The Class K12 DN400 ductile iron pipe offers a high-pressure, long-life solution for water, sewage, and industrial pipelines. Engineered to ISO 2531 / EN 545 standards, it combines superior tensile strength, corrosion protection, and ease of installation via mechanical K-type joints. With an expected service life exceeding 100 years and competitive pricing across thickness classes, this pipe is ideal for municipal and industrial projects worldwide.
Application Scenarios
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Municipal Water Supply: Commonly used in drinking-water mains up to DN 1200 mm, K12 pipes handle pressures up to 16 bar, ensuring safe, clean delivery to homes and businesses .
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Sewage & Irrigation: Resistant to internal and external corrosion when cement-mortar lined, they serve reliably in sewer networks and agricultural irrigation systems.
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Industrial & Power Plants: Their high tensile strength suits high-stress environments—chemical plants, power-station cooling circuits, and mine dewatering .
Service Life & Durability
Modern ductile iron pipe boasts an expected life of over 100 years under normal conditions, thanks to GGG50 grade iron and advanced linings. Even in corrosive soils, polyethylene encasement or high-aluminum mortars protect the pipe, preventing degradation and extending service life .
Laying & Connection
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Mechanical K-Type Joints: Integrated sockets with resilient gaskets allow quick, leak-free assembly and ±5° angular deflections to accommodate ground movement.
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Flanged & Restrained Options: Flanged ends per EN 545 and restrained-joint alternatives ensure rigid anchoring in thrust-resistant installations.
Compliance with International Standards
Manufactured under ISO 2531, EN 545, EN 598 and certified to ISO 9001, these pipes meet global quality benchmarks for dimensions, pressure ratings, and testing procedures. External zinc-bitumen coatings and WRAS-approved linings ensure potable-water compliance in Europe and beyond.
Price Comparison with Other Series
| Thickness Class | Typical Price (USD/ton) | Notes |
|---|---|---|
| K7 | 520 – 550 | Lower wall thickness, PN10 service lines |
| K9 | 520 – 550 | Standard for medium‐pressure mains |
| K12 | 559 (1–24 t)<br/>536 (25–99 t) | Higher wall thickness for ≥16 bar |
| C25 | 400 – 500 | Cement-lined, PN16 |
| C40 | 545 – 645 | Thickest wall, PN40 |
Advantages of Class K12 DN400 Pipe
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High Pressure Capacity: Up to 16 bar operating pressure, suitable for large-diameter mains.
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Excellent Ductility: GGG50 iron provides 270 MPa proof stress and ≥7% elongation after fracture.
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Superior Corrosion Resistance: Cement-mortar or epoxy-ceramic linings plus zinc-bitumen coating.
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Low Lifecycle Cost: Although initial capital cost is higher, operating costs are minimal over a 100+ year lifespan.
Frequently Asked Questions
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What soil conditions require additional protection?
Aggressive, acidic, or highly saline soils call for polyethylene encasement per ANSI/AWWA C105/A21.5. -
Can the pipe handle seismic activity?
Yes—mechanical joints permit angular deflection and axial movement, absorbing ground shifts. -
Are fittings and valves available?
Full range of bends, tees, hydrants, and restrained joints to EN 545/EN 598 are supplied.
Customer Case Studies
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Monte Vista Water District (CA, USA): “We get 100–125 years of service versus other materials,” confirming life-cycle value for residents.
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Central Arkansas Water: Over 150 years of service in cast-iron mains; recent ductile installations continue this legacy in high‐stress urban pipelines.
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 | ….. |
