In recent years, the total water supply has been maintained at about 50 billion cubic meters, which was 51.342 billion cubic meters in 2011, of which production water was 15.965 billion cubic meters, accounting for 31.09% of the total water supply; domestic water was 24.765 billion cubic meters, accounting for 24.765 billion cubic meters of water supply. 48.24% of the total. In 2011, the length of my country's urban water supply pipelines reached 570,000 kilometers, 1.5 times that of the end of the "Tenth Five-Year Plan" period. However, the leakage problem of water supply network in many cities and towns is serious, and the leakage rate is as high as 25%-30%. The plastic pipe is corrosion-resistant, the PVC pipe system adopts flexible connection, and the PE pipe system adopts welding, so the anti-leakage effect is very obvious. Therefore, with the development and progress of plastic pipes in the field of outdoor water supply, it is an inevitable trend that more and more plastic pipes are used in urban water supply network. At present, 37% of the main pipes in my country's urban water supply network have serious aging problems, and 32.8% have poor materials. The pipe network of the urban water supply system is old, damaged and seriously corroded. The average loss rate of water supply is 20%, and the waste of resources is large. Therefore, there is a large demand space for leak repair and replacement of urban water supply plastic pipes.
