Class K12 DN100 ductile iron pipe is a robust, 100 mm (DN100) nominal diameter pipeline solution rated for 12 bar working pressure, designed for potable water, wastewater, fire protection, and industrial fluid systems. Its optimized wall thickness (approximately 7 mm) and high-tensile ductile iron construction ensure both mechanical strength and flexibility under dynamic loads. Featuring cement-mortar internal lining and fusion-bonded epoxy or bitumen external coatings, this pipe achieves proven corrosion resistance and a service life exceeding 100 years in typical buried or submerged installations. Versatile jointing options—including push-on, mechanical, and self-restraining systems—simplify installation in trench and trenchless projects while maintaining leak-tight integrity. Conforming to ISO 2531, EN 545, EN 598, ASTM A 536, and GB 13295 standards, Class K12 DN100 pipes enjoy global acceptance and ease of procurement across major markets.
Application Scenarios
Class K12 DN100 pipes serve as the backbone of municipal potable water networks, efficiently conveying treated drinking water from treatment facilities to residential and commercial users. Their smooth cement-mortar lining also makes them ideal for sewer and wastewater force mains, reducing friction losses and minimizing sediment buildup over time. In fire protection systems, the 12 bar rating ensures rapid, high-flow delivery to hydrants and sprinklers during emergencies. Industrial plants utilize these pipes for process water, cooling circuits, and chemical transfer, benefiting from their impact resistance and dimensional stability. Additionally, their weight and coating resilience make them suitable for subaqueous crossings and trenchless installations in corrosive soils or seismic regions.
Service Life
Modern ductile iron pipes consistently demonstrate lifespans exceeding 100 years, thanks to advanced metallurgy and protective linings that inhibit internal and external corrosion. Independent studies confirm that, under normal operating pressures and proper installation, pipe integrity remains uncompromised for over a century, outperforming alternative materials such as PVC and HDPE in full-life cost analyses.
Installation & Jointing
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Push-On Joints: Quick assembly using EPDM rubber gaskets inside bell-and-spigot ends allows for fast trench work and minimal specialized tooling.
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Mechanical (Flanged) Joints: Bolted couplings deliver axial restraint and elevated pressure capabilities (up to PN25), supporting high-pressure zones and recurrent maintenance.
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Self-Restrained Joints: Integral locking features within the bell eliminate external thrust blocks, streamlining installation in direction changes and reducing excavation footprint.
Pipe and joint assemblies can be further safeguarded with polyethylene encasement (Method A), wrapping each barrel and joint to block stray current and stray corrosive elements.
International Standards
Class K12 DN100 ductile iron pipes meet or exceed the following specifications:
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ISO 2531:2015 – Covers pipe dimensions, testing, and lining requirements for water pipelines.
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EN 545:2010 – Specifies requirements for ductile iron pipes, fittings, and accessories for water supply.
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EN 598:2007 – Defines standards for sewerage applications including force mains and gravity sewers.
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ASTM A 536 / C 151 – American standards detailing ductile iron material and pressure ratings.
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GB 13295 – Chinese national standard delineating ductile iron pipe quality and coating methods.
Price Comparison with Other Series
| Series/Class | DN100 Price (USD per m) | Typical Markets |
|---|---|---|
| Class K9 | 380 – 550 | China, India (approx. $130 – $170) |
| Class K12 | 425 – 720 | China, Europe, Middle East |
| PN10 (C25) | 350 – 500 | Europe, North America |
| PN16 (C30) | 450 – 680 | Global major projects |
Prices vary by coating, joint type, volume, and region; consult local suppliers for precise quotes.
Key Advantages
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Extended Lifecycle: Over 100 years of service mitigates replacement costs and network shutdowns.
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High Pressure Tolerance: 12 bar working pressure supports fire mains and industrial demands without upsizing.
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Superior Corrosion Protection: Cement-mortar linings and fusion-bonded epoxy or bitumen coatings guard against internal and external deterioration.
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Versatile Installation: Multiple jointing systems and encasement options adapt to trench, trenchless, and seismic requirements.
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Sustainability: High recycled content and full recyclability align with environmental and circular economy goals.
Frequently Asked Questions
Q1: What does “DN100” signify?
A: “DN100” denotes a nominal pipe diameter of 100 mm, reflecting internal flow capacity according to ISO 3 standards.
Q2: How do I choose between Class K9 and Class K12?
A: Select based on required pressure rating and expected lifespan; K12 offers higher working pressure (12 bar vs. 9 bar) and thicker walls for demanding applications.
Q3: Are these pipes suitable for trenchless installations?
A: Yes—ductile iron’s ductility, combined with self-restraining joints and robust coatings, makes DN100 pipes optimal for HDD and microtunneling projects.
Case Studies
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Central Arkansas Water (USA) upgraded over 50 km of aging mains to ductile iron, achieving a 75% reduction in break rates and saving millions in replacement and operational costs over a decade.
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European Municipal Renewal: Several cities replaced gray iron sewers with Class K12 DN100 mains, reporting zero failures and enhanced hydraulic performance across 20 years of service.
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 | ….. |
