Ductile Iron Water Pipe Specifications: Dimensions, Standards

Time:2025-05-21

Ductile iron pipes are manufactured following stringent standards to ensure quality and performance. The primary standards include:

  • ANSI/AWWA C151/A21.51: Covers the manufacturing of ductile iron pipes, specifying dimensions, tolerances, and mechanical properties.

  • ANSI/AWWA C150/A21.50: Provides guidelines for the thickness design of ductile iron pipes, considering internal pressure and external loads.

  • ANSI/AWWA C104/A21.4: Specifies the cement-mortar lining for ductile iron pipes to prevent corrosion and enhance flow.

  • ANSI/AWWA C105/A21.5: Details the use of polyethylene encasement for corrosion protection.

  • ISO 2531: International standard for ductile iron pipes, fittings, accessories, and their joints for water applications.

Ductile Iron Water Pipe Specifications
Ductile Iron Water Pipe Specifications

ductile iron pipe dimensions

Ductile iron pipes come in various sizes and pressure classes to suit different applications.

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 …..

Joint Types and Sealing Mechanisms

Ductile iron pipes utilize various joint types to ensure leak-free connections:

  • Push-On Joints: Feature a rubber gasket compressed between the spigot and bell, allowing for easy assembly without special tools.

  • Mechanical Joints: Use a gasket, gland, and bolts to secure the connection, suitable for installations requiring disassembly.

  • Flanged Joints: Involve bolting two flanged ends together with a gasket in between, commonly used in above-ground installations.

  • Restrained Joints: Designed to prevent joint separation due to thrust forces, often used in areas with high-pressure or dynamic loads.

Corrosion Protection Methods

Despite their inherent corrosion resistance, additional protective measures are employed:

  • Cement-Mortar Lining: Applied to the interior surface to prevent corrosion and improve hydraulic performance.

  • Polyethylene Encasement: A loose-fitting sleeve that protects the exterior from aggressive soils.

  • Zinc Coating: Provides sacrificial protection, often used in conjunction with polyethylene encasement.

  • Cathodic Protection: Involves applying an electrical current to counteract corrosive reactions, typically used in highly corrosive environments.

Installation Guidelines

Proper installation is crucial for the longevity and performance of ductile iron pipes:

  • Trenching: Ensure trenches are wide enough to accommodate the pipe and allow for proper bedding and backfill.

  • Bedding: Use suitable materials like sand or gravel to provide uniform support along the pipe’s length.

  • Backfilling: Compact backfill material in layers to prevent settlement and protect the pipe.

  • Alignment: Maintain straight alignment to prevent undue stress on joints.

  • Testing: Conduct hydrostatic pressure tests to verify the integrity of the installed pipeline.

Advantages of Ductile Iron Pipes

Ductile iron pipes offer several benefits over alternative materials:

  • Strength: High tensile and yield strength make them suitable for high-pressure applications.

  • Durability: Resistant to impact, vibration, and external loads.

  • Longevity: With proper installation and maintenance, they can last over 100 years.

  • Hydraulic Efficiency: Smooth interior surfaces reduce friction, enhancing flow capacity.

  • Versatility: Available in various sizes and configurations to meet diverse project requirements.

Frequently Asked Questions (FAQs)

Q1: What is the lifespan of ductile iron pipes?

Ductile iron pipes are known for their exceptional durability. With proper installation and maintenance, they can last over 100 years. Factors influencing their lifespan include soil conditions, corrosive environments, and the effectiveness of protective measures like cement-mortar lining and polyethylene encasement. Regular inspections and adherence to best practices further enhance their longevity.

Q2: How do ductile iron pipes compare to PVC pipes?

While both materials are used in water distribution, ductile iron pipes offer higher strength and impact resistance, making them suitable for high-pressure applications and areas with heavy traffic loads. PVC pipes are lighter and easier to handle but may not withstand the same external loads. Additionally, ductile iron pipes have a longer proven service life and better fire resistance.

Q3: What are the common causes of corrosion in ductile iron pipes?

Corrosion can result from aggressive soils, stray electrical currents, and exposure to certain chemicals. To mitigate these risks, protective measures like cement-mortar lining, polyethylene encasement, and cathodic protection are employed. Regular soil testing and adherence to standards like ANSI/AWWA C105/A21.5 help in assessing and addressing corrosion risks.

Q4: Can ductile iron pipes be used for wastewater applications?

Yes, ductile iron pipes are suitable for wastewater systems. Their strength and corrosion resistance make them ideal for transporting sewage and industrial effluents. Proper linings and coatings further enhance their performance in such applications.

Q5: How is the pressure class of a ductile iron pipe determined?

The pressure class indicates the pipe’s ability to withstand internal pressure. It’s determined based on factors like wall thickness, diameter, and material strength. Standards like ANSI/AWWA C150/A21.50 provide guidelines for calculating the appropriate pressure class for specific applications.

Q6: What maintenance practices are recommended for ductile iron pipelines?

Regular inspections to detect leaks, corrosion, or joint issues are essential. Cleaning the interior surfaces to prevent buildup and ensuring protective coatings remain intact also contribute to the pipeline’s longevity. Implementing a proactive maintenance schedule helps in early detection and resolution of potential issues.

Q7: Are there environmental considerations when using ductile iron pipes?

Ductile iron pipes are environmentally friendly due to their recyclability and long service life, reducing the need for frequent replacements. Their durability minimizes the risk of leaks, conserving water resources. Additionally, the manufacturing processes have evolved to be more sustainable, further reducing their environmental impact.

References:

Statement: This article was published after being reviewed by Luokaiwei technical expert Jason.

Global Solutions Director

Jason

Global Solutions Director | LuoKaiWei

Jason is a seasoned expert in ductile iron technology, specializing in the development, application, and global promotion of ductile iron pipe systems. Born on August 13, 1981, he earned his Bachelor of Science in Materials Science and Engineering with a minor in Mechanical Engineering from the University of Nevada, Reno.

Since joining Luokaiwei in 2015, a leading manufacturer of ductile iron pipes and fittings, Jason has played a pivotal role in advancing the company’s product line and expanding its global reach. His responsibilities encompass research and development, technical sales, and providing expert consultation on the selection and installation of ductile iron pipelines. Leveraging his deep understanding of materials science, Jason offers tailored solutions to clients worldwide, ensuring optimal performance and longevity of infrastructure projects.

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