Offshore pipeline electrical survey method and apparatus

Details Offshore pipeline electrical survey method and apparatus Offshore pipeline electrical survey method and apparatus

1978-02-27

1980-10-14

Strecker, Gerard R.

Electricity: measuring and testing

Electrolyte properties

324 52, 324 54, 324 65CR, 324 71R, 324365, G01V 315, G01N 2726, G01R 3100

Patent

active

042283990

ABSTRACT:
A method and apparatus for conducting offshore pipeline electrical surveys is characterized by initially locating and marking the pipeline, traversing the length of the pipeline towing a reference electrode in close proximity to the structure, providing a supply of wire having one end electrically and mechanically connected to the pipeline at a reference location, playing out the wire along the length of the pipeline through a distance measuring device while transporting the supply of wire and towing the reference electrode, and measuring and recording the potential difference between the reference electrode and pipe either continuously or at spaced test locations along the length of the structure. The method and apparatus are further characterized by alternately connecting and disconnecting an electrical power source to the pipeline at the reference location, measuring and recording the potential difference in both connected and disconnected modes at the test locations, and measuring and recording the depolarization and/or polarization times when the power source is disconnected and/or connected, respectively, to the pipeline.

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patent: 3735249 (1973-05-01), Stoll
patent: 4078510 (1978-03-01), Morgan
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