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 and 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 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 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 for controlling 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 lower the temperature gradient and residual stress in the焊接 heat-affected zone.
Preheating and post-heat treatment: Perform appropriate preheating before welding to enhance material toughness and reduce thermal stress. Conduct a suitable post-heat treatment, such as annealing or stress-relief heat treatment, after welding to minimize residual stress and improve the toughness of the weld.
Select the appropriate welding material: Choose welding materials with good toughness and crack resistance to minimize the occurrence of welding cracks. Select the suitable welding material based on the storage tank's usage 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, 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 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.

Routine inspections and maintenance of liquid oxygen storage tanks are crucial for ensuring their safe operation. The following are general steps for the daily inspection and maintenance of liquid oxygen storage tanks:
Appearance Inspection: Regularly inspect the tank's appearance, including the shell, welds, valves, and fittings. Pay attention to any abnormal conditions such as 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 probes.
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 check for any signs of looseness or damage. Ensure the valves operate 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 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 liquid oxygen.
Safety Equipment Inspection: Examine 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: Document the outcomes of each inspection and maintenance, including inspection dates, contents, identified issues, and corrective measures. Establish comprehensive management records and documentation to facilitate tracking and management of 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 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 regular visual inspections of the liquid argon storage tank, check valves and connections, and perform leak detection and pressure tests. Identify and repair potential issues promptly to ensure the normal operation of the tank.
Maintain Insulation: The insulation is crucial for the thermal retention of liquid argon tanks. Regularly inspect the integrity and insulating properties of the insulation, repair or replace 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 low 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 it remains intact.
Avoid excessive pressure and over-filling: Prevent excessive internal pressure or under-pressure in the tank, as well as over-filling with liquid argon. Excessive pressure and over-filling may lead to structural cracking or damage of the tank.
Regular cleaning and draining: Periodically 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 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 the usage of tanks, inspection records, maintenance logs, etc. Regularly review and update management 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, follow relevant regulations and standards, and consult experts to ensure safety and effectiveness.

Daily inspection contents for liquid nitrogen tanks mainly include the following aspects:
Visual Inspection: Check for any obvious damage, deformation, or corrosion on the tank's exterior, including the tank wall, valves, pipes, and joints.
Sealability Inspection: Verify the sealing performance of the tank, including checking for leaks at valve and pipeline connections, and ensuring the tank's exhaust and safety valves 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 correctly.
Level Check: Monitor the liquid nitrogen tank's level to ensure it remains within the normal range, avoiding issues caused by levels that are too high or too low.
Insulation Layer Inspection: Verify the integrity of the storage tank's insulation layer, checking for any damage or detachment to ensure effective insulation and reduce evaporation losses of liquid nitrogen.
Leak Inspection: Check for signs of liquid nitrogen leakage around the storage tank, including frost, ice, or liquid nitrogen residue on the ground.
Safety Equipment Inspection: Verify that the storage tank's safety equipment, such as leak detectors, alarm systems, and safety valves, are functioning properly to ensure the tank's safety.
Clean Inspection: Regularly clean the interior of tanks to remove accumulated impurities and dirt, maintaining cleanliness and hygiene.
Above are the key contents for the daily inspection of liquid nitrogen tanks. The specific inspection items need to be adjusted and supplemented according to the tank's model, usage, and relevant regulations. During the inspection process, strict adherence to the operational procedures and safety operation requirements is essential to ensure the safe operation of the tank.
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