Find out the reasons for corrosion on the inner walls of urban water supply pipes

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1. Overview: The main function of urban water supply pipelines is to transport surface water through pipes to treatment plants, where it is processed for use as industrial and domestic water. For various reasons, the inner walls of some pipes were not protected against corrosion. Upon inspection after several years of use, it was found that a significant portion of those inner walls was covered with iron tumors; these tumors were 10–20 millimeters in height, and the degree of corrosion reached 1–3 millimeters, resulting in severe damage to the pipe’s inner walls. Furthermore, corrosion and scaling on the inner wall of the pipes increase the resistance of the pipes, reducing their water transport capacity. According to relevant data, after 10 years of use, the resistance coefficient of the pipeline increases to 1.32 times that at the start of use, and to 1.69 times after 20 years. It can be seen that, in the absence of effective measures on the inner wall of the pipeline, corrosion of that inner wall worsens over time, reducing the pipeline’s service life. At the same time, the pipeline’s water delivery capacity declines as it ages, leading to increased energy consumption. The economic losses from these two are quite substantial. So. Anti-corrosion treatment of the inner wall of pipelines is essential.