1. for Pipelines & Casings
Cathodic Protection
for Pipelines & Casings

2. Corrosion Process

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 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
Alternative DC Power Surces
Impressed Current Anodes
Sacrificial Anodes
Permanent Test Stations
Permanent Reference Electrodes
Enclosures/Cabinets/Boxes
Cables
Cable Connection Accessories
Measuring 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

13. Casing CP System

14. 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