municipal pipe network is the "blood vessel" of the city, but for a long time, the problem that traditional metal or concrete pipes are vulnerable to soil corrosion and acid and alkali medium erosion has been a "long-standing problem" in pipe network transformation. Frequent leakage and repeated maintenance not only raise the cost of operation and maintenance, but also affect the lives of citizens. In this context, the AD PE coil has become the preferred solution for many recent municipal pipe network transformation projects due to its excellent corrosion resistance, and has been widely recognized by the engineering side. The AD PE coil is made of high-density polyethylene (HDPE) raw material, which has excellent chemical stability and can resist acid and alkali ions in the soil, microbial erosion, and corrosive media in urban sewage. Compared with traditional pipes, it will not rust like metal pipes, nor will it crack due to carbonization and weathering like concrete pipes, which solves the problem of shortening the pipeline life caused by corrosion from the root cause. Take the old community pipe network renovation project in a southern city as an example. The cast iron pipe used in the project had to deal with leakage problems 3-5 times a year due to soil acidification and corrosion. After switching to AD PE coil pipe, after 18 months of operation, the inner wall of the pipe is still smooth as before, without any traces of corrosion. The person in charge of the engineering side in charge of the project construction said: "Before, the biggest worry was that the pipeline would leak after three or five years. Now the corrosion resistance of AD PE coils saves us a lot of worry - not only does it not need to do additional anti-corrosion treatment during installation, but the later operation and maintenance pressure is also greatly reduced." In addition to corrosion resistance, the flexibility and connection reliability of AD PE coils also provide convenience for the engineering side. Its coil structure is easy to lay flexibly on site, especially suitable for pipe network transformation in complex terrain; it is connected by hot melt or electric fusion, and the interface strength is higher than the pipe itself, avoiding the hidden danger of corrosion and leakage due to connection parts. A senior engineer of a municipal engineering design institute commented: "In the long-term buried scene of the municipal pipe network, corrosion resistance is the core requirement, and the AD PE coil just captures this point, and the comprehensive performance is balanced, which is indeed the ideal choice for the renovation project." From "passive maintenance" to "active anti-corrosion", the AD PE coil provides a longer-term and more economical solution for the renovation of the municipal pipe network through the advantages of material technology. At present, municipal projects in many cities have included it in the priority procurement list, and its corrosion resistance is being used in practice to become synonymous with "reliable pipe network" in the hearts of the engineering side.