cathodic protection for pipelines & casings. corrosion process
TRANSCRIPT
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Cathodic Protectionfor Pipelines & Casings
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Corrosion Process
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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
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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.
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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 Accessories Measuring Equipments
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Electrical Isolation From Other Structures is Necessary
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Pipeline CP Systems: 1. Cathodic Protection for Simple pipeline
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2. Cathodic Protection for pipeline with more components
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2. Cathodic Protection for pipeline with more components
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2. Cathodic Protection for pipeline with more components
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3. Temporary CP system for pipeline by using Sacrificial anodes
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Casing CP System
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Casing CP System
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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
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Cathodic Protection ProcedureENGINEERING
Site Survey Report
Description & Standards
Detail Design
Design Criteria & Calculations
Material Specification
Installation Instructions
Start up & Commissioning
Documentation
Maintenance Instructions