The 12 inch (nominal) ductile iron pipe features a 335.28 mm outside diameter, exceptional durability, and versatile jointing options, making it ideal for potable water, wastewater, and industrial applications. Conforming to AWWA C151, ISO 2531, and EN 545, these pipes boast a service life exceeding 100 years, low life-cycle costs, and high resistance to internal pressure and external loads. A comparative table of OD values for 4″, 6″, 8″, 10″, and 12″ sizes is included to guide specification.
Application Scenarios
Ductile iron pipes are predominantly used in:
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Potable Water Transmission & Distribution: Ensures safe, corrosion-protected pipelines for municipal water systems.
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Wastewater & Sewage: Handles high flow rates and aggressive media when lined appropriately.
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Irrigation & Industrial: Supports chemical plants, fire-protection mains, and reclaimed water networks owing to rugged construction.
Service Life
Modern ductile iron pipe systems are designed to exceed 100 years of service under normal conditions:
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According to the Ductile Iron Pipe Research Association, pipes have a projected life of 100+ years due to superior metallurgical properties and recycled content.
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With standard cement-mortar lining and external coatings, internal corrosion is virtually eliminated, supporting century-long performance.
Advantages
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High Strength & Pressure Rating: Nodular graphite microstructure offers twice the strength of gray iron, supporting classes up to 350 psi or higher.
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Corrosion Protection: Cement-mortar lining, zinc and asphalt coatings, and polyethylene sleeving guard against soil and water corrosion.
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Life-Cycle Cost Efficiency: Over a 100 year lifespan, ductile iron pipe incurs lower total costs compared to plastic alternatives.
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Seismic & Ground Movement Resistance: Flexible joints and restrained systems accommodate shifting soils and seismic events.
International Standards
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ANSI/AWWA C151/A21.51: Governs dimensions and pressure classes from 3″ to 64″ for potable, raw, and reclaimed water systems.
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ISO 2531 / EN 545 / EN 598: Defines requirements for pipes, fittings, accessories, and joints for water and sewer applications.
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Regional Standards: KSD 4311 (Korea), AS 2280 (Australia), GB/T 13295 (China) ensure local compliance and interoperability.
OD Comparison for 4″, 6″, 8″, 10″, and 12″ Pipes
| Nominal Size | Outside Diameter (in) | Outside Diameter (mm) |
|---|---|---|
| 4 inch | 4.80 | 121.92 |
| 6 inch | 6.90 | 175.26 |
| 8 inch | 9.05 | 229.87 |
| 10 inch | 11.10 | 281.94 |
| 12 inch | 13.20 | 335.28 |
Data per BS EN 545 / AWWA C151: nominal ODs for cement-lined ductile iron pipes.
Installation and Jointing
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Push-On (Tyton) Joints: Quick assembly, accommodates deflection, ideal for curved alignments.
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Mechanical Joints: Bolted gland for positive restraint in high-pressure or seismic zones.
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Flanged Ends: Used where bolted connections to valves or pumps are required; standard to BS EN 1092-2 PN16.
FAQs
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What is the maximum pressure rating?
Pressure classes range from 150 psi (Class K4) up to 350 psi (Class K12) per AWWA C151. -
Can these pipes be sleeved for corrosion?
Yes—polyethylene encasement per ANSI/AWWA C105 prevents soil-induced corrosion. -
What installation trench backfill is recommended?
Use granular, non-corrosive backfill materials; native soil may suffice if non-aggressive. -
How are fittings supplied?
Fittings (tees, bends, reducers) follow ISO 2531 / EN 545 dimensions, integrally socketed or flanged.
Case Studies
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Municipal Water Main Rehabilitation: A mid-sized U.S. city replaced 5 km of aging cast-iron mains with 12″ ductile iron, realizing a $17 million net present value savings over 50 years (Black & Veatch study) .
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Coastal Industrial Plant: Installed restrained mechanical joints and HDSS coated pipes to withstand saline drift and heavy machinery loads, achieving zero leaks over 15 years.
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 | ….. |
