Design flaws related to corrosion protection led to pipeline corrosion and loss of functionality after about 7 years of use for buried pipelines
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This post was last edited by Wang Wei2 on 2024-8-2 at 12:06. The underground sewage pipes in a residential complex in the north have been out of use for over 7 years; they are no longer worth repairing and must be replaced. The pipe in the image is DN300; it is made of carbon steel and has corroded and broken apart, becoming completely unusable. The remaining pipelines on site show that the original anti-corrosion measures did not meet the requirements, which led to the pipelines corroding and failing in a short period of time. It has severely affected the lives of residents. Subsequent pipe replacements cause severe damage to ground facilities and incur high investment costs. Therefore, when selecting materials for buried pipelines, the anti-corrosion properties must meet the required standards.
When selecting and designing buried pipelines, it is essential to ensure that the chosen materials and anti-corrosion measures can cope with corrosion in the soil environment. An inadequate anti-corrosion design can lead to severe corrosion in the pipes after several years of use, resulting in service failures, inconvenience for residents, and high replacement costs. Therefore, a reasonable anti-corrosion strategy and proper material selection are crucial for ensuring the long-term stable operation of pipelines. .
Replacement can boost GDP.
Suggestions on material selection and corrosion protection for buried pipes: 1. Material selection suggestions: For buried sewage pipes, it is recommended to use materials that are resistant to corrosion, wear, and have high compressive strength, such as plastic pipes like polyethylene (PE) and polypropylene (PP), or metal pipes such as cast iron and ductile iron. These materials possess good durability and corrosion resistance. Considering that the pipeline needs to withstand certain pressures and ground loads, attention must also be paid to the mechanical properties and ring stiffness of the material when selecting it. 2. Anti-corrosion treatment: Effective anti-corrosion treatment is necessary for metal pipes. Common anti-corrosion methods include applying anti-corrosion coatings, lining protection, cathodic protection, etc. Anticorrosive coatings should be selected for their good weather resistance, strong adhesion, and resistance to chemical corrosion, and should be applied in accordance with relevant standards to ensure a uniform coating with no gaps. For lining protection, appropriate lining materials such as rubber or plastic can be used to protect the inner wall of the pipes, preventing corrosion caused by wastewater. Cathodic protection is an effective electrochemical protection method that prevents pipelines from failing due to electrochemical corrosion. 3. Construction and maintenance: During the construction process, operations must be carried out strictly in accordance with standards to ensure the quality of pipeline installation. At the same time, regular inspections and maintenance of the pipelines are carried out to identify and address potential issues promptly. For pipelines that are already in use, a regular inspection and maintenance system should be established, including periodic checks for corrosion and the cleaning of debris inside the pipelines.