Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1980-08-11
1983-06-28
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 52, 324326, G01R 3100, G01R 3112, G01V 3165
Patent
active
043908365
ABSTRACT:
A method and apparatus are provided for detecting and locating holidays in an insulating coating of a subterranean pipeline. An alternating current is induced in the portion of the pipeline being surveyed. The pipeline is tracked by sensing the normal electromagnetic field generated by the current flowing in the pipeline. Leakage current indicative of the location and magnitude of a holiday in the pipeline coating is sensed by a pair of coil members adapted to be located above the ground on opposite sides of a vertical plane including the longitudinal axis of the pipeline with the central axes of the coil members being oriented generally parallel to the central axis of the pipeline, whereby an electrical current signal is induced in the pair of coil members by an electromagnetic field generated by the leakage current. The electrical current signal is displayed to provide an indication of the location and magnitude of the holiday.
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Bruce Charles R.
Johnson Irvin D.
Hummel Jack L.
Marathon Oil Company
Strecker Gerard R.
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