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      Ductile Iron Pipe Specifications

      The American Water Works Association (AWWA) has established standard ductile iron pipe dimensions for the United States. Pipe size, also known as Nominal Diameter, is approximately equivalent to the pipe’s internal diameter measured in inches (internal diameter may vary) .  The exterior diameter dimensions are what is kept consistent to maintain compatibility in joints and fittings. Pipe sizes range from 3” up to 64” or more for custom large diameter pipes. 

      Nominal Pipe Size (Inches)Nominal Pipe Size (mm)Outside Diameter (Inches)Outside Diameter (mm)ClassWall Thickness (Inches)Weight of Pipe (lb/ft)Weight of Pipe & Water (lb/ft)
      3″80.003.96100.6053.000.3111.2015.00
      4″100.004.80121.9053.000.3214.2020.10
      6″150.006.90175.3053.000.3422.0035.10
      8″200.009.05229.9053.000.3631.0054.00
      10″250.0011.10281.9053.000.3840.4076.80
      12″300.0013.20335.2053.000.4050.70103.00
      14″350.0015.30388.6053.000.4262.40133.50
      16″400.0017.40442.0053.000.4372.80165.90
      18″450.0019.50495.3053.000.4483.60201.50
      20″500.0021.60548.6053.000.4595.20241.00
      24″600.0025.80655.3053.000.47119.20329.40
      30″750.0032.00812.8053.000.51161.30487.80
      36″900.0038.30972.8053.000.58219.50688.80
      42″1050.0044.501130.3053.000.65285.20920.10
      48″1200.0050.801290.3053.000.72360.301189.20
      54″1350.0057.101450.3053.000.81455.001502.20
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