Class K12 DN900 ductile iron pipe is engineered with a nominal wall thickness of 16.8 mm, calculated by the ISO 2531 formula e = K × (0.5 + 0.001 × DN) (K = 12, DN = 900). It is available in large‐diameter pressure ratings up to PN 40 for DN 900–1200, with cement–mortar lining and zinc/bitumen or epoxy coatings delivering a design life exceeding 100 years in normal soils and up to 110 years in aggressive environments. Installation offers versatile joints—Tyton® push-on, mechanical, and bolt-on flanged—ensuring flexibility and leak-tight performance under dynamic loads. Manufactured to ISO 2531, EN 545, EN 598, and AWWA C151/C111/C115 standards, K12 DN900 pipes provide robust hydraulic efficiency, corrosion resistance, and cost-effective life-cycle value compared with thinner classes.
Application Scenarios
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Potable Water Distribution
Large‐diameter mains (DN 900) minimize friction losses and maintain Hazen-Williams factors above 130 for decades, thanks to cement–mortar lining that resists tuberculation and biofilm formation. -
Sewage & Wastewater
Push-on and mechanical joints prevent infiltration/exfiltration and root intrusion, making them ideal for rising mains and gravity sewers under aggressive loads. -
Agricultural Irrigation
The IRRIGAL range (100–1000 mm) from Saint-Gobain PAM uses the same ductile iron strengths for fertilizer-rich soils, offering watertight, tool-free installation across irrigation networks. -
Fire Protection & Industrial
Compatible with FM/UL-certified grooved fittings and ANSI/AWWA C115 flanged ends, K12 DN900 pipes support PN 16–25 hydrant and sprinkler mains with rapid assembly and proven leak-free service.
Service Life
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Internal Lining: Centrifugally applied cement–mortar lining (ISO 4179) prevents tuberculation and sustains hydraulic performance for over a century.
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External Coating: Zinc primer plus bitumen or epoxy (ISO 8179) shields against soil corrosion; BioZinalium® options further extend lifespan in aggressive soils.
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Material Strength: Ductile iron (GGG50) guarantees ≥ 420 MPa tensile strength, resisting surge pressures and external loads for decades.
Installation & Connection
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Push-On (“Tyton®”) Joints: Single rubber gasket per ANSI/AWWA C111 provides ±5° deflection, rapid assembly under wet conditions, and NSF-61 compliance.
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Mechanical Joints: As per AWWA C111, these allow 360° rotation for precision alignment, ideal for curves and differential settlement.
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Flanged Joints: Bolt-on flanges per ANSI/AWWA C115 (or EN 1092-2) rated PN 16–40, supporting exact alignment for valve assemblies and prefabricated skids.
International Standards
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ISO 2531 / EN 545 / EN 598: Defines wall thickness (e = K×(0.5+0.001 DN)), raw materials, mechanical tests, and pressure classes.
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AWWA C151/A21.51 & C153/A21.53: Centrifugally cast ductile iron pipe and compact fittings for potable and reclaimed water.
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AWWA C111/A21.11 & C115/A21.15: Push-on, mechanical, and flanged joint specifications for leak-free performance.
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ANSI B16.1 & EN 1092-2: Flange dimensions and bolt patterns for PN 10–40 service.
Price Comparison
| Class | Wall Thickness (mm) | Price Range (USD/ton) |
|---|---|---|
| K7 | 9.8 | 400–460 |
| K8 | 11.2 | 450–500 |
| K9 | 12.6 | 449–530 |
| K12 | 16.8 | 482–526 |
Advantages
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High Strength & Ductility: GGG50 tensile ≥ 420 MPa with ≥ 7% elongation, offering resilience under surge and seismic loads.
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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 I.D. and smooth lining minimize energy loss, reducing pumping costs over the pipeline lifetime.
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Ease of Maintenance: Re-usable joints, no hot-works required on site, and modular fittings simplify repair and rehabilitation.
Frequently Asked Questions
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What is the nominal wall thickness of Class K12 DN900?
16.8 mm, per ISO 2531’s formula e = 12×(0.5 + 0.001×900). -
Which pressure ratings are available?
PN 25–40 for DN 900–1200 (EN 545/ISO 2531) and PN 16 per AWWA C115 for flanged lines. -
How long is the service life?
Over 100 years in normal soils; up to 110 years in aggressive soils with sulfate-resistant lining. -
What joint options exist?
Tyton® push-on (ANSI/AWWA C111), mechanical (C111), and bolt-on flanged joints (C115). -
Which standards govern manufacturing?
ISO 2531/EN 545/EN 598, AWWA C151/C153, C111/C115, ANSI B16.1, and EN 1092-2.
Case Studies
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Prescott, AZ Water Main Upgrade: In 2016, the city standardized on DN900 ductile iron, replacing PVC and achieving enhanced resilience under extreme temperatures.
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Pipe Flame Test (Birmingham, AL): Exposed DI pipe to 800 °C wildfire conditions, then pressurized to 500 psi with zero leakage, underscoring wildfire resilience.
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Saint-Gobain PAM DN 900 Range: Over a 20-year service in diverse soils, CLASSIC and INTEGRAL DN 900 pipes showed no sleeving requirement and zero leaks under PN 30–40 ratings.
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 | ….. |
