Class K12 DN700 ductile iron pipe boasts a nominal wall thickness of 14.4 mm, calculated by ISO 2531’s formula e = K × (0.5 + 0.001 × DN) (K = 12, DN = 700). This pipe is rated for medium- to high-pressure applications (PN 12.5–PN 16) and offers a design service life exceeding 100 years—even in aggressive soils, reaching up to 110 years under ISO 2531 conditions.
Application Scenarios
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Potable Water Distribution: Ideal for municipal networks thanks to its large inside diameter (≈ 671.2 mm) and cement–mortar lining for water purity.
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Sewage & Wastewater: Resistant to abrasion and ground movements, ensuring long‐term reliability in sewer mains.
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Irrigation Networks: Handles variable flow rates and pressures; used in large agricultural projects (e.g., Saint-Gobain PAM IRRIGAL range for 100–1000 mm DI pipes).
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Fire Protection & Industrial: Compatible with FM/UL grooved systems and ANSI B16.1 flanges for rapid, leak-free connections in critical fire-hydrant mains.
Service Life
Thanks to ductile iron’s inherent corrosion resistance (epoxy or bitumen external coatings, zinc primers, plus cement–mortar lining internally), K12 pipes easily exceed a 100-year lifespan under standard conditions. Even in aggressive soils, tests show up to 110 years of reliable service before significant degradation.
Laying & Connection
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Joint Types:
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Push-On “Tyton” per AWWA C111 for fast, flexible connections.
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Mechanical Joints under ANSI B16.1 for 360° rotation and angular deflection.
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Bolt-On Flanged Joints (16 bar rating) conforming to ISO 2531 flange class, ideal for precise alignments.
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Installation: No hot works on site; gasketed systems allow rapid assembly and minimal excavation time, reducing labor costs and traffic disruption.
International Standards
Manufactured and tested to the following key standards:
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ISO 2531 / EN 545 / EN 598: Wall thickness, raw material, mechanical tests (elongation ≥ 7% for K ≥ 12).
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AWWA C151/A21.51 & C153/A21.53: Centrifugal cast pipe and fittings, with Charpy impact testing.
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BS EN 545 / BS 4772: Socketed and flanged fittings specifications.
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ISO 4179 & 8179: Internal cement–mortar lining and external coatings requirements.
Price Comparison with Other Thickness Classes
This table and chart compare wall thickness vs. average price across popular K-series classes (prices per ton):
| Class | Wall Thickness (mm) | Avg Price (USD/ton) |
|---|---|---|
| K7 | 8.4 | 460–590 |
| K8 | 9.6 | 490–500 |
| K9 | 10.8 | 509–540 |
| K12 | 14.4 | 435–500 |
Below is a visual plot of average price vs. wall thickness:
Price Comparison for Ductile Iron Pipe Classes (table and scatter chart displayed via Python)
Advantages
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High Tensile & Impact Strength: Up to 420 MPa tensile with ≥ 5% elongation.
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Flexibility: Accommodates ground movements without cracking, unlike gray cast iron.
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Corrosion Resistance: Multi-layer coatings (zinc + epoxy/bitumen) extend service life.
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Ease of Maintenance: Uniform surface finish prevents biofilm and scale buildup.
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Hydraulic Efficiency: Large I.D. reduces pumping costs and energy consumption.
Frequently Asked Questions (FAQ)
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What is the nominal wall thickness of Class K12 DN700?
14.4 mm, per ISO 2531’s formula e = 12 × (0.5 + 0.001 × 700). -
What pressure rating does K12 DN700 support?
PN 12.5 (1.25 MPa) up to PN 16 with flanges (1.6 MPa) for water and sewage networks. -
How long is the service life?
Typically > 100 years; up to 110 years in aggressive soils under ISO tests. -
Which joint types are available?
Push-on Tyton, AWWA C111 mechanical, and flange per ANSI B16.1/ISO 2531 flange class. -
What standards govern K12 DN700 manufacturing?
ISO 2531/EN 545, AWWA C151/A21.51, BS EN 545 & ISO 4179/8179 linings and coatings.
Case Studies
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Urban Renewal Water Project: A municipality replaced antiquated mains with DN700 K12 pipes, achieving stable pressures and a 25% increase in daily flow capacity.
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DIPRA Utility Upgrades: Multiple cities leveraged K12 for trenchless rehabilitation, reducing downtime by 40% and extending network life.
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Saint-Gobain PAM Aqueducts: CLASSIC DN700–DN2000 pipes used in mountainous terrains demonstrated zero leak rates 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 | ….. |
