Ductile iron pipe (DIP) is a high-strength ferritic matrix material with spheroidal graphite inclusions, created by adding magnesium to molten iron. This revolutionary structure delivers:
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Impact toughness 10× higher than gray iron
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Elastic deformation capacity comparable to steel
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100+ year service life with proper corrosion control
Our pipes comply with ISO 2531, EN 545, AWWA C151/A21.51, and K9/K10 pressure classes.
Why Choose Luokaiwei’s Ductile Iron Pipes?
| Advantage | Technical Benefit | Project Impact |
|---|---|---|
| Unmatched Longevity | 100-year design life vs. 50 years for PVC/HDPE | Reduces lifetime costs by 40% |
| Extreme Burst Pressure | Min. 500 MPa tensile strength (K12 class available) | Withstands 5× working pressure |
| Earthquake Resilience | 7% elongation before fracture | Survives seismic zone 9 ground acceleration |
| Corrosion Defense | Zinc + bitumen/epoxy coating (C40/C50 certified) | Passes 3,000-hour salt spray test |
| Sustainable Manufacturing | 95% recycled iron content; 30% lower carbon than steel | Meets UN SDG 11/12 targets |
Technical Specifications
Table 1: Composition & Mechanical Properties
| Parameter | Luokaiwei DIP | Gray Iron | Class 150 Steel |
|---|---|---|---|
| Carbon (C) | 3.5–3.9% | 3.0–3.5% | ≤0.25% |
| Silicon (Si) | 1.8–2.8% | 1.5–2.2% | – |
| Tensile Strength | 500 MPa min | 250 MPa max | 485 MPa |
| Yield Strength | 300 MPa min | N/A | 275 MPa |
| Elongation | 7% min | 0% | 23% |
Table 2: Pressure Class Comparison (DN100–DN1200)
| Class | Working Pressure (MPa) | Burst Pressure (MPa) | Wall Thickness (mm) |
|---|---|---|---|
| K9 | 1.6–3.2 | 7.5–15.0 | 6.1–15.3 |
| K10 | 2.0–4.0 | 9.4–18.8 | 7.2–18.9 |
| K12 | 2.5–5.0 | 11.7–23.4 | 8.8–22.1 |
Core Applications
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Municipal Water Supply:
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Primary transmission mains (DN80–DN2600)
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Fire protection systems (EN 10255 compliant)
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Wastewater Transport:
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Sewer force mains resisting H₂S corrosion
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Sludge pipelines with abrasion-resistant cement lining
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Industrial Systems:
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Mine dewatering pipelines (ISO 2531 PN40 rating)
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Power plant cooling water circuits
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Irrigation Infrastructure:
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High-pressure center pivot systems (AWWA C110 fittings)
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Dam outlet works
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Luokaiwei’s Manufacturing Excellence
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Raw Material Control:
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94% recycled steel scrap + 6% proprietary inoculants
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Spectrometer-verified chemistry (CE = 4.3–4.5)
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Centrifugal Casting:
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Horizontal Spin Casting: DN80–DN1000 at 900–1,100 RPM
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Vertical Casting: DN1000–DN2600 with controlled solidification
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Annealing & Quenching:
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920°C austempering → 370°C isothermal transformation → water quenching
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Lining & Coating:
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Internal: Portland cement mortar (C40/C50) or polyurethane
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External: Zinc spray (130g/m²) + epoxy/bitumen fusion-bonded
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Quality Verification:
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Hydrostatic test at 2.5× working pressure
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Ultrasonic wall thickness mapping
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Graphite nodularity ≥85% (ISO 945)
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Installation Best Practices
✅ Engineering Guidelines:
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Trench Preparation:
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Minimum bedding: 150mm compacted sand (95% Proctor density)
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Embedment angle: 30°–45° for DN ≥600
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Joint Assembly:
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Push-Fit T-Joints: Rubber gasket lubrication with silicone
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Flanged Connections: Bolt torque = 30% yield strength
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Corrosion Protection:
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Cathodic protection: -0.85V CSE potential
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Polyethylene encasement for aggressive soils
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⚠️ Critical Prohibitions:
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Never: Weld on-site (causes cement lining failure)
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Avoid: Direct contact with copper/brass fittings
5 Essential FAQs
Q1: What lifespan can I expect from your pipes?
A: 100+ years in soils with resistivity >500 Ω-cm. We provide corrosion rate calculations based on your soil reports.
Q2: How do you prevent internal corrosion in wastewater pipes?
A: Our dual defense system:
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Cement Lining: Maintains pH >10 at pipe wall
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Polyurethane Seal: For H₂S >50 ppm environments
Q3: Can DIP withstand water hammer pressure?
A: Yes. Our K12 class pipes survive surge pressures ≤23.4 MPa – backed by hydraulic transient analysis reports.
Q4: What joint systems do you offer?
| Type | Max Deflection | Pressure Rating | Install Speed |
|---|---|---|---|
| T-Joint (Rubber) | 5° | PN25 | 40m/hr |
| Flanged (EN 1092) | 0° | PN40 | 15m/hr |
| Mechanical | 15° | PN16 | 60m/hr |
Q5: Do you supply earthquake-resistant fittings?
A: Yes – our Seismic Flex Couplings allow:
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±150mm axial movement
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±5° angular deflection
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DN100–DN600 available
Why Partner with Luokaiwei?
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Global Project Experience:
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500km+ installed in ASEAN water grids
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120+ municipal water projects in Africa
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Certifications:
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ISO 9001 / 14001 / 45001
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WRAS Approval (UK Water Regulations)
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NSF/ANSI 61 Drinking Water Certification
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Value-Added Services:
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On-site jointing training
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Free hydraulic modeling
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Pipeline health monitoring systems
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Order Your Certified Ductile Iron Pipes Today!
✅ Lead Time: 60 days for 10,000+ tons
✅ Packaging: Anti-corrosion VCI film + wooden cradles
✅ Documentation: EN 10204 3.1/3.2 + NDT reports
Contact Luokaiwei:
📧 [email protected]
📱 +86 18912200505