Pica Pipeline Inspection and Condition Analysis Corporation

David Burton

David E Russell

An in-line inspection (ILI) toolfor use inspecting pipelines includes a plurality of collapsible guide centralizersconfigured and sized to correspond to the inside diameter of the pipeline being inspected. The guide centralizesinclude wheelsroll along the inside wall of the pipeline being inspected to maintain the guide centralizers 'centered' within the pipeline. A collapsible exciter unit centralizeris positioned between collapsible guide centralizersto 'center' the exciter unit centralizer relative to the interior of the pipeline. The exciter unit centralizergenerates signals in the form of an alternating magnetic field that travel along the wall of the pipeline which in turn generates eddy current signals. The eddy current signals undergo a change if a discontinuity in the pipeline is encountered by the inspection tool, which signal change or deviation is detected by a collapsible detector unit centralizerpositioned between the collapsible guide centralizers

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Edmonton, Canada

David Burton