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 equipment and machinery installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the理事 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 U.S. ASME/U2 certification.
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 to control welding cracks:
Appropriate Welding Techniques: Selecting the appropriate welding process and parameters can reduce welding heat input and thermal stress. Methods with low heat input, such as pulse welding and laser welding, can decrease the temperature gradient and residual stress in the welding heat-affected zone.
Preheating and post-heat treatment: Perform proper preheating before welding to enhance material toughness and reduce thermal stress. Conduct appropriate post-heat treatment, such as annealing or stress-relieving heat treatment, after welding 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 materials based on the storage tank's operating conditions and requirements, such as low-alloy steel, stainless steel, etc.
Control welding process: 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, reducing the accumulation of thermal and residual stresses.
Non-destructive Testing and Evaluation: After welding, conduct non-destructive testing on the welds, such as ultrasonic testing and X-ray testing, to assess welding quality and the presence of cracks. Promptly detect and repair welding cracks to ensure the integrity and safety of the weld joints.
It's important to note that controlling weld cracks is a complex process that requires a comprehensive consideration of factors such as material, welding techniques, and operations. When welding low-temperature liquid storage tanks, it is advisable to consult a welding engineer or relevant institution for guidance to ensure both welding quality and the safety of the tank.

Routine inspections and maintenance of liquid oxygen storage tanks are crucial for ensuring their safe operation. The following are general steps for the daily inspections and maintenance of liquid oxygen storage tanks:
Visual Inspection: Regularly inspect the tank's exterior, including the shell, welds, valves, and fasteners. 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 connection points. Leak detection can be conducted using methods such as gas detectors or liquid oxygen detection agents.
Pressure Testing: Conduct regular pressure tests to inspect the tank's sealing and pressure resistance. Perform pressure tests according to relevant standards and regulations, and record the test results.
Valve and Fitting Inspection: Verify that the tank's valves and fittings are operating properly and check for any loose or damaged conditions. Ensure the valves open and close smoothly and reliably.
Insulation Layer Inspection: Check if the insulation layer of the tank is intact without any damage or detachment. Repair or replace any damaged insulation materials to ensure effective insulation.
Cleaning and Drainage: Regularly clean the interior of the tank to remove accumulated impurities and dirt. Regularly drain to prevent the impurities and sediments in liquid oxygen from damaging the tank.
Safety Equipment Inspection: Check the safety equipment around the storage tank, such as fire separation zones and alarm systems, to ensure they are functioning properly.
Record and Document Management: Record the results of each inspection and maintenance, including the inspection date, contents, issues found, and measures taken. 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 specifications and standards. Ensure safety during maintenance and operation, and consult experts for accurate guidance.

To extend the service life of liquid argon storage tanks, the following measures can be taken:
Regular inspections and maintenance: Conduct periodic visual inspections of the liquid argon storage tank, checks on valves and fittings, and leak detection and pressure tests, etc. Detect and repair potential issues promptly to ensure the normal operation of the tank.
Maintain Insulation Layer: The insulation layer is crucial for the thermal insulation of liquid argon storage tanks. Regularly inspect the integrity and insulation performance of the insulation layer, repair or replace damaged insulation materials to ensure the tank's insulation effectiveness.
Regulate 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. Employ suitable cooling or heating measures to ensure stable liquid argon temperatures.
Corrosion Protection: The exterior shell and internal structure of the liquid argon tank should be provided with corrosion protection to prevent rust and oxidation. Regular inspections and maintenance of the protective coating are required to ensure its integrity and undamaged condition.
Avoid excessive pressure and overfilling: Prevent excessive internal pressure or under-pressure in the tank, as well as overfilling with liquid argon. Excessive pressure and overfilling may lead to structural rupture or damage to the tank.
Regular cleaning and waste removal: Regularly clean the interior of the tank to remove accumulated impurities and dirt. Regularly remove waste to prevent contaminants and sediments in liquid argon from damaging the tank.
Safety Operation and Training: Ensure operators are knowledgeable and skilled in the safe operation 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 should be tailored to the type and application of the tank. When performing maintenance and operation, adhere to relevant regulations and standards, and consult with experts to ensure safety and effectiveness.

The daily inspection content for liquid nitrogen tanks primarily includes the following aspects:
Appearance Inspection: Check for any obvious damage, deformation, or corrosion on the tank's exterior, including the tank walls, valves, pipes, and joints.
Sealability Inspection: Verify the tank's sealing performance, including checking for leaks at valve and pipe connections, and ensuring the tank's exhaust valve and safety valve are functioning properly.
Pressure Check: Verify that the tank's pressure gauge is functioning properly and that the pressure is within the normal range to ensure the tank operates normally.
Level Check: Inspect the liquid nitrogen tank's level to ensure it's within the normal range, avoiding issues caused by excessive or low levels.
Insulation Layer Inspection: Verify the integrity of the storage tank's insulation layer, checking for any damage or signs of detachment to ensure optimal insulation and minimize evaporation losses of liquid nitrogen.
Leak Inspection: Check for signs of liquid nitrogen leakage around the storage tank, including frost, ice, or liquid nitrogen stains on the ground.
Safety Equipment Inspection: Verify that the safety equipment of the storage tank, such as leak detectors, alarm systems, and safety valves, are functioning properly to ensure the tank's safety.
Cleaning Inspection: Regularly clean the interior of storage tanks to remove accumulated impurities and dirt, maintaining cleanliness and hygiene of the tanks.
Above are the essential daily inspections for liquid nitrogen tanks. Specific inspection items should be adjusted and supplemented according to the tank's model, usage, and relevant regulations. During the inspection process, strict adherence to operational procedures and safety standards is required to ensure the safe operation of the tank.
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