The steel pipe data chart below can be used to find pipe sizes, diameters, wall thickness, working pressures and more. The chart is based on ASME/ANSI B 36.10 Welded and Seamless Wrought Steel Pipe and ASME/ANSI B36.19 Stainless Steel Pipe. Regardless of schedule number, pipes of a particular size all have the same outside diameter (not ...