Electrical surveys of underwater or underground structures with

Electricity: measuring and testing – Determining nonelectric properties by measuring electric...

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324 72, 324348, G01V 308, G01V 315, G01R 3102

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active

044672748

ABSTRACT:
An electrical survey of buried structures such as underwater or underground pipelines utilizes the steps of connecting one end of an economically disposable wire from a wire supply to the structure, either directly or through a heavier lead, the opposite end being electrically connected to a cell. The cell is moved along the structure together with a wire supply and a meter to obtain periodic measured structure-to-electrolyte potential values. If the wire is accidentally or intentionally disconnected during the survey, a stationary electrode is positioned at the wire break or last valid measured reading, such electrode being reconnected to the free end of the wire from the supply. The survey then continues periodically obtaining electrode-to-cell potential values. A structure-to-electrolyte potential profile is obtained by summing the last valid recorded structure-to-electrolyte potential value with each electrode-to-cell values. The summing may be done after the survey is completed by computer.

REFERENCES:
patent: 2974276 (1961-03-01), Davis
patent: 2988691 (1961-06-01), McAlister et al.
patent: 3735249 (1973-05-01), Stoll
patent: 4063161 (1977-12-01), Pardis
patent: 4078510 (1978-03-01), Morgan
patent: 4151458 (1979-04-01), Seager
patent: 4365191 (1982-12-01), Weldon et al.

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