A carefully engineered solution for water and wastewater systems, the 20 inch cement-lined ductile iron pipe excels in potable water transmission, sewage and industrial applications, and stormwater management by combining robust mechanical strength with a protective cement mortar lining that maintains hydraulic efficiency (Hazen-Williams C≈140) and resists internal corrosion for over a century of service. Backed by ANSI/AWWA C104/A21.4 and ISO 2531 compliance, it offers versatile jointing (push-on, mechanical, flanged) per AWWA C111/A21.11, ensuring leak-tight connections and rapid field assembly.
Application Scenarios
Ductile iron pipes are the backbone of municipal potable water networks, delivering clean water under consistent pressure with minimal friction head loss. They’re equally suited for non-aggressive wastewater and sewage force mains, providing structural integrity in gravity and pressurized systems. In industrial settings—chemical plants, pulp and paper mills, and desalination facilities—the cement lining protects against mild chemical attack and maintains water quality.
Service Life
Cement mortar linings create a high-pH barrier that virtually eliminates tuberculation, yielding an estimated service life exceeding 100 years under typical water chemistry. Field studies confirm that lined ductile iron mains retain Hazen-Williams coefficients between 130 and 151 even after decades in service, preserving hydraulic capacity and reducing energy costs.
Installation and Connection
– Push-On Joints: Rubber-gasketed, allowing simple push-on assembly for pipe Ø 3 in. to 64 in., delivering reliable seals against infiltration, exfiltration, and root intrusion.
– Mechanical Joints: Engineered per ANSI/AWWA C110/A21.10 for sizes 3 in.–48 in., with glands, gaskets, and bolts for secure connections in tight spaces.
– Flanged Joints: Compliant with ANSI/AWWA C115/A21.15, ideal for special fittings and above-ground assemblies where bolted flanges facilitate maintenance.
International Standards
Certified to industry benchmarks, this pipe meets:
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ANSI/AWWA C104/A21.4: Cement-mortar lining for water services.
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ANSI/AWWA C105/A21.5: Polyethylene encasement for external corrosion protection.
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ANSI/AWWA C150/A21.50 & C151/A21.51: Thickness design and centrifugal casting requirements.
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ISO 2531: Global standard for ductile iron pipes, fittings, and joints for water applications.
Size Comparison: 4″, 6″, 8″, 10″ Pipes
| Nominal Size | Outside Diameter | Wall Thickness (Class 52) | Approx. ID | Hazen-Williams C |
|---|---|---|---|---|
| 4 in. | 4.80 in. | 0.32 in. | 4.16 in. | 140 |
| 6 in. | 6.90 in. | 0.31 in. | 6.28 in. | 140 |
| 8 in. | 9.05 in. | 0.33 in. | 8.39 in. | 140 |
| 10 in. | 11.10 in. | 0.35 in. | 10.40 in. | 140 |
| Data per ANSI/AWWA C150 dimensions and DIPRA flow coefficient. |
Advantages
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Exceptional Durability: Over 100 years lifespan minimizes lifecycle costs.
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High Hydraulic Efficiency: Low friction lining sustains C≈140, reducing pump energy use.
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Corrosion Resistance: Cement mortar prevents tuberculation and metal leaching.
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Leak-Tight Joints: Push-on and mechanical joints ensure system integrity and rapid installation.
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Sustainability: Ductile iron is 100% recyclable and recognized as a green material by sustainable building programs.
Frequently Asked Questions
Q1: What is cement-lined ductile iron pipe?
A: It’s ductile cast iron pipe centrifugally lined with cement mortar (1:2–1:3.5 sand:cement), providing internal corrosion protection and smooth flow.
Q2: What pressure ratings are available?
A: Standard pressure classes range from 150 psi to 350 psi (Class 51–56), selectable per AWWA C150 design.
Q3: Are joints required to be restrained?
A: Restrained push-on variants and mechanical restraints per ANSI/AWWA C111 options eliminate thrust blocks for compact installations.
Q4: Can these pipes handle wastewater?
A: Yes—suitable for non-aggressive wastewater under AWWA C111 guidelines, with specialized linings where needed.
Case Studies
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Charleston, SC (1922–2022): First U.S. cement-lined cast iron main served 100 years before routine upgrade, confirming long-term flow retention and minimal head loss.
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San Lorenzo Valley, CA: Municipal water district replaced aging transite with 20 in. ductile iron, improving system reliability and reducing leak incidents.
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Berlin Water Supply, Germany (2016): 15 km of DN 600 K9 ductile iron pipes maintained hydraulic efficiency and corrosion resistance in a major urban supply project.
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 | ….. |
