Performance comparison between ductile iron pipe and common cast iron pipe

The production process of ductile iron pipe is to add alkaline earth metals or rare metals such as magnesium and calcium to the raw materials of ordinary cast iron pipes. The casting process of ductile iron pipes includes continuous casting, hot mold casting and water-cooled centrifugal casting. Among them, the water-cooling method is the most advanced process in the world today. The technical performance of ductile iron with different processes, compared with ordinary cast iron pipes, not only maintains the corrosion resistance of ordinary cast iron pipes, but also has the advantages of high strength, good toughness, thin wall, light weight, impact resistance, large bending performance, and easy installation. Therefore, ductile iron pipes are not only widely used abroad, but also well promoted and used in China. In many areas of my country, ductile iron pipes have been widely used in medium and small diameter water supply pipes.

Comparison of the performance of ductile iron pipes and steel pipes:

Steel pipes can be divided into seamed steel pipes and seamless steel pipes. Seamed pipes are generally used in water supply pipes. Compared with ductile iron pipes, steel pipes have the advantages of good toughness, high tensile strength, thin wall, high pressure resistance, long pipe length, and few interfaces. The biggest disadvantage is poor corrosion resistance and high price. Therefore, under normal circumstances, except for small-diameter pipes and special projects.

Comparison of the performance of ductile iron pipes and prestressed reinforced concrete pipes:

Ductile iron pipes and prestressed reinforced concrete pipes (suitable for large-diameter pipes, the maximum diameter has exceeded 2000) have the following characteristics:

(1) Energy saving, the main materials are sand and stone, which can be obtained locally.

(2) Heavy weight, brittle texture, difficult to cut, and relatively difficult to construct.

(3) The working pressure is 20% to 40% lower than that of ductile pipes, which is 0.15-0.25MPa.

(4) The maximum deflection angle is 1.5 degrees, while the maximum deflection angle of ductile iron pipes can reach 3.0 degrees. Therefore, the terrain adaptability of prestressed reinforced concrete pipes is poor.

Performance comparison between ductile iron pipe and PVC plastic pipe:

Compared with ductile iron pipe, PVC pipe has the characteristics of smooth inner wall, light weight, corrosion resistance, good anti-scaling performance and low price, but it also has many disadvantages, mainly the following points:

(1) Easy to age, large thermal expansion and contraction, not suitable for long-term exposure to sunlight, storage room temperature should not be greater than 40℃.

(2) Low strength, poor compressive performance, improper construction can easily cause deformation.

(3) Poor rigidity and flexibility, easy to cause leakage.