Ductile Iron Pipe
Ductile Iron Pipe (DIP), also known as Nodular Cast Iron Pipe, is a revolutionary piping material developed in the 1950s. By adding magnesium alloy to molten iron, the graphite within the iron matrix forms spherical nodules instead of flakes, achieving a perfect balance of ductility (like steel) and corrosion resistance (like traditional cast iron).
Design Life: 50–100 years, widely used in critical infrastructure.
Global Adoption: Over 70% of water supply networks in Europe and North America use DIP.
Key Features & Advantages
|
Feature |
Technical Details |
Benefit |
|
Ultra-High Strength |
Tensile strength ≥420 MPa, yield strength ≥300 MPa, 3× stronger than gray cast iron. |
Resists ground pressure, traffic loads, and seismic forces. |
|
Superior Flexibility |
Minimum elongation rate 10%, can bend up to 3°–5° without cracking. |
Adapts to soil movement and installation misalignment. |
|
Corrosion Defense |
- Exterior: Zinc spray (≥130 g/m²) + asphalt coating. |
Survives harsh soils and aggressive fluids (pH 5–12). |
|
Leak-Free Joints |
TYTON® push-on joints or mechanical joints (M/F type), tested to 1.5× working pressure. |
Reduces water loss and maintenance costs. |
Applications
|
Field |
Project Examples |
Regional Cases |
|
Municipal Water |
Tokyo Metropolitan Water Supply (Japan), Thames Water (UK), Beijing Water Authority (China). |
DN1200 pipes for urban mains with 6.0 m/s flow rate. |
|
Wastewater |
Singapore Deep Tunnel Sewerage System, Los Angeles Sanitation District. |
Epoxy-lined pipes for corrosive sewage (H₂S resistance). |
|
Industrial |
Oil refinery cooling systems (Saudi Aramco), geothermal plants (Iceland). |
High-temperature resistance up to 80°C with special coatings. |
Dimensional Range
Diameter: DN80–DN2600 (3–102 inches)
Length: 6 meters (standard), customizable up to 9 meters.
Wall Thickness: Class K9/K10/K12, compliant with ISO 2531.
Sustainability & Certifications
Circular Economy: 100% recyclable, with 95% recycled iron content in production.
Carbon Footprint: 30% lower CO₂ emissions compared to steel pipes (ISO 14064 verified).
Certifications:
Water Safety: NSF/ANSI 61, WRAS, KIWA.
Quality Systems: ISO 9001, ISO 2531, GB/T 13295.
Ductile Iron Pipe – The Smart Choice for Sustainable Infrastructure!
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Prefabricated insulated ductile iron Pipe
Prefabricated insulated ductile iron Pipe integrates ductile iron’s strength with pre-installed polyurethane insulation and anti-corrosion layers. It minimizes heat loss for hot water or district heating, withstanding -40℃ to 130℃ temperatures. The prefabricated design skips on-site insulation work, cutting installation time by 60%. Used in municipal heating, industrial fluid transport, it resists corrosion and has a 50+ year service life. Applied in Harbin’s cold-region projects, it ensures stable operation in harsh conditions.
Sewage Pipe
Guoming's Sewage Pipe, typically ductile iron-made, is designed for sewage transport. It resists corrosion from acidic/alkaline wastewater and hydrogen sulfide-induced "crown corrosion" . With reliable gasket seals, it prevents leaks and secondary pollution . Suitable for municipal drainage, industrial wastewater, and residential sewage systems, it handles gravity/pressure flow efficiently . Its robust structure ensures over 50 years of service, lowering maintenance costs for urban and industrial projects .
Special Coating Pipe
Special Coating Pipe is a ductile iron pipe developed by Guoming Ductile Iron Pipes Co., Ltd. to meet different customer needs, with various high-performance internal and external anti-corrosion coatings. Its coatings include zinc-aluminum alloy external anti-corrosion coating, polyurethane internal and external coating, epoxy resin layer, ceramic coating, etc. It is applicable to wet areas like ponds and swamps, saline-alkali land, clay with poor air permeability, industrial parks and other scenarios, effectively resisting corrosion and ensuring long-term stable use of the pipe .
PE Liner Pipe
Product Summary: PE Liner Pipe is a new type of ductile iron pipe of Guoming Ductile Iron Pipes Co., Ltd. It combines the advantages of ductile iron pipes and polyethylene pipes, with good sanitary performance and no easy internal-external delamination. It meets direct drinking water requirements, resists corrosion from special media like seawater and urban sewage, and is mainly used for drinking water and direct drinking water transportation, supporting Guoming's pipeline system.
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