Ductile iron pipes are mainly used for water supply, gas transmission and oil transmission in municipal, industrial and mining enterprises. It is the first choice for water supply pipes with high cost performance. Compared with pe pipe, the installation time of ductile iron pipe is simpler and faster than PE pipe, and the internal and external pressure is better after installation; From the point of view of air tightness and corrosion resistance, the installed ductile iron pipe has good air tightness, and the corrosion resistance can also be improved by various anti-corrosion measures. From the hydraulic performance point of view, because the specification of ductile iron pipe generally refers to the inner diameter, the specification of pe pipe generally refers to the outer diameter, because under the same specification, ductile iron pipe can achieve greater runoff; From the comprehensive cost of installation and maintenance, ductile iron pipes have better cost performance. The manufacturers of ductile iron pipes think that the following quality problems should be paid attention to.

The asphalt in the socket and the end of the socket can be baked by gas welding and blowtorch, and the flying thorn and casting sand can be ground off by grinding wheel or chiseled away by chisel. The circumferential clearance of socket fit should meet the needs of joint filling. When ductile iron pipe adopts flexible joint, its socket should be smooth inside and outside, and there must be no defects that affect the sealing performance of the joint. The structure and form of temporary blind plate should meet the stress requirements, and reliable support should be made afterwards during pressure test.