How is pipe thickness typically measured?

The thickness of a pipe is most accurately defined by the schedule of the pipe. The "schedule" refers to a standard that indicates the wall thickness of the pipe relative to its diameter. Different schedules correspond to different thicknesses for the same nominal pipe diameter. For example, Schedule 40 and Schedule 80 pipes of the same nominal size will have different wall thicknesses, with Schedule 80 being thicker. This method of measurement is particularly important in construction and engineering applications where pressure ratings and structural integrity are critical, as thicker walls can withstand higher pressures.

Measuring by diameter, weight, or length does not provide a reliable indication of wall thickness. While the diameter may influence the nominal size, it does not account for wall thickness variations across schedules. Weight is more dependent on both thickness and material, making it an impractical measure for specifically identifying wall thickness alone. Lastly, length measures the pipe's extent but does not consider how thick the walls are, which is vital for determining performance under load or pressure. Thus, focusing on the schedule provides the clearest understanding of a pipe's wall thickness.