Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, A2-grade pressure vessel manufacturing license, A2-grade pressure vessel design license, B-grade boiler installation, and GB2/Class, GC2/Class pressure pipeline installation licenses, as well as an equipment and machinery installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and a director unit of the Shandong Equipment Manufacturing Association. The company has also passed certifications for the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System, and the American ASME/U2 certification.
Daily inspections and maintenance of liquid oxygen storage tanks are crucial for ensuring safe operation. The following are general steps for the daily inspections and maintenance of liquid oxygen storage tanks:
Visual Inspection: Regularly inspect the appearance of the storage tank, including the shell, welds, valves, and connecting parts. Pay attention to any signs of cracks, corrosion, or deformation.
Leak Detection: Utilize appropriate leak detection equipment to inspect for leaks in storage tanks and connecting areas. Leak detection can be conducted using methods such as gas detectors or liquid oxygen detection agents.
Pressure Testing: Regularly conduct pressure tests to inspect the tank's sealing and pressure resistance. Perform pressure tests in accordance with relevant standards and regulations, and record the test results.
Valve and Fitting Inspection: Verify that the valves and fittings on the tank are functioning properly and are not loose or damaged. Ensure the valves operate smoothly and reliably.
Insulation Layer Inspection: Check if the insulation layer of the tank is intact, and look for any signs of damage or detachment. Repair or replace any damaged insulation material to ensure effective insulation.
Cleaning and Drainage: Regularly clean the interior of the tank to remove accumulated impurities and dirt. Regularly drain to prevent damage to the tank from impurities and sediments in the liquid oxygen.
Safety Equipment Inspection: Examine the safety equipment around the storage tanks, such as fire separation areas and alarm systems, to ensure they are functioning properly.
Record and Document Management: Document the results of each inspection and maintenance, including the inspection date, contents, issues found, and corrective measures. Establish comprehensive management records and documents for tracking and managing the tank's operational status.
Note that inspections and maintenance of liquid oxygen tanks should be conducted by trained personnel and in accordance with relevant regulations and standards. Ensure safety during maintenance and operations, and consult with experts for accurate guidance.

In 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: Selecting the appropriate welding process and parameters helps 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 heat-affected zone of welding.
Preheating and Post-Weld Heat Treatment: Perform appropriate preheating before welding to enhance material toughness and reduce thermal stress. Conduct a suitable post-weld heat treatment, such as annealing or stress-relieving heat treatment, to minimize residual stress and improve the toughness of the weld.
Select appropriate welding materials: 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 adjust 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, reducing the accumulation of thermal and residual stresses.
Non-destructive Testing and Evaluation: After welding is completed, conduct non-destructive testing of 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 multiple factors, including materials, welding techniques, and operations. When welding low-temperature liquid storage tanks, it's advisable to consult with a welding engineer or relevant institutions for guidance to ensure welding quality and the safety of the tank.

The reasons for not leaving liquid oxygen tanks empty for extended periods are mainly as follows:
Vapor Loss of Liquid Oxygen: Liquid oxygen has a low boiling point, and if left unused for a long time, it will continuously evaporate, resulting in a loss of liquid oxygen within the storage tank. The evaporation rate of liquid oxygen is relatively fast, with daily evaporation amounts potentially reaching up to several percent of the tank's capacity. Long-term disuse can lead to waste of liquid oxygen.
Safety Risk: Liquid oxygen is a strong oxidizing agent with high flammability and explosiveness. Prolonged emptying of liquid oxygen storage tanks increases the opportunities for contact between liquid oxygen and the surrounding environment, thereby enhancing the risk of unexpected fires and explosions.
Tank Damage Risk: Long-term emptying of liquid oxygen tanks can lead to internal oxidation reactions, accelerating corrosion and damage to the tank. Tank damage affects its sealing performance and structural integrity, increasing the risk of leaks and safety accidents.
Therefore, to ensure the safe storage and effective utilization of liquid oxygen, liquid oxygen tanks should be regularly maintained and serviced to prevent long-term empty storage. When the tank is not in use, appropriate measures should be taken, such as sealing the tank and reducing oxygen evaporation, to minimize the loss of liquid oxygen and safety risks.

A liquid oxygen station is a facility used for storing and supplying liquid oxygen, and the liquid oxygen tank is an essential component of the liquid oxygen station. The liquid oxygen tank has 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 the storage of large amounts of oxygen in a relatively small space.
Maintain Low Temperature: Liquid oxygen tanks are typically designed with a double-layer structure, separated by a vacuum layer between the inner and outer layers to reduce heat conduction and maintain low temperatures. This helps 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 conditions. Additionally, liquid oxygen tanks are equipped with safety valves, pressure sensors, and temperature sensors to ensure that the internal pressure and temperature of 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, pipelines, 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 at liquid oxygen stations. Their design and use must strictly adhere to relevant safety regulations and operational procedures to ensure the safety and reliability of the storage and supply process.
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