Centralizers for inspection of lined pipelines

A centralizer for centrally locating measuring/testing equipment within the interior of a pipeline while traveling through the pipeline, comprising:

• (a) a first annular face structure;
• (b) a second annular face structure nominally spaced from the first face structure along the direction of movement of the centralizer, the first and second face structures nominally aligned with each other along a first axis coinciding with the direction of travel of the centralizer through the pipeline;
• (c) a plurality of radially outwardly curved loops extending between the first and second face structures;
• (d) one or more wheels mounted on the loops to define the maximum outer perimeter of the centralizer, said one or more wheels mounted on a rotational axis extending nominally transversely to the first axis, the one or more wheels adapted to roll against the interior of the pipeline structure being inspected/tested.