The first time we came across an ad for pipes with a schedule number, we wondered: prompt pipes? We knew that most of the piping advertised with us includes a diameter, but every once in a while, we’ll get an ad for, say, schedule 40 PVC pipe. What does that mean?
Since pressure is very important when it comes to heating & plumbing, the schedule of a pipe is an indicator of the thickness of the pipe wall. In other words, it’s used to determine the specific use for that pipe. As you might have guessed, a thicker pipe (with a higher schedule number) would be suitable for heavy-duty (or high pressure) applications.