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Direct causes affecting the quality of double-walled tanks
2020-07-15
Double-walled tanks, as everyone knows, are primarily composed of inner and outer tanks. Widely used in the petrochemical industry, they are typically installed underground, hence the name "buried double-walled tanks." The outer tank seals the inner tank, and a 24-hour monitoring system ensures safe operation. Therefore, the quality of double-walled tanks is crucial, as it directly impacts the safety of the oil depot and personnel. So, what are the factors affecting the quality of double-walled tanks? Let's explore this with Huajing editor.
1. Substandard steel quality: Many manufacturers cut corners by purchasing steel from smaller factories. This steel often has high carbon and sulfur content, leading to hot cracks during welding, reduced weld ductility, weld cracking, and oil leaks.
2. Poor design to reduce project costs: Some manufacturers cut corners to reduce costs by reducing the steel plate thickness in the design, decreasing the strength of the double-walled tank. This can lead to deformation or even collapse of the buried double-walled tank during oil storage.
3. Unreasonable material selection: In many large buried double-walled tank projects (over 10,000 cubic meters), Q235 steel plates are used throughout, resulting in insufficient strength in the lower half of the tank, leading to deformation.
4. High weld stress during installation: Inexperienced installers may apply excessive force during welding, increasing weld stress and leading to cracking and oil leaks during operation.
5. The welding of the buried double-walled tank does not break.
Daily maintenance of buried double-walled tanks:
1. Maintenance should follow the maintenance procedures. Maintenance is divided into annual, quarterly, and monthly maintenance.
2. Tank accessories must be kept in good condition. Regular inspection and maintenance should be conducted, and records should be kept.
3. The tank body should be clean, with no water, oil stains, or debris on the top. The insulation layer should remain intact, and the protective layer should be free of damage.
4. Monthly inspection: The oil level gauge should be inspected before each use and covered after use.
5. The breather valve, pressure relief valve, and flame arrester should be inspected monthly, and weekly in winter. The breather valve should be flexible and easy to use, and the hydraulic valve oil level and quality should meet the requirements.
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