Cathodic Protection

for Pipelines & Casings

Corrosion Process

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

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 onshore

Piles

, Ships, Offshore

Oil & Gas Well casings

.

Oil Platforms

and

Major Components of a Cathodic Protection system Transformer Rectifier Impressed Current Anodes Permanent Test Stations Enclosures/Cabinets/Boxes Cable Connection Accessories Alternative DC Power Surces Sacrificial Anodes Permanent Reference Electrodes Cables Measuring Equipments

Electrical Isolation From Other Structures is Necessary

Pipeline CP Systems: 1. Cathodic Protection for Simple pipeline

2. Cathodic Protection for pipeline with more components

2. Cathodic Protection for pipeline with more components

2. Cathodic Protection for pipeline with more components

3. Temporary CP system for pipeline by using Sacrificial anodes

Casing CP System

Casing CP System

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

Cathodic Protection Procedure ENGINEERING

Site Survey Report Description & Standards Detail Design Design Criteria & Calculations Material Specification Installation Instructions Start up & Commissioning Documentation Maintenance Instructions