Large-diameter ductile iron pipes are mainly used in major national water conservancy and livelihood projects such as large-scale water diversion projects, long-distance water transmission projects, and urban infrastructure projects . They provide high-quality pipe materials to enhance the national water network construction, regional water network interconnection, and water resource regulation and supply capabilities, thus ensuring water supply security.
Ductile iron pipes offer a wide range of diameters, meeting the needs of various diameters in long-distance water transmission projects. In long-distance water transmission projects, the main diameter range used is DN1000-DN2600mm. Most water transmission projects utilize pipe diameters of DN1400-DN2400mm.
The corrosion protection of ductile iron pipes is completed in the factory . The inner wall is coated with cement mortar by centrifugation , and the outer wall is sprayed with a zinc coating of 130 grams per square meter (K-grade pipe) or 200 grams per square meter (C-grade pipe) . The final coating is 70-micron asphalt paint .
. In long-distance water transmission projects, the ductile iron pipe joints can adapt to a certain angle of deflection. The deflection of each pipe can realize the deflection of the entire pipeline, and it can also adapt to a certain℃of foundation settlement.
In Tokyo, Japan, the water supply network is almost entirely constructed using centrifugal ductile iron pipes, with a penetration rate as high as 98%. The leakage rate of this water supply network is only 3.3% . Using ductile iron pipes in long-distance water transmission projects can significantly reduce the leakage rate at pipe joints, ensuring the safety and reliability of the water supply network.
Ductile iron pipes have become the standard configuration for major national water diversion projects. Numerous large-scale water diversion initiatives in China have adopted large-diameter ductile iron pipes, achieving significant economic and social benefits while contributing to the security of water supply.
For long-distance water transmission projects with long distances and large scales, the pipelines need to minimize accidents such as pipe bursts and leaks during operation. Ductile iron pipes have excellent internal and external corrosion resistance, long service life, low leakage rate of flexible joints, and low maintenance costs , which can better meet the multiple needs of water transmission projects. Therefore, the application of ductile iron pipes in this field continues to grow rapidly.
Shanxi Jintaihongye Casting & Forging & Machinery Co., Ltdlocated in Shanxi Province, China, is one of the leading manufacturers of ductile iron pipe fittings, pipelines, various valves, and manhole covers, leveraging the region's abundant industrial raw materials.
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