Why Ductile Iron Pipes Are Used for Rainwater‑Sewage Diversion Renovation?

Traditional drainage pipe networks have long adopted concrete pipes and plastic pipes. However, obvious drawbacks have emerged in rainwater‑sewage diversion projects:

Concrete pipes: Their rigid joints cannot resist subgrade settlement and are prone to cracking and leakage. They feature poor corrosion resistance, with a service life of only 20‑30 years under sewage conditions.

Plastic pipes: Their ring stiffness is greatly affected by temperature. Joints are susceptible to tensile deformation, resulting in insufficient reliability under heavy‑traffic road conditions and deep‑burial backfill scenarios.

Ductile iron pipes perfectly offset these shortcomings: 

★ High strength: Tensile strength reaches 420 MPa, capable of withstanding extrusion during pipe‑jacking construction and pressure from heavy‑duty vehicles. 

★ Flexible and seismic‑resistant: Rubber‑gasket joints allow angular deflection of ±3° and axial expansion‑contraction of 5 mm to cope with geological deformation. 

★ Long‑term corrosion resistance: External zinc coating plus bitumen finishing layer and cement‑mortar lining deliver effective anti‑corrosion performance. 

★ Long service life: Designed service life of 50‑70 years, 20‑30 years longer than conventional pipes. 

★ Complete size range: Full‑size coverage from DN80 to DN3000, meeting all application requirements ranging from residential branch pipes to municipal trunk mains.

Rainwater‑sewage diversion is not a project that can be completed within one or two years; instead, it represents an infrastructure renewal cycle spanning 5‑10 years. For pipe manufacturers, those who build comprehensive advantages in production capacity assurance, full‑range size coverage, anti‑corrosion technologies and delivery speed will secure a leading position amid this market dividend.

Driven by policies and market demands, supported by technological upgrades and proven project references, the golden opportunity for ductile iron pipes in rainwater‑sewage diversion works has arrived. As a professional manufacturer deeply engaged in ductile iron pipe business, our company will keep providing solid support for urban water environment governance with full‑range products, superior anti‑corrosion technologies and reliable delivery performance.