Cathodic Protection for Pipelines Casings Corrosion Process Corrosion

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 Piles, Ships, Offshore Oil Platforms and onshore Oil & Gas Well casings.

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 Cable Connection Accessories 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 Criteria & Calculations Material Specification Installation Instructions Start up & Commissioning Documentation Maintenance Instructions