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Cathodic Protection for Pipelines & Casings. Corrosion Process.

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Presentation on theme: "Cathodic Protection for Pipelines & Casings. Corrosion Process."— Presentation transcript:

1 Cathodic Protection for Pipelines & Casings

2 Corrosion Process

3 Corrosion Can be Defind as Either: Practical:Practical: Tendency of a Metal to Revert into its Native State Scientific: Scientific: Electrochemical Degradation of Metal as a Result of a Chemical Reaction with its Environment


5 Cathodic Protection Cathodic 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 Rectifier Impressed Current Anodes Permanent Test Stations Enclosures/Cabinets/Boxes Alternative DC Power Surces Sacrificial Anodes Permanent Reference Electrodes Cables Cable 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



12 3. Temporary CP system for pipeline by using Sacrificial anodes

13 Casing CP System


15 Cathodic Protection Procedure MEASUREMENTS Survey of CP Stations Soil Resistivity Measurements Current Density Measurements Calculation of Protective Range Survey of Electrical Power Supply for CP Station

16 Cathodic Protection Procedure ENGINEERING Site Survey Report Description & Standards Detail Design Design Criteria & Calculations Material Specification Installation Instructions Start up & Commissioning Documentation Maintenance Instructions

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