Anode monitoring
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United States of America Patent
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-
Sep 7, 2004
Grant Date -
May 2, 2002
app pub date -
Jan 2, 2002
filing date -
Jul 13, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An anode monitoring system for monitoring the integrity of anodes 2 provided on a metallic structure such as a pipeline system 1. A signal circuit S.sub.n including the pipeline 1 and one of the anodes 2 is set up and appropriate signals are looked for at a central station 4. Reception of the signal at the central station 4 is dependent on the integrity of the anode 2 under inspection at that time. If the anode 2 is missing or defective the expected signal is not received and thus the fault in the anode 2 can be detected. A notch filter 5 is inserted in series between each anode 2 and the pipeline 1. The filter 5 provides a high impedance which can be signalled across but does not interfere with the cathodic protection system.
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