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 wall thicknesses that can be installed with a variety of mechanical joints. Typically supplied with cement lining with or without a sealer, ductile iron pressure pipe is usually found in buried water service or sewer piping (mains to building service connections).

Ductile Iron Pipe is available in diameter ranging from 3” to 54” in 20’ lengths. Pipe is available in various wall thicknesses known as “weights” to accommodate various pressures: the thicker the wall, the higher the pressure rating of the pipe.  The American National Standards Institute (ANSI) has developed a standard system that designates pipe weights using “schedule numbers” ranging from Schedule 10 (S.10) through Schedule 160 (S.160). Higher schedule numbers designate greater pipe wall thickness and correspond to higher allowable working pressure.  An older system is also sometimes used to designate pipe weight. In this system standard (STD) is equal to Schedule 40 and extra strong (XS), sometimes known as extra heavy (XH), is equal to Schedule 80. Pipe with walls twice as thick as extra strong is known as double extra strong (XXS) or double extra heavy (XXH).


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