AMERICAN NATIONAL STANDARD: WELDED AND SEAMLESS WROUGHT STEEL PIPE.

This Standard covers the standardization of dimensions of welded and seamless wrought steel pipe, for high or low temperatures and pressures. The word pipe is used as distinguished from tube to apply to tubular products of dimensions commonly used for pipeline and piping systems. Pipe dimensions of sizes 12 inch and smaller have outside diameters numerically larger than corresponding size. In contrast, the outside diameters of tubes are numerically identical to the size number for all sizes.