Spiral magnetic field apparatus and method for pipeline inspection
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United States of America Patent
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Jan 3, 2012
Grant Date -
Jul 28, 2011
app pub date -
Apr 8, 2011
filing date -
Nov 12, 2008
priority date (Note) -
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Abstract
A system and method are disclosed for inspecting the wall of a pipeline while traveling therethrough. The system may comprise a portion of pipe comprising a pipe wall forming a cylindrical tube defining a circumferential direction and an axial direction. The system may further include an in-line inspection tool positioned within the portion of pipe. The in-line inspection tool may include a frame extending in the axial direction and at least one magnet connected to the frame and positioned to generate a magnetic field. The magnetic field may be orientated obliquely with respect to the circumferential and axial directions of the pipeline. The inspection tool may include a transmitter connected to the frame to generate an inspection signal within the magnetic field.
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