What is the theoretical center of a pipe called?

The theoretical center of a pipe is referred to as the "springline." This term is used in the context of circular pipes and conduits where the springline is the horizontal line that runs around the circumference of the pipe at its midpoint, effectively dividing the pipe into upper and lower halves.

Understanding the concept of springline is crucial in various engineering applications, such as when calculating load distribution, assessing potential weaknesses, or determining how water or other fluids will flow through the pipe. The springline serves as a reference point in construction and design, impacting decisions related to excavation depth, structural support, and hydrodynamic calculations.

In contrast, the other terms refer to different aspects of a pipe's structure. The crown denotes the highest point of the pipe, which plays a significant role in drainage flow and potential blockages. The invert is the lowest point inside the pipe where the flow occurs, affecting how gravity influences fluid movement. The operating range pertains to the range of conditions under which a system functions safely and efficiently but does not specifically relate to the physical structure of the pipe itself.