Patent ID: 7859256

Claim:
A method comprising: obtaining an in-line inspection tool comprising a body portion comprising a first segment, a second segment trailing the first segment, and at least one coupler flexibly connecting the first segment to the second segment, a primary sensor suite riding on one of the first segment and second segment, and a secondary sensor suite riding on the other of the first segment and the second segment, the secondary sensor suite comprising at least one flux sensor and at least one flux concentrator; introducing the in-line inspection tool into a pipeline; inspecting, by the in-line inspection tool, the pipeline; detecting, by the primary sensor suite during the inspecting, both interior and exterior defects; detecting, by the secondary sensor suite during the inspecting, exclusively interior defects; receiving, by the at least one flux concentrator during the inspecting, a first magnetic flux; and delivering, by the at least one flux concentrator to the at least one flux sensor during the inspecting, a second magnetic flux, greater than the first magnetic flux.