corrosion often occurs in pressure vessels under high stress and corrosive conditions.
Corrosion can lead to material thinning and reduced strength in pressure vessels, potentially causing severe consequences such as leaks or ruptures. Therefore, to address corrosion issues in pressure vessels, the following measures should be taken:
Regularly inspect and evaluate the corrosion of pressure vessels, including methods such as visual inspections and non-destructive testing.
Take anti-corrosion measures such as coating protection, cathodic protection, and appropriate material selection to minimize corrosion occurrence and progression.
Regularly clean and maintain pressure vessels to remove dirt and impurities that may cause corrosion.
Comply with relevant safety regulations and operational guidelines to ensure the safe and proper operation of pressure vessels.
For severely corroded pressure vessels, repairs or replacements may be necessary to ensure their safety and reliability.
Our company attaches great importance to technological innovation and R&D design, boasting one municipal-level enterprise technology center in Heze City. We have established testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc. Equipped with over 600 units of 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, our key products such as welding for temperature and pressure vessels, biomass boiler emission reduction, and waste heat utilization have successively been shortlisted 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 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 developed deep cryogenic container processing technology using the international plasma arc + filler wire tungsten inert gas arc welding (PAW-GTAW) technology, which has been appraised as internationally competitive at the provincial level for scientific and technological achievements. Choose Zhongjie Special Equipment, and let's create brilliance together!