What is a common term used to describe the various wall thicknesses of plastic pipes?

• A. Diameter
• B. Schedules
• C. Lengths
• D. Grades

Answer: (B)

The term that describes the various wall thicknesses of plastic pipes is "schedules." In the context of piping, particularly plastic pipes, "schedule" refers to a standardized designation that indicates the wall thickness relative to the pipe's diameter. Different schedules, such as schedule 40 or schedule 80, denote specific thickness levels, which in turn affect the pressure rating and overall performance of the pipe. This classification is crucial for ensuring that the selected pipe can handle the intended pressure and application.

In contrast, terms like diameter refer specifically to the width of the pipe, lengths refer to the physical size of the pipe piece, and grades typically pertain to the material quality rather than wall thickness. Understanding schedules is essential for pipefitting professionals to make informed decisions about which type of pipe to use for specific applications.