Corrosion and Corrosion Control
an endless battle against nature
Starting from the 90s, the AC interference attracts more attention of corrosion engineers due to the intensive use of very high electrical resistance coating of pipelines as well as sharing the Right of Way (ROW) between power transmission line with pipeline,…
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In Queensland, A registrable system is an impressed current cathodic protection system the converter of which is capable of delivering a current greater than 0.25A. However, a CP system, whether is registrable or non registrable, is required for initial start-up…
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The electrical isolation status of buried isolator is more difficult to be tested. The overall resistance is equivalent of parallel resistance of soil and insulator. In a very low soil resistivity environment, the overall resistance for an properly functioning insulating…
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Point-to-Point Continuity Test Procedure Power off the cathodic protection unit; Connect test leads to voltmeter on 2 volt (or lower) DC range; Place test leads to individual structures Test and record voltages observed Make the judgement based on the following…
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Remote Earth Potential Procedure Place reference electrode at a location remote (10 – 30m) from all cathodically protected structures. The remote reference electrode is not directly over any buried metallic structure or shielded by such structure; Be sure that reference…
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