Surveying of buried pipelines

Details Surveying of buried pipelines Surveying of buried pipelines

2005-02-11

2009-12-22

LeDynh, Bot L (Department: 2858)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

C324S202000, C324S228000

Reexamination Certificate

active

07635976

ABSTRACT:
A method of surveying a pipeline is provided. The pipeline comprises a tubular member with a protective wrapping. The method comprises the steps of applying signal to the pipeline from a first location, which first location is remote from the pipeline, and measuring the signal from a second and third locations. The second and third locations are remote from the pipeline and the second location is spaced from the third location along the pipeline. The signals received at the second and third location are used to provide an indication of deterioration of the signal along the tubular member and/or wrapping between the second and third locations.

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patent: 0 855 595 (1998-07-01), None
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Proceedings from NACE Conference 1987, “Electromagnetic Techniques for Monitoring Pipeline Coatings”,Corrosion87, vol. 311, Mar. 1987, pp. 1-10.

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