Class K12 DN600 ductile iron pipe delivers a robust 600 mm waterway capable of withstanding up to 16 bar, featuring cement-mortar lining and zinc/bitumen external coatings for 100+ years of service life . Its push-on or restrained rubber-ring joints speed installation and accommodate ground movement, while ISO 2531/EN 545/EN 598 compliance guarantees global acceptance. Priced between USD 432–632 per ton, Class K12 balances upfront capital with minimal life-cycle costs, making it ideal for municipal, industrial, and irrigation networks worldwide .
Application Scenarios
Municipal water-supply systems rely on DN600 K12 pipes to transport potable water under pressures up to 16 bar, meeting BS EN 545 flow and safety requirements .
Sewerage and pressure-sewer networks use DN600 lines with EN 598 certification to convey effluent while resisting internal corrosion, reducing maintenance in high-use districts .
Industrial and power-plant cooling circuits benefit from ductile iron’s high tensile strength (≥ 420 MPa) and elongation (≥ 10 %), ensuring reliability under cyclic loads and heavy mechanical stress .
Agricultural irrigation installations exploit the pipe’s durability in aggressive soils when wrapped with polyethylene sleeving per AWWA C105/A21.5, ensuring continuous water delivery to crops .
Service Life & Durability
Modern ductile iron pipes are engineered for an expected life of 100+ years under normal conditions, outperforming alternatives in longevity and sustainability .
Protected pipes—cement-mortar lined (ISO 4179) internally and zinc/bitumen coated (ISO 8179) externally—require virtually no major maintenance, even in corrosive environments .
Infographics show ductile iron’s low life-cycle cost stems from minimal operating expenses and recyclability, further reducing environmental impact .
Laying & Connection
Push-On or Positive-Locking Joints
Rubber-ring (SRDiP) joints allow quick push-on assembly without thrust blocks, enabling angular deflections of ±5° per joint to absorb ground movements and seismic forces .
VonRoll’s positive-locking system permits rapid installation and dismantling with no pipe damage, and pipes can be reused across projects .
Restrained & Flanged Variants
For high-thrust applications—steep slopes or anchor points—restrained (TLH-type) joints lock spigot to socket via cast-on lugs, eliminating the need for concrete anchor blocks .
Flanged ends (EN 1092-2) are available for above-ground or maintenance-intensive sections, speeding segment replacement during repairs.
Compliance with International Standards
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ISO 2531: Ductile iron pipe dimensions and wall-thickness classes (K7–K12).
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EN 545/EN 598: Water and sewer pipeline requirements, pressure testing at 1.5× PN.
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ISO 4179 / Cement-mortar lining: Internal corrosion protection.
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ISO 8179 / External coatings: Zinc-aluminium and bitumen or epoxy layers for chemical resistance.
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ISO 9001: Quality-management certification across manufacturing.
Price Comparison with Other Series
| Thickness Class | Price (USD/ton) |
|---|---|
| K7 | 460 – 500 |
| K8 | 480 – 560 |
| K9 | 500 – 600 |
| K12 (DN600) | 530 (1–24 t), 499 (25–49 t), 449 (50+t) <br/>432 – 632 |
| C25 | 400 – 500 |
| C40 | 545 – 645 |
Key Advantages
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High Pressure Rating: PN 16 (16 bar) for large distribution networks.
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Outstanding Ductility & Strength: Spheroidal graphite microstructure, Rp0.2 ≥ 300 MPa, A ≥ 10 %.
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Exceptional Corrosion Resistance: Multi-layer linings/coatings plus PE sleeving.
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Rapid Installation: Push-on joints cut trench time by up to 30 %.
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Low Life-Cycle Cost: Minimal maintenance and recyclability yield cost-savings over a century.
Frequently Asked Questions
Q1: What is the maximum operating pressure?
Class K12 pipes are rated PN 16 (16 bar) at ambient temperatures, hydrostatically tested to 1.5× rating for safety .
Q2: When are restrained joints essential?
Use restrained or flanged joints on steep grades, anchor points, or seismic zones to prevent joint separation under thrust .
Q3: Are joint gaskets potable-water approved?
Yes—SBR, NBR, and EPDM gaskets comply with WRAS, NSF 61, and equivalent global standards.
Case Studies
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Arizona Water Service Ban on PVC: Eight providers (Phoenix, Mesa, Scottsdale, Tempe) mandate ductile iron, citing longevity and leak-resistance advantages .
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Eastern Terrace Watermain Upgrade (New Zealand): Installation of 2 455 m of DN600 ductile iron mains reduced leakage by 40 % and improved network reliability .
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Chessy City Leak Repair (France): Two DN600 UltraGrip couplings (7 bar) sealed a residential network leak in under 2 hours, illustrating ease of emergency response .
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Primus Line Rehabilitation (Australia): A 2.2 km DN600 cast-iron trunk main was relined with a DN500 PN 16 liner, restoring service at 11.3 bar without excavation .
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 | ….. |
