Internal rotary inspection is a type of nondestructive testing (NDT) method used to inspect the inside of tubes, pipes, and other cylindrical components. The test is performed using a specialized tool, known as an internal rotary inspection tool, which is inserted into the component being tested. The tool is equipped with sensors, such as ultrasonic sensors or eddy current sensors, which are used to detect and evaluate defects in the material.

The tool is rotated inside the component, allowing the sensors to scan the entire inner surface of the component. The results of the inspection are typically displayed in the form of a visual representation of the component, showing the location and severity of any defects that were detected. This method is commonly used to inspect components in the aerospace, automotive, and oil and gas industries.