(1) Good air tightness, reduce water loss, reduce production and marketing gap rate, and avoid the infiltration of external sewage during pipe network maintenance.

(2) Good chemical stability, corrosion resistance of the inner wall of the pipeline, will not be eroded by various substances in the water, and will not precipitate toxic and harmful substances into the water.

(3) Good hydraulic conditions, smooth inner wall, not easy to scale, reduce head loss, and reduce perennial water supply and power consumption.

(4) It is convenient for construction and maintenance to shorten the water outage time caused by maintenance as much as possible.

(5) The construction investment is small, and the construction cost of the pipe network accounts for 50% to 70% of the total cost, and the price of the pipe accounts for more than 50% of the comprehensive pipeline project. Therefore, it is necessary to choose pipes that can ensure quality and are relatively cheap.

(6) The long service life and the expansion of the pipe network have a great impact on urban transportation and the environment, and they are generally designed according to permanent engineering facilities.