Transcript שקופית 1
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