Ductile iron pipe, also known as centrifugal ductile iron pipe, combines the properties of both iron and steel. It offers excellent corrosion resistance, high ductility, superior sealing performance, and is easy to install. This type of pipe is widely used in municipal water supply systems, gas transmission, industrial and mining enterprises, and oil pipelines. As the preferred choice for water supply pipes, it provides a remarkable cost-to-performance ratio.
Compared to PE (polyethylene) pipes, ductile iron pipes are easier and faster to install. Once installed, they offer better internal and external pressure resistance. In terms of sealing and corrosion resistance, spheroidal iron pipes perform better after installation. Additionally, various anti-corrosion measures can further enhance their durability. From a hydraulic performance perspective, ductile iron pipes typically specify the inner diameter, while PE pipes use the outer diameter. Therefore, under the same specifications, ductile iron pipes allow for greater flow capacity. When considering overall installation and maintenance costs, ductile iron pipes provide a more favorable cost-performance ratio.
The main components of ductile iron pipes include carbon, silicon, manganese, sulfur, phosphorus, and magnesium. To improve corrosion resistance, the inner walls are often coated with zinc spray or cement mortar. Advantages of ductile iron pipes include high tensile strength—three times that of gray cast iron pipes—and good impact resistance with elongation rates ranging from 5% to 15%. They outperform steel pipes in terms of corrosion resistance and toughness, though their price is slightly higher than that of steel pipes.
However, despite its superior corrosion resistance compared to steel pipes, ductile iron pipes have thinner walls, which makes them more prone to perforation when buried in soil. If external corrosion protection is inadequate, perforation can occur within 5 to 8 years. In corrosive soils, the corrosion rate can reach 0.5 to 1.5 mm per year. Therefore, proper external corrosion protection is essential, but ensuring this during production, construction, and installation can be challenging, increasing the risk of potential accidents.
The inner lining is usually made of cement mortar. However, in some cases, this coating can affect water quality. Experiments have shown that if the mortar is exposed to lime-soluble water, it may dissolve, leading to damage and alkalization of the water. This increases the pH level, raises chlorine consumption, and negatively impacts the disinfection effect. Additionally, since cement and cast iron have different mechanical properties, the cement mortar lining is more susceptible to cracking under external impacts, internal pressure, and temperature changes. This can result in moisture penetration, peeling off, and increased water resistance, ultimately affecting the quality of the water being transported.
This information is provided by 51 Steel Pipe Network.
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