Classification of ductile iron pipes

 　　According to the casting method: it is divided into the continuous ductile iron pipe and centrifugal ductile iron pipe. Centrifugal ductile iron pipe is divided into the sand type and metal type.

　　Centrifugal spheroidal graphite cast iron pipes are cast iron pipes. Cast iron pipes are used for water supply, drainage, and gas transmission pipelines. It includes straight cast iron pipes and pipe fittings.

　　According to the material used: it is divided into the gray iron pipe and high silicon iron pipe.

　　The sand centrifugal cast iron straight pipe is made of gray cast iron, which is suitable for the transportation of pressure fluids such as water and gas.

　　High-silicon cast iron has the advantages of good corrosion resistance, low cost, saving precious metals, etc. It is especially suitable for making to withstand static loads and interact with various strong corrosive media (such as nitric acid, sulfuric acid, chromic acid, organic acid, and A series of salt solutions) contact parts.

　　According to the interface form: divided into the flexible interface, interface flange, self-anchored interface, and rigid interface, etc. Among them, the flexible ductile iron rubber ring seal works; the flange interface flange is fixed ductile iron and the cushion rubber flange gasket seals; the rigid interface generally has a larger ductile iron port, which is directly inserted into the pipe and sealed with cement, which is now mostly eliminated.

　　According to the application: 1. Ductile iron pipe for water supply 2. Ductile iron pipe for drainage 3. Ductile iron pipe for gas supply. Among them, ductile iron pipes for drainage have no water pressure requirements, followed by water supply. There are certain requirements for water pressure and gas supply requirements, especially for high airtightness.

　　http://www.xysteelpipe.com/info/Classification-of-ductile-iron-pipes-1921-1.htm