A concise overview of the Class K9 DN2600 Ductile Iron Pipe highlights its suitability for large-diameter water, wastewater, and industrial networks, with a working pressure of 10 bar (tested to 50 bar), a service life exceeding 100 years, and 6 m modular lengths for rapid trench installation. Manufactured per ISO 2531 and EN 545/EN 598, it features cement-mortar lining and zinc-bitumen external coating. Market pricing runs roughly USD 500–800 per ton, competitive versus C-series classes (C25–C40 at USD 493–553 per ton).
Application Scenarios
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Municipal Water Distribution: K9 pipes are widely used in drinking-water mains, offering exceptional strength and corrosion resistance for safe potable delivery.
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Wastewater & Sewage: Corrosion-resistant lining and high pressure tolerance make K9 ideal for gravity and pressurized sewer systems.
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Irrigation & Agriculture: Robust mechanical properties ensure reliable long-run conveyance under varying soil conditions.
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Industrial & Fire-Protection Mains: High tensile strength and tight joint seals support process water, cooling circuits, and fire-fighting networks.
Service Life
Modern ductile iron and cement-mortar linings virtually eliminate internal corrosion, delivering a design life ≥ 100 years in typical soil and water environments. Its high recycled-content iron also supports sustainability goals through lifecycle energy savings.
Installation & Connection
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Lengths & Handling: Supplied in 6 m (or container-ready 5.7 m) sticks for efficient transport and trench alignment.
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Joint Options:
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Push-on (Tyton/T-type): Fast, flexible assembly with resilient rubber seals.
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Mechanical & Self-Anchored: Restrained joints for high-pressure segments.
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Flanged: Per project specification with ANSI/AWWA C115 or equivalent.
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Coatings & Linings:
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Internal: Portland cement-mortar lining for potable water compliance.
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External: Zinc + bitumen (70 µm), fusion-bonded epoxy, or zinc-aluminum + epoxy available.
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International Standards
Manufactured to meet:
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ISO 2531 (ductile iron pipe dimensions, tolerances, coatings)
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EN 545 / EN 598 (water and wastewater applications)
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AWWA C151 / C104, BS EN 545, AS/NZS 2280 (on request)
Price Comparison with Other Series
| Class | Price Range (USD/ton) | |
|---|---|---|
| K9 (DN2600) | 500 – 800 | |
| C25 (various DN) | 493 – 553 | |
| C30 / C40 | 493 – 553 (typical range) |
Note: Final quotes depend on volume, coatings, joint type, and logistics.
Advantages
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High Mechanical Strength: Tensile ≥ 420 MPa; yield ≥ 43 500 psi.
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Corrosion Resistance: Cement-mortar lining minimizes internal corrosion.
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Long Service Life: Proven ≥ 100 years under field conditions.
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Pressure Capacity: Rated PN 10 (10 bar), tested up to PN 50 (50 bar).
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Sustainability: High recycled content and energy-efficient manufacturing.
FAQ
Q1: What defines “Class K9”?
A: Under ISO 2531, “K9” specifies a nominal wall-thickness series for PN 10 applications, balancing strength and weight for large-diameter pipes.
Q2: How long will DN2600 K9 pipes last?
A: With proper installation and environment, service life exceeds 100 years, per DIPRA longevity studies.
Q3: Which joint types are offered?
A: Push-on (Tyton/T-type), mechanical, self-anchored, and flanged ends are all available to suit project needs.
Q4: Is cement-mortar lining safe for drinking water?
A: Yes—Portland cement mortars meet ANSI/NSF-61 criteria for potable-water applications.
Case Studies
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Central Arkansas Water: Transitioned to zinc-coated ductile iron, citing enhanced strength and adaptability, with DIPRA reporting superior long-term performance and maintainability.
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WSSC, Laurel MD: Switched to ductile iron mains for improved sustainability metrics and corrosion control.
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Various U.S. Utilities: Over 100-year-old ductile iron mains still in service underscore unmatched reliability.
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 | ….. |
