How is wall thickness determined in carbon steel pipe?

• A. By the schedule of the pipe
• B. Through the type of joint
• C. By the length of the pipe
• D. By the manufacturer's standard

Answer: (A)

Wall thickness in carbon steel pipe is determined primarily by the schedule of the pipe. The schedule numbers indicate the wall thickness relative to the nominal pipe size, where a higher schedule number corresponds to a thicker wall and a lower number represents a thinner wall. This system allows for standardization and makes it easier for pipefitters and engineers to select the appropriate pipe for specific applications by understanding how the wall thickness affects pressure capacity and structural integrity.

While the type of joint and the manufacturer's standards can provide additional context for tolerances and manufacturing practices, the actual thickness of the pipe wall itself is fundamentally associated with its schedule specification. The length of the pipe is generally irrelevant to wall thickness, as length pertains to other aspects of installation and support rather than dimensional attributes like thickness.