The air tightness of the nodular graphite pipe is better after installation, and the anti-corrosion performance can also be improved through various anti-corrosion methods; From the hydraulic performance point of view, ductile iron pipe can achieve greater runoff; From the perspective of comprehensive installation and maintenance costs, ductile iron pipes have better cost performance. Inner wall zinc spraying, cement mortar anti-corrosion materials, etc., are mainly used for municipal, industrial and mining enterprises water supply, gas transmission, oil transmission, etc., and are the first choice of cost-effective water supply pipelines.