Class K12 DN2400 ductile iron pipe features a 2400 mm internal diameter and a nominal wall thickness of 34.8 mm calculated via the ISO 2531 formula (e = 12·(0.5 + 0.001·2400)). Each 6 m segment is centrifugally cast from GGG50 ductile iron, internally lined with cement mortar per ISO 4179 and externally zinc-sprayed plus bituminous coated per ISO 8179 for superior corrosion resistance. Compliant with ISO 2531/EN 545 (potable water) and EN 598 (sewerage), it is rated PN 25–40 for high-pressure trunk mains and routinely exceeds 100 years of service life, as recognized by DIPRA’s Century Club. Installation is efficient via Tyton push-on, mechanical restraint (AWWA C111) or ANSI B16.1 flanged joints, supporting open-cut, HDD and pipe-jacking methods.
Application Scenarios
Class K12 DN2400 is ideal for:
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Municipal Water Distribution: Serves as primary transmission mains, delivering high volumes with minimal head loss and meeting EN 545 drinking-water purity requirements.
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Sewerage Systems: Smooth cement-mortar lining minimizes hydraulic resistance and reduces blockages in long-distance rising and gravity mains.
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Irrigation & Water Conservancy: Conveys water across varied terrain—canals, reservoirs and agricultural schemes—while withstanding external loads and thermal stresses.
Service Life
Extensive utility records confirm modern ductile iron pipelines surpass 100 years of reliable operation, earning inclusion in DIPRA’s Century Club. Cement-mortar linings (ISO 4179) virtually eliminate internal corrosion, and zinc/bitumen coatings (ISO 8179) provide external sacrificial protection, extending life to 100–125 years with minimal upkeep. Lifecycle analyses demonstrate ductile iron outperforms HDPE (≈50–60 years) and PVC alternatives, reducing replacement frequency and total cost of ownership.
Installation & Connection
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Joint Options: Tyton push-on gaskets per ISO 4633, self-restraining K-type, mechanical restraint (AWWA C111) and ANSI B16.1 flanged connections enable rapid, tool-light assemblies with leak-proof performance under surge.
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Open-Cut & Trenchless: Follows AWWA C600 for open-cut; HDD (up to DN 1000) and pipe-jacking (beyond DN 1000) minimize surface disruption on roads, rivers and sensitive sites.
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Angular Deflection: Socket-spigot joints accommodate ±0.5 % deflection (~±12 mm over 2 m), reducing the need for elbows and fittings in curved alignments.
International Standards
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ISO 2531 / EN 545: Ductile iron pipes, fittings & accessories for potable water.
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ISO 7186 / EN 598: Products for sewerage and wastewater applications.
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ISO 4179: Cement-mortar lining requirements.
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ISO 8179: Zinc coating and bituminous protection.
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ISO 13470: Trenchless jacking pipe components.
Other Series Price Comparison
| Class | Wall Thickness (mm) | Price |
|---|---|---|
| K7 | 7·(0.5+0.001·2400)=20.3 | 400–500 USD/ton |
| K8 | 8·(0.5+0.001·2400)=23.2 | 480–550 USD/ton |
| K9 | 9·(0.5+0.001·2400)=26.1 | 500–600 USD/ton |
| K12 | 12·(0.5+0.001·2400)=34.8 | 558 USD/m (1–49 t), 489 USD/m (50–99 t), 376 USD/m (100+ t) |
Advantages
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High Structural Strength: Resists up to 3× PFA internal pressure and major external loads (traffic, ground settlement).
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Leak-Free Performance: Gasketed and restrained joints maintain integrity under surge and cyclic loading.
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Exceptional Corrosion Resistance: Multi-layer protection (zinc/bitumen/PE sleeving) for varied soil chemistries.
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Long Service Life: Proven 100+ year lifespan minimizes maintenance and replacement.
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Environmental Sustainability: High recycled content; fully recyclable; lower life-cycle carbon footprint versus alternatives.
Frequently Asked Questions
Q1: What defines Class K12?
Calculated by ISO 2531: e = 12·(0.5 + 0.001·DN), yielding 34.8 mm at DN 2400.
Q2: Which standards apply?
ISO 2531/EN 545 (water), ISO 7186/EN 598 (sewerage), ISO 4179 (lining), ISO 8179 (coating) and ISO 13470 (trenchless).
Q3: How long is the service life?
With proper lining/coating, service life routinely exceeds 100 years and can reach 125 years in optimal conditions.
Q4: What installation methods are supported?
Open-cut (AWWA C600), HDD and pipe-jacking, with Tyton push-on, mechanical restraint and flanged joints for fast, secure assembly.
Q5: How does pricing compare?
FOB China rates start at USD 558/m (1–49 t) with volume discounts to USD 376/m (100+ t); per-ton rates for thinner classes range USD 400–600 / ton.
Case Studies
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Global Municipal Water Project (DIPRA): Multiple utilities report successful DN2000–2400 installations, benefiting from long-term reliability and low life-cycle costs.
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Port of Tampa Rehabilitation (JM Eagle): Replaced corroded 35-year-old cast iron mains with ductile iron, resolving aggressive-soil leaks and avoiding repeat failures.
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Wildfire Resilience Test (Materials Performance): A DN2400 pipeline endured controlled wildfire temperatures with negligible integrity loss, confirming ductile iron’s extreme-heat durability.
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 | ….. |
