Class 150 ductile iron pipe delivers a 150 psi working pressure rating (plus 100 psi surge allowance) per ANSI/AWWA C150/A21.50-91, and its cement-mortar lining combined with polyethylene encasement supports an expected service life > 100 years in normal soils. Its push-on, mechanical, restrained and flanged joint systems simplify trench-side work while ensuring leak-tight performance. Fully compliant with AWWA C150/C151, C104/C105, C110/C111 and international ISO 2531, EN 545, EN 598 standards, this class offers a versatile, sustainable and cost-effective piping solution for water, wastewater, irrigation and industrial networks.
Application Scenarios
Class 150 DI pipe suits a broad spectrum of projects:
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Municipal water mains in low- to medium-pressure zones, where 150 psi service is sufficient for distribution loops and rural systems.
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Gravity and force sewer mains, relying on cement-mortar lining to prevent tuberculation and control flow in wastewater applications.
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Agricultural irrigation networks, benefiting from the pipe’s smooth lining (Hazen–Williams C≈140) to reduce pump energy usage versus PVC alternatives.
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Industrial process and plant piping, where flanged Class 150 fittings connect to pumps and valves under moderate pressures.
Service Life
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> 100 years under normal burial conditions using cement-mortar lining and polyethylene sleeving.
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Utilities report continuous service of DI mains exceeding a century with minimal rehabilitation.
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Life-cycle cost analyses demonstrate DI’s superior total-cost performance over 100 years compared with PVC and alternative materials.
Installation and Connection
Push-On & Mechanical Joints
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Push-on joints feature a single rubber gasket in the bell, allowing rapid, field-friendly assembly without bolting.
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Mechanical (MJ) joints use gland-and-bolts plus elastomeric gaskets; ideal where restrained-joint performance is required without thrust blocks.
Restrained & Flanged Systems
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Restrained joints (e.g., Field-Lok®) lock spigot and bell under pressure surges, preventing separation in horizontal or vertical runs.
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Flanged ends bolt directly to pumps, valves or equipment via Flex-Ring® gaskets, ensuring rigid, leak-free connections.
Corrosion Protection
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Internal lining: Cement-mortar per ANSI/AWWA C104 provides a durable barrier against tuberculation.
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External coatings: Options include bonded zinc, asphaltic enamel or water-borne epoxy per ANSI/AWWA C105.
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Polyethylene sleeving: Loose encasement shields against stray currents and aggressive soils.
International Standards
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ANSI/AWWA C150/A21.50 – Pressure-class thickness design.
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ANSI/AWWA C151/A21.51 – Centrifugal-cast DI pipe dimensions and tolerances.
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ANSI/AWWA C104/C105 – Cement-mortar lining and polyethylene encasement specifications.
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ANSI/AWWA C110/C111 – Mechanical and push-on joint performance.
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ISO 2531:2012, EN 545, EN 598 – Metric pipe and fitting standards for water applications.
Comparative Parameters (Classes 52, 53, 150, 350)
| Class | Standard | Rated Pressure | Surge Allowance | Joint Types | Diameters Available |
|---|---|---|---|---|---|
| 150 | ANSI/AWWA C150/A21.50-91 | 150 psi | 100 psi | Push-on, MJ, restrained, flanged | 3″–64″ |
| 52 | ANSI/AWWA C110/A21.10 | 200 psi | 100 psi | Mechanical-joint only | 4″–12″ |
| 53 | ANSI/AWWA C110/A21.10 | 250 psi | 100 psi | Mechanical-joint only | 4″–12″ |
| 350 | ANSI/AWWA C150/A21.50-91 | 350 psi | 100 psi | Push-on, MJ, restrained, flanged | 3″–64″ |
Advantages
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Exceptional Durability: Proven > 100 year lifespan minimizes replacements.
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High Strength: Meets AWWA tensile/impact requirements for trench loads and surges.
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Corrosion Resistance: Cement-mortar and encasement virtually eliminate decay.
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Installation Flexibility: Multiple joint systems adapt to site constraints.
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Sustainability: Up to 60 % recycled iron content; fully recyclable at end-of-life.
Frequently Asked Questions
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What does “Class 150” signify?
A working pressure rating of 150 psi plus 100 psi surge allowance, per ANSI/AWWA C150. -
How long will Class 150 pipe last?
With proper lining and encasement, service lives exceed 100 years. -
Which joint types are available?
Push-on, mechanical, restrained and flanged joints per AWWA C110/C111. -
How is corrosion controlled?
Cement-mortar lining plus polyethylene sleeving or epoxy coatings per AWWA C104/C105. -
What sizes are offered?
Nominal diameters from 3″ to 64″ per ANSI/AWWA C151.
Case Studies
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Huntsville, AL Water Utility: A Black & Veatch analysis showed a 3 % annual O&M saving by using DI mains over 50 years, representing > $17 million present value.
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University of Michigan LCCA: A 1 000 ft, 8″ DI main demonstrated lower total cost of ownership versus PVC across a 100-year horizon.
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 | ….. |
