Material Ductile Iron Pipe

Image provided by Ferris State University


Ductile iron pipe is made from cast iron that has been treated while molten to increase its relative malleability, making it less brittle and more resistant to fracture than traditional cast iron. This high-strength material is available in a variety of sizes, pressure classification, and wall thicknesses that can be installed with a several types of mechanical joints.

Diameters range from 3- to 64-inch and pipe is available in lengths of 18- or 20-foot.

Standard Pressure Classes include 150-, 200-, 250-, 300-, and 350-psi. 

Special Thickness Classes include 50, 51, 52, 53, 54, 55, and 56. Actual wall thickness for each class is found in manufacturer’s tables.

Introduced in 1955, ductile iron pipe has become the standard for underground water and sewer systems, with proven reliability and durability for raw and potable water, sewer, slurries, and process chemicals. It is typically supplied with a cement-mortar lining, and other optional linings are available for numerous applications.

The mechanical properties of ductile iron pipe must conform to ANSI/AWWA C151/A21.51*. This pipe has a minimum tensile strength of 60,000 psi and displays many desirable characteristics. It will bend considerably before failing and can withstand severe crushing loads. It is highly impact and corrosion resistant and exhibits tremendous bursting strength.

*American National Standards Institute/American Water Works Association



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