What is the most common method for inspecting the exterior of a pipe for damage?

The most common method for inspecting the exterior of a pipe for damage is visual inspection. This approach is straightforward and allows for a quick assessment of the pipe's condition. Inspectors can look for signs of wear, corrosion, dents, cracks, and other visible defects without the need for complicated equipment.

Visual inspection is often the first step in evaluating the integrity of a pipe because it can be done easily and quickly in various environments. This method is effective in identifying surface-level issues that may need further investigation or immediate repair.

Other methods, while valuable in specific contexts, typically require more technical expertise, specialized equipment, and significant time investment. For instance, ultrasonic testing focuses on evaluating wall thickness and internal flaws rather than exterior damage, pressure testing assesses the system's ability to hold pressure under certain conditions, and radiographic inspection is used for detailed internal examination rather than just surface issues. Thus, visual inspection is the practical choice for initial evaluations.