Pipeline pigs
AssigneeUnderground Location Services Limited
InventorTrevor Clifford Jones
Life of this patent
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Abstract
A magnetically detectable attachment for a pipeline pig comprises a wheel formed from two discs of magnetic material which serve as pole pieces for a permanent magnet mounted therebetween. The wheel is arranged, in use, to run along the top of the inside of the pipeline so as to magnetize a narrow longitudinal strip of the pipeline wall as the pig passes therealong.
Claims9
A magnetically detectable attachment for a pipeline pig comprising a wheel formed from two circular plates of magnetic material spaced apart for rotation on a common axis, means for producing a magnetomotive force between the rims of said circular plates and means for rotatably mounting the wheel on a pig with its axis of rotation perpendicular to the longitudinal axis of the pig so that, in use, it rolls along with the peripheries of the two discs in contact with the inner surface of a pipe wall.
Dependencies are inferred from the claim text.