Class K12 DN150 ductile iron pipe delivers robust performance with a 150 mm nominal diameter and a 12 bar working pressure, tailored for demanding water, wastewater, fire protection, and industrial applications. Its cement-mortar internal lining and fusion-bonded epoxy or bitumen external coatings ensure superior corrosion resistance and hydraulic capacity over decades. Independent studies by DIPRA confirm an anticipated service life exceeding 100 years, significantly outlasting alternatives such as PVC or HDPE. Installation is streamlined via push-on, mechanical, or self-restraining joints, accommodating trench and trenchless methods while maintaining leak-tight integrity. Full compliance with ISO 2531, EN 545, and EN 598 guarantees global compatibility and easy procurement.
Application Scenarios
Municipal and industrial users choose DN150 K12 pipes for:
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Potable Water Distribution: Smooth lining resists biofilm and scaling, ensuring safe supply to residential and commercial zones.
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Wastewater & Sewer Force Mains: High strength and abrasion resistance reduce sediment buildup and extend maintenance intervals.
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Fire Protection Networks: 12 bar rating delivers rapid, high-flow performance for hydrants and sprinkler systems.
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Industrial Process Lines: Durable under variable temperatures and pressures for cooling, process water, and effluent handling.
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Trenchless & Subaqueous Installations: Coatings and ductility protect against soil movement, stray currents, and underwater corrosion.
Service Life
Long-term value stems from:
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Century-plus Longevity: Utilities in the Cast Iron Pipe Century Club attest to 100–125 years of reliable service.
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Lifecycle Cost Savings: A 2012 Black & Veatch analysis projects millions in net present value savings over alternative materials, driven by reduced energy and maintenance costs.
Installation & Jointing
Push-On Joints
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EPDM-gasketed bell-and-spigot assemblies enable rapid, tool-light connections in tight workspaces.
Mechanical (Flanged) Joints
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Bolted couplings provide axial restraint and elevated pressure capabilities (up to PN25), ideal for high-pressure zones and easy disassembly.
Self-Restrained Joints
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Integral locking lugs in the bell eliminate external thrust blocks, reducing excavation and installation time on directional changes.
Polyethylene encasement (Method A) wraps each barrel and joint, blocking stray currents and corrosive agents.
International Standards
Class K12 DN150 pipes meet or exceed:
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ISO 2531:2015 – Dimensions, testing, linings for water pipelines.
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EN 545:2010 – Pipes and fittings for water supply.
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EN 598:2007 – Sewerage pipes and fittings, including force mains.
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ASTM A 536 / A 21.51 – Ductile iron material and pressure-class specifications.
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GB 13295-2019 – Chinese national standard for ductile iron pipes and coatings.
Price Comparison with Other Series
| Series / Class | DN 150 Price (USD/m) | Source |
|---|---|---|
| Class K9 | 300 – 400 | Alibaba – seamless DI pipe RN150 |
| Class K12 | 325 – 450 | Made-in-China – ductile cast iron DN150 |
| PN10 (C25) | 280 – 350 | ISO 2531 listing (C25 series) |
| PN16 (C30) | 360 – 480 | ISO 2531 listing (C30 series) |
Prices vary by coating, joint type, volume, and region; consult local suppliers for exact quotations.
Key Advantages
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Durability: Over 100 years of proven service minimizes replacements and service interruptions.
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High Pressure Capacity: 12 bar rating covers fire mains and industrial demands without upsizing.
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Corrosion Protection: Cement-mortar lining plus epoxy/bitumen coatings guard internal and external surfaces.
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Installation Flexibility: Multiple jointing methods and encasement options suit trench, trenchless, and seismic projects.
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Sustainability: High recycled content and full recyclability support environmental and circular-economy goals.
Frequently Asked Questions
Q1: What does “DN150” mean?
A: “DN150” refers to a nominal internal diameter of 150 mm, as defined by ISO 3 standards.
Q2: Why choose Class K12 over K9?
A: K12 offers a higher working pressure (12 bar vs. 9 bar) and thicker walls for more demanding applications.
Q3: Are these pipes suitable for trenchless installation?
A: Yes—ductile iron’s flexibility, weight, and self-restraining joints make DN150 K12 ideal for HDD and microtunneling.
Q4: How is leak tightness maintained?
A: EPDM gaskets in push-on joints, gland plates in mechanical joints, and integrated restraints in self-restrained joints ensure leak-proof connections.
Case Studies
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California Utility Upgrade: A major California water district replaced aging mains with Class K12 DN150, achieving a 70% reduction in break rates and saving $5 million in maintenance over 15 years.
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Energy Savings Analysis: A Black & Veatch report highlights $17 million present-value savings over 50 years for ductile iron mains versus HDPE, driven by lower energy and repair costs.
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European Renewal Project: Multiple European municipalities switched to DN150 K12 pipes, reporting zero failures and improved hydraulic performance after 20 years in service.
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 | ….. |
