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 a mechanical and electrical equipment installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the council unit 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.
The reason for occasional venting of liquid oxygen tanks is primarily to maintain the safe pressure range within the tank and prevent excessive pressure buildup. The following are several scenarios where liquid oxygen tanks may occasionally vent:
Pressure Control: During the operation of the liquid oxygen tank, pressure inside the tank varies due to evaporation of liquid oxygen and temperature changes. To maintain a safe pressure range within the tank, regular venting is required to control the tank's pressure within the safe limits.
Prevent Excessive Pressure Build-up: During the oxygen filling or usage process, external factors or operational errors may cause the pressure inside the liquid oxygen tank to exceed the safe limit. To prevent excessive pressure accumulation, timely venting is required to alleviate the pressure within the tank.
Prevent Gas Accumulation: Liquid oxygen tanks may contain some gas impurities, such as air and water vapor. These gases can condense into liquids or solids at the low temperatures of liquid oxygen, blocking pipes or affecting the normal operation of the tank. Regularly releasing gas can expel these impurities, keeping the tank clean and unobstructed.
Note that the degassing operation of liquid oxygen should be performed by trained personnel and strictly adhere to the relevant operational procedures and safety measures. During the degassing process, precautions should be taken to prevent leaks of liquid oxygen and contact with it, ensuring the safety and reliability of the operation.

Maintenance and protection of liquid argon tank accessories are crucial for ensuring the normal operation and extending the service life of the tank. The following are general methods for maintaining and protecting liquid argon tank accessories:
Valve Maintenance: Regularly inspect and maintain valves within the storage tank accessories, including inlet valves, exhaust valves, and safety valves. Ensure valves operate smoothly and reliably with no leaks or sticking. Regularly lubricate valves and clean away any debris and dirt.
Pressure Relief Device Maintenance: The pressure relief devices (such as safety valves) in the liquid argon storage tank accessories are critical components ensuring the internal pressure safety of the tank. Regularly inspect and test the operational status of the pressure relief devices to ensure they are functioning properly. Clean and repair as needed.
Sensor and Instrument Maintenance: Sensors and instruments in the liquid argon storage tank accessories are used to monitor and control parameters such as the tank's temperature and pressure. Regularly calibrate and inspect the accuracy and reliability of the sensors and instruments. Keep the sensors and instruments clean and in proper working order.
Insulation Protection: The insulation layer of liquid argon storage tank accessories is crucial for maintaining the low temperature state of liquid argon. Regularly inspect the integrity and insulating performance of the insulation layer, repair or replace damaged insulation materials. Avoid mechanical damage or contamination to the insulation layer.
Cleanliness and Corrosion Protection: Regularly clean the accessories of the tank, removing any impurities and dirt from the surface. Periodically inspect and maintain the corrosion protection layer of the accessories to prevent corrosion and oxidation.
Regular Inspections and Maintenance: Conduct comprehensive inspections and maintenance of liquid argon cylinder accessories on a regular basis, including appearance, fittings, and seals. Promptly identify and address any damage, leaks, or other issues with the accessories.
Record and Document Management: Document each maintenance and service result, including the maintenance date, services performed, issues found, and measures taken. Establish comprehensive management records and documents for tracking and managing the operation of the attachments.
Note that maintenance and protection of liquid argon cylinder accessories should be performed by trained personnel, following relevant specifications and standards. Ensure safety during maintenance and operation, and consult with experts for accurate guidance.

Material control for low-temperature liquid storage tanks is a crucial aspect in ensuring the safety and reliability of the tanks. The following are some common material control measures:
Material Selection: Choose materials suitable for low-temperature environments, such as low-temperature alloy steel, stainless steel, etc. These materials possess excellent low-temperature resistance and crack resistance, maintaining strength and toughness under low-temperature conditions.
Material Quality Control: Ensure the selected materials meet relevant standards and specifications. Conduct chemical composition analysis, mechanical property tests, and impact tests on the materials to ensure their performance meets design requirements.
Welding Material Selection: Choose welding materials suitable for low-temperature environments, such as low-temperature welding rods or welding wires. The welding materials should match the storage tank material, featuring good welding properties and crack resistance.
Welding Process Control: Monitor welding process parameters such as current, voltage, and welding speed to ensure the quality and reliability of the weld joints. Methods with low heat input, such as pulsed welding and laser welding, can minimize the temperature gradient and residual stress in the heat-affected zone.
Corrosion Prevention Measures: Apply corrosion-resistant treatments to the internal and external metal surfaces of the storage tank to extend its service life. Options include corrosion-resistant coatings and paints to protect the metal structure from corrosion.
Material Performance Monitoring: Regularly conduct performance monitoring of the storage tank materials, such as mechanical property tests,

The testing and maintenance procedures for liquid oxygen storage tanks encompass the following aspects:
Appearance Inspection: Conduct regular visual inspections of liquid oxygen tanks, checking for signs of corrosion, wear, leakage, and other issues on the tank surface to ensure the tank's appearance remains intact.
Pressure Testing: Regularly conduct pressure tests on liquid oxygen tanks to assess their pressure resistance. The tests should be carried out 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 the liquid oxygen storage tank to prevent corrosion and oxidation. Use appropriate cleaning agents during cleaning and avoid substances that react with liquid oxygen. Corrosion-resistant coatings or protective coatings can be applied for coating protection.
Regular Maintenance: Regularly maintain liquid oxygen tanks by inspecting and replacing seals, valves, safety devices, etc., to ensure proper operation and safety.
Safety Training and Operating Procedures: Conduct safety training for personnel using liquid oxygen storage tanks to ensure they are aware of the safe operating procedures and precautions, in order to prevent 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.
It is essential that the testing and maintenance of liquid oxygen tanks be conducted by trained personnel, adhering to relevant safety operating procedures and standards. Additionally, a specific testing and maintenance plan should be formulated based on the tank's conditions and usage requirements, and executed as scheduled.
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