Shandong Zhongjie Special Equipment's main products include: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG tanks, oxygen/nitrogen/argon tanks, and CO2 tanks; pressure vessel products such as denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment; central air conditioning and HVAC equipment such as ground (water) source heat pumps, air source units, water-cooled screw units, and air-cooled modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
During the welding process of low-temperature liquid storage tanks, controlling the occurrence of welding cracks is crucial. The following are some methods and measures for controlling welding cracks:
Appropriate Welding Techniques: Select the appropriate welding process and parameters to minimize welding heat input and thermal stress. Methods such as pulsed welding and laser welding, which have low heat input, can reduce the temperature gradient and residual stress in the welding heat-affected zone.
Preheating and post-heat treatment: Perform appropriate preheating before welding to enhance material toughness and reduce thermal stress. Conduct suitable post-heat treatment, such as annealing or stress-relief heat treatment, after welding to minimize residual stress and improve weld toughness.
Select the appropriate welding material: Choose welding materials with good toughness and crack resistance to minimize the occurrence of welding cracks. Select the appropriate welding material based on the storage tank's operating conditions and requirements, such as low-alloy steel, stainless steel, etc.
Control Welding Process: Monitor and regulate parameters and operations during the welding process to minimize the risk of welding cracks. Pay attention to factors such as welding speed, current, voltage, and welding sequence to avoid overheating or rapid welding, thereby reducing the accumulation of thermal and residual stresses.
Non-destructive Inspection and Evaluation: After welding, conduct non-destructive tests on the welds, such as ultrasonic testing and X-ray testing, to assess welding quality and the presence of cracks. Promptly identify and repair welding cracks to ensure the integrity and safety of the weld joints.
It's important to note that controlling welding cracks is a complex process that requires considering various factors, such as materials, welding techniques, and operations. When welding low-temperature liquid storage tanks, it's recommended to consult with a welding engineer or a relevant institution for guidance to ensure both the quality of the welding and the safety of the tank.

To extend the service life of liquid argon storage tanks, the following measures can be taken:
Regular inspections and maintenance: Conduct regular visual inspections of the liquid argon tank, checks on valves and connections, as well as leak detection and pressure testing. Promptly identify and repair potential issues to ensure the tank operates normally.
Maintain the insulation layer: The insulation is crucial for the thermal preservation of liquid argon tanks. Regularly inspect the integrity and insulating properties of the insulation, repair or replace any damaged insulation materials to ensure the tank's insulating effectiveness.
Control Liquid Argon Temperature: The temperature of liquid argon should be maintained within an appropriate range to prevent damage to the storage tank from excessive or insufficient temperatures. Implement suitable cooling or heating measures to ensure the stable temperature of liquid argon.
Corrosion Protection: The outer shell and internal structure of the liquid argon tank should be protected against corrosion and oxidation. Regularly inspect and maintain the protective coating to ensure its integrity.
Avoid excessive pressure and overfilling: Prevent the internal pressure of the tank from being too high or too low, as well as overfilling with liquid argon. Excessive pressure and overfilling can lead to structural破裂 or damage to the tank.
Regular cleaning and draining: Regularly clean the interior of the tank to remove accumulated impurities and dirt. Regularly drain to prevent contaminants and sediments in the liquid argon from damaging the tank.
Safety Operations and Training: Ensure operators are equipped with knowledge and skills for safe handling of liquid argon tanks. Enhance safety training to boost operators' safety awareness and emergency response capabilities.
Establish comprehensive management records and documents, including tank usage, inspection, and maintenance records. Regularly review and update these records to ensure safe management and maintenance of the tanks.
These measures can help extend the service life of liquid argon storage tanks, but specific operations and management are required based on the type and application of the tank. When performing maintenance and operation, please adhere to relevant regulations and standards, and consult with experts to ensure safety and effectiveness.

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 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 may be required as needed to ensure all contaminants are removed.
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 residual contaminants are left 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 are typically highly flammable and exhibit 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.

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 for monitoring 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 storage tank.
Pressure Relief Device: Used to discharge gas into a safe area when the pressure inside the storage tank is too high, thereby reducing the pressure of the tank. The pressure relief device usually includes pressure relief valves, relief pipes, etc.
Level sensor: Used to monitor the level change of liquid oxygen in storage tanks to ensure sufficient liquid oxygen inside 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 fires to other areas.
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 innovative and excellent 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 from Shandong University, has developed deep cryogenic vessel processing technology using the international plasma arc + filler wire tungsten inert gas arc welding (PAW-GTAW) technology, which has been appraised as reaching international standards in the field of deep cryogenic vessel manufacturing at the provincial level. Choose Zhongjie Special Equipment, and let's create brilliance together!