3 Corrosion Can be Defind as Either: •Practical: Tendency of a Metal to Revert into it‘s Native State• Scientific: Electrochemical Degradation of Metal as aResult of a Chemical Reaction with itsEnvironment
5 Cathodic ProtectionCathodic protection (CP) is a technique to control the corrosion of a metal surface by making it work as a cathode of an electrochemical cell.Cathodic protection systems are most commonly used to protect Steel, water or fuel Pipelines and Storage tanks, steel pier Piles, Ships, Offshore Oil Platforms and onshore Oil & Gas Well casings.
6 Major Components of a Cathodic Protection system Transformer RectifierAlternative DC Power SurcesImpressed Current AnodesSacrificial AnodesPermanent Test StationsPermanent Reference ElectrodesEnclosures/Cabinets/BoxesCablesCable Connection AccessoriesMeasuring Equipments
7 Electrical Isolation From Other Structures is Necessary
8 Pipeline CP Systems: 1. Cathodic Protection for Simple pipeline
9 2. Cathodic Protection for pipeline with more components
10 2. Cathodic Protection for pipeline with more components
11 2. Cathodic Protection for pipeline with more components
12 3. Temporary CP system for pipeline by using Sacrificial anodes
15 Cathodic Protection Procedure MEASUREMENTSSurvey of CP StationsSoil Resistivity MeasurementsCurrent Density MeasurementsCalculation of Protective RangeSurvey of Electrical Power Supply for CP Station
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