We are able to inspect pipes from the inside over a range of 1000 feet, with an intrinsic device (ATEX).
We can inspect pipes 6 "in diameter and larger using our motorized robots.
We particularly love our robots ... but they repair themselves much better than a worker.
For certain confined spaces with possible dangers for workers, such as falling refractory concrete, it may be very wise to make a good visual inspection using a robot in order to secure the environment before workers enter.