More than a century ago, way back in the heydays of cast iron pipe, which some still refer to as grey iron pipe, there were as few as four wall classes available (A, B, C, and D). DI pipe entered the marketplace in the mid-60s ushering in a new wave of technological advancements and manufacturing possibilities, and by the mid-70s there were seven wall classes available (0 through 6). These DI pipe classes were quickly renamed class 50 through 56, given that a &#;0 wall pipe&#; does not sound as strong as it truly was.
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Come , with increased competition from alternate pipe materials as well as customer demand for a thinner wall DI pipe, the class selection grew to twelve, with Pressure Classes 150, 200, 250, 300, and 350 introduced in various diameters. Each of these pipe walls, Thickness Class and/or Pressure Class for modern DI pipe, are included in and governed by AWWA standards.
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