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Ductile iron pipes are widely used in water transmission, wastewater systems, and industrial infrastructure due to their strength, durability, and long service life. This comprehensive guide explains ductile iron pipe dimensions, including nominal diameters (DN), wall thickness, pressure classes, pipe lengths, and international standards such as ISO 2531, EN 545, and AWWA C151. Whether you are an engineer, contractor, consultant, or procurement professional, this article provides valuable insights to help select the right ductile iron pipe size and specification for your project requirements.