Class K12 DN1000 ductile iron pipe features a nominal wall thickness of 18 mm, calculated by ISO 2531’s formula e = K × (0.5 + 0.001 × DN) (K = 12, DN = 1000). It supports pressure classes up to PN 16 for water and sewage mains, with flanged options rated to PN 25–40 for industrial use. A centrifugally applied cement–mortar lining and zinc/bitumen or epoxy external coatings ensure corrosion resistance and maintain hydraulic efficiency over time. Material strength (GGG50) provides a tensile strength ≥ 420 MPa and minimum elongation ≥ 7 %, delivering resilience under surge and seismic loads. With push-on “Tyton” (ANSI/AWWA C111), mechanical (C111), and bolt-on flanged (ANSI/AWWA C115 or EN 1092-2) joints, field installation is fast, flexible, and leak-tight. Manufactured to ISO 2531, EN 545, EN 598, AWWA C151/C153 and ANSI B16.1/C115 standards, these pipes boast a design life exceeding 100 years, extending to 110 years in aggressive soils.
Application Scenarios
Potable Water Distribution
Large-diameter DN1000 mains reduce friction losses, sustaining Hazen–Williams coefficients above 130 for decades thanks to smooth cement–mortar lining that resists tuberculation and biofilm build-up. Municipalities globally choose DN1000 K12 for trunk mains in both urban and rural settings, optimizing flow capacity while minimizing pumping energy.
Sewage & Wastewater
Tyton and mechanical joints prevent infiltration/exfiltration in gravity and rising mains, while cement lining withstands abrasive solids, making K12 DN1000 ideal for large-scale sewer networks. Its robust external coatings guard against aggressive chemicals and soil strains common in treatment plant outfalls.
Irrigation Systems
Projects like Saint-Gobain PAM’s IRRIGAL DN1000 range leverage BioZinalium® coatings and EPDM gaskets for fertilizer-rich soils, enabling tool-free, watertight installation across agricultural grids. High surge resilience supports variable flow demands, from drip lines to flood irrigation.
Fire Protection & Industrial
Compatible with FM/UL-approved grooved fittings and ANSI/AWWA C115 flanges rated PN 25–40, DN1000 K12 pipes facilitate rapid assembly of hydrant mains, refinery process lines, and desalination plant distribution under high-pressure conditions.
Service Life
Internal Lining
ISO 4179 specifies centrifugally applied cement–mortar lining that maintains hydraulic performance (Hazen–Williams > 130) and prevents internal corrosion for over a century.
External Coating
Bitumen or fusion-bonded epoxy over a zinc primer (ISO 8179) shields the pipe body from soil corrosion. In sulfate-rich or aggressive soils, BioZinalium® (zinc–aluminium alloy) extends life to 110 years under ISO testing.
Material Durability
Ductile iron grade GGG50 ensures tensile strength ≥ 420 MPa and elongation ≥ 7 % for DN 1000–DN 1200, resisting surge pressures plus external loads over decades.
Installation & Connection
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Push-On “Tyton” Joints: Per ANSI/AWWA C111, a single EPDM gasket allows ±5° deflection and NSF-61 compliance for potable water lines, enabling rapid, hot-work-free assembly.
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Mechanical Joints: Also under AWWA C111, these permit 360° rotation and axial movement, ideal for tight curves and differential settlement conditions.
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Bolt-On Flanged Joints: ANSI/AWWA C115 or EN 1092-2 flanges rated PN 16–40 use stainless or carbon-steel bolts and nuts, ensuring precise alignment for valve and skid installations.
International Standards
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ISO 2531 / EN 545 / EN 598: Wall thickness formula, mechanical tests, pressure classes, raw materials.
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AWWA C151/A21.51 & C153/A21.53: Centrifugally cast DI pipe & compact fittings for potable and reclaimed water.
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AWWA C111/A21.11 & C115/A21.15: Specifications for push-on, mechanical, and flanged joints.
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ANSI B16.1 & BS EN 1092-2: Flange dimensions and ratings for PN 10–40 service.
Price Comparison
Piping cost per ton typically rises with wall thickness. Approximate market ranges:
| Class | Wall Thickness (mm) | Price (USD/ton) |
|---|---|---|
| K7 | 9.8 | 400–460 |
| K8 | 11.2 | 450–500 |
| K9 | 12.6 | 449–530 |
| K12 | 18.0 | 482–526 |
Advantages
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High Strength & Ductility: GGG50 grade yields ≥ 420 MPa tensile and ≥ 7 % elongation, resisting dynamic loads and ground movement.
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Corrosion Resistance: Multi-layer external coatings plus cement lining virtually eliminate tuberculation and external corrosion.
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Hydraulic Efficiency: Large internal diameter and smooth lining minimize head loss, reducing long-term pumping costs.
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Ease of Maintenance: Reusable joints and no hot-work on site speed repairs; modular fittings lower downtime.
Frequently Asked Questions
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What is the nominal wall thickness of Class K12 DN1000?
18 mm (ISO 2531 formula: e = 12×(0.5+0.001×1000)). -
Which pressure classes are available?
PN 16 (EN 545/AWWA C151) up to PN 25–40 for flanged systems (AWWA C115/EN 1092-2). -
What is the expected service life?
100 years in normal soils; up to 110 years in aggressive environments with BioZinalium® coating.
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What joint options are offered?
Tyton push-on (ANSI/AWWA C111), mechanical (C111), and bolt-on flanged (C115/EN 1092-2) joints. -
Which international standards apply?
ISO 2531, EN 545, EN 598, AWWA C151/C153, AWWA C111/C115, ANSI B16.1, EN 1092-2.
Case Studies
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Municipal Trunk Main Upgrade (DIPRA): U.S. utilities replaced 800–1200 mm PVC mains with K12 DN1000 ductile iron, reducing leaks by 85% and extending interval between renewals by 30 years.
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Water Main Break Analysis (Materials Performance): A 36-in (≈ 914 mm) cast iron failure led to flooding; subsequent replacement with DN1000 ductile iron K12 showed zero leaks over a 10-year monitoring period.
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Soft Soil Irrigation (ResearchGate): In subsiding agricultural land, DN1000 ductile iron with cement–mortar lining maintained full hydraulic capacity and structural integrity under 5 m of settlement.
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 | ….. |
