Discover the Class K9 DN250 Ductile Iron Pipe, engineered for high-pressure water and gas transmission. Compliant with ISO 2531 and GB/T 13295-2019 standards, this pipe features a robust cement lining, zinc-bitumen coating, and flexible push-in joints. Ideal for municipal, industrial, and agricultural applications, it offers a 50+ year lifespan, superior corrosion resistance, and easy installation.
Application Scenarios
The K9 DN250 ductile iron pipe is widely used in:
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Municipal Water Supply: Ensures leak-free water distribution with a pressure rating of 50 bar (DN100-300) and 32 bar (DN800-1000).
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Industrial Pipelines: Transports oil, gas, and chemicals safely, even in corrosive environments like coastal regions.
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Fire Protection Systems: Combines high strength (ISO 2531-certified) with seismic flexibility for disaster-resilient infrastructure.
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Agricultural Irrigation: Resists soil stress and corrosion, ideal for long-term underground use.
Lifespan & Durability
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50+ Years: Enhanced by a dual-layer coating (130g/m² zinc + 70μm bitumen) and cement mortar lining per ISO 4179/8179.
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Corrosion Resistance: Outperforms PVC and steel pipes in acidic/alkaline soils, reducing maintenance costs by 30%.
Installation & Connection
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Flexible Push-in Joints: Allow 15° deflection and rapid assembly using stainless steel clamps and EPDM rubber seals.
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Key Steps:
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Cut pipes smoothly to avoid damaging seals.
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Align pipes and secure with clamps (torque: 20-25 Nm).
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Pressure-test at 1.5× working pressure for safety.
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K7, K8, K9, K12 Series Comparison
| Grade | Wall Thickness (mm) | Pressure Rating | Price (USD/m) |
|---|---|---|---|
| K7 | 6.3 | 25 bar | 55 |
| K8 | 7.1 | 32 bar | 65 |
| K9 | 8.0 | 50 bar | 85 |
| K12 | 10.2 | 65 bar | 120 |
Why Choose K9?
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Cost-Effective: Balances strength (K-value 9) and affordability for medium-pressure systems.
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Global Compliance: Meets ISO 2531 and GB/T 13295-2019 (C-class equivalence).
International Standards
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ISO 2531: Defines hydraulic pressure testing (50 bar for DN100-300).
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GB/T 13295-2019: Upgrades from wall-thickness (K-grade) to pressure-based (C-grade) classification while retaining compatibility.
Key Advantages
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Superior Strength: Tensile strength ≥420 MPa, 10x higher than traditional cast iron.
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Earthquake Resistance: Absorbs ground shifts without leakage.
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Low Friction Loss: Smooth cement lining reduces energy consumption by 15%.
Case Studies
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Egypt’s Alexandria Port Project: 8,000m of K9 DN250 pipes installed for seawater desalination (2023).
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China’s JinGang LuoKaiWei Steel Group: Exported K9 pipes to 46+ countries, including Central America.
FAQs
Q: Can K9 pipes handle high-temperature fluids?
A: Yes, safely up to 50°C (per GB/T 13295).
Q: How does K9 compare to PE pipes?
A: K9 outperforms PE in pressure capacity (+30%) and lifespan (+20 years) but requires skilled installation.
ductile iron pipe dimensions
| Pipe body weight （kg/m) | |||||||||||||||
| (Inside Diameter) | (Outside Diameter) | Socket Weight | K8 | K9 | K10 | C class | Total weight of Active Length=6M (kg) | Total weight of Active Length=5.7M (kg) | |||||||
| DN(mm) | OD(mm) | ≈ kg | Class | kg/m | K8 | K9 | K10 | C class | K8 | K9 | K10 | C class | |||
| 80 | 98 | 3.40 | 12.20 | 12.20 | 12.20 | C40 | 9.10 | 77.00 | 77.00 | 77.00 | 58.00 | 73.00 | 73.00 | 73.00 | 55.00 |
| 100 | 118 | 4.30 | 14.90 | 15.10 | 15.10 | C40 | 11.12 | 93.70 | 95.00 | 95.00 | 71.00 | 90.00 | 91.00 | 90.00 | 68.00 |
| 125 | 144 | 5.70 | 18.90 | C40 | 119.00 | ||||||||||
| 150 | 170 | 7.10 | 21.80 | 22.80 | 22.80 | C40 | 16.48 | 138.00 | 144.00 | 144.00 | 106.00 | 132.00 | 138.00 | 137.00 | 101.00 |
| 200 | 222 | 10.30 | 28.70 | 30.60 | 30.60 | C40 | 22.62 | 183.00 | 194.00 | 194.00 | 146.00 | 174.00 | 185.00 | 185.00 | 139.00 |
| 250 | 274 | 14.20 | 35.60 | 40.20 | 44.30 | C40 | 32.63 | 228.00 | 255.00 | 280.00 | 210.00 | 218.00 | 244.00 | 267.00 | 200.00 |
| 300 | 326 | 18.90 | 45.30 | 50.80 | 56.30 | C30 | 43.90 | 290.00 | 323.00 | 357.00 | 282.00 | 278.00 | 309.00 | 340.00 | 269.00 |
| 350 | 378 | 23.70 | 55.90 | 63.20 | 69.60 | C30 | 51.88 | 359.00 | 403.00 | 441.00 | 335.00 | 343.00 | 384.00 | 420.00 | 319.00 |
| 400 | 429 | 29.50 | 67.30 | 75.50 | 83.70 | C30 | 60.78 | 433.00 | 482.00 | 532.00 | 394.00 | 414.00 | 460.00 | 506.00 | 376.00 |
| 450 | 480 | 38.30 | 80.00 | 89.30 | 99.00 | C30 | 73.30 | 515.00 | 575.00 | 632.00 | 472.00 | 492.00 | 550.00 | 597.00 | 450.00 |
| 500 | 532 | 42.80 | 92.80 | 104.30 | 115.60 | C30 | 87.20 | 600.00 | 669.00 | 736.00 | 566.00 | 572.00 | 638.00 | 702.00 | 540.00 |
| 600 | 635 | 59.30 | 122.00 | 137.30 | 152.00 | C30 | 120.62 | 791.00 | 882.00 | 971.00 | 783.00 | 755.00 | 842.00 | 926.00 | 747.00 |
| 700 | 738 | 79.10 | 155.00 | 173.90 | 193.00 | C25 | 142.15 | 1009.00 | 1123.00 | 1237.00 | 932.00 | 963.00 | 1071.00 | 1179.00 | 889.00 |
| 800 | 842 | 102.60 | 192.00 | 215.20 | 239.00 | C25 | 177.07 | 1255.00 | 1394.00 | 1537.00 | 1165.00 | 1197.00 | 1330.00 | 1465.00 | 1112.00 |
| 900 | 945 | 129.60 | 232.00 | 260.20 | 289.00 | C25 | 197.68 | 1521.00 | 1691.00 | 1863.00 | 1446.00 | 1452.00 | 1613.00 | 1777.00 | 1257.00 |
| 1000 | 1048 | 161.30 | 275.00 | 309.30 | 343.20 | C25 | 266.28 | 1811.00 | 2017.00 | 2221.00 | 1759.00 | 1729.00 | 1925.00 | 2118.00 | 1679.00 |
| 1100 | 1152 | 194.70 | 362.80 | 2372.00 | |||||||||||
| 1200 | 1255 | 237.70 | 374.00 | 420.10 | 466.10 | C25 | 373.88 | 2482.00 | 2758.00 | 3034.00 | 2481.00 | 2370.00 | 2632.00 | 2894.00 | 2369.00 |
| 1400 | 1462 | 279.30 | 547.20 | 3563.00 | |||||||||||
ductile iron pipe Mechanical property
| Mechanical Property | |||||||
| Nominal Diameter | Hydraulic test | Tensile strength | Elogation | Yield strength | Bending strength | Brinell hardness | Thickness of cement lining |
| DN(MM) | Mpa | Mpa | % | Mpa | Mpa | HB | mm |
| DN80-DN300 | 5 | ≥420 | ≥10 | ≥300 | ≥590 | ≤230 | 3 |
| DN350-DN600 | 4 | ≥420 | ≥10 | ≥300 | ≥590 | ≤230 | 5 |
| DN700-DN1000 | 3.2 | ≥420 | ≥10 | ≥300 | ≥590 | ≤230 | 6 |
| DN1100-DN1600 | 2.5 | ≥420 | ≥7 | ≥300 | ≥590 | ≤230 | ….. |
