Why is it required to ream the end of a pipe cut with a pipe cutter?

Reaming the end of a pipe cut with a pipe cutter is essential to ensure smooth fluid flow within the pipe. When a pipe is cut using a cutter, the cutting process can leave a small lip or burr on the inside edge of the pipe. This lip can obstruct the flow of water, potentially causing turbulence or reducing the cross-sectional area through which the fluid travels. By reaming the end, you remove this lip, allowing for a more unobstructed passage for the water, which enhances efficiency in the plumbing system.

This process is crucial when dealing with water supply lines or any other fluid-carrying pipes where maintaining optimal flow is key to the system's overall performance. Reaming not only improves flow dynamics but also helps prevent potential issues like corrosion or sediment buildup that can occur at points of obstruction.