Method of examining an inside surface-coated metallic pipe...

Details Method of examining an inside surface-coated metallic pipe... Method of examining an inside surface-coated metallic pipe...

G - Physics

08

B

340/124

G08B 21/00 (2006.01) G01N 27/20 (2006.01)

Patent

CA 2002454

Abstract of the Disclosure A process for detecting a poorly coated portion of an inside surface of a pipe coated with insulation coat comprises the steps of providing a plurality of pigs on a conductor at predetermined intervals, preparing a running element provided with many electrode needles radially between these pigs, inserting the running element into the pipe while measuring the insulation resistance between the pipe and the conductor, and moving the running element inside the pipe by adjusting the pressure inside the pipe. From the above process, when the electrode needles make contact with a poorly coated portion of the inside surface while the running element is moving inside the pipe, the insulation resistance between the pipe and the conductor is decreased, thereby enabling the presence or a poorly coated portion and its position to be easily detected.

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