Method of examining an inside surface-coated metallic pipe and a

Details Method of examining an inside surface-coated metallic pipe and a Method of examining an inside surface-coated metallic pipe and a

1989-11-21

1990-09-18

Yasich, Daniel M.

Electricity: measuring and testing

For insulation fault of noncircuit elements

Where a moving sensing electrode scans a stationary element...

73 405R, B61B 1308, G01N 2702

Patent

active

049581287

ABSTRACT:
A process for detecting a poorly coated portion of an inside surface of a pipe coated with an 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 easy detection of the presence of a poorly coated portion and its position.

REFERENCES:
patent: 2573815 (1951-11-01), Smith
patent: 3253217 (1966-05-01), Voltmann
patent: 4050384 (1977-09-01), Chapman
patent: 4244296 (1981-01-01), Vertut

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