Cathodic ProtectionCathodic Protection

Presentation on Cathodic Protection System, Presentation on Cathodic Protection System, at IOCL KBPL Kandla.at IOCL KBPL Kandla.Dt. 19.04.2006Dt. 19.04.2006

By By Corrosion MattersCorrosion Matters

HyderabadHyderabadAn Advisory services company.An Advisory services company.

WelcomeWelcome

CORROSIONCORROSION““The deterioration of a material, The deterioration of a material,

usually a metal, that results from a usually a metal, that results from a reaction with its environment.”reaction with its environment.”

TYPICAL CORROSION CELLTYPICAL CORROSION CELL

FORMS OF CORROSIONFORMS OF CORROSION

GENERALGENERAL LOCALIZEDLOCALIZED GALVANICGALVANIC

ENVIRONMENTAL ENVIRONMENTAL CRACKINGCRACKING VELOCITY EFFECTVELOCITY EFFECT INTERGRANULARINTERGRANULAR

DEALLOYINGDEALLOYING FRETTINGFRETTING HIGH-HIGH-TEMPERATURETEMPERATURE

SOME VARIABLES IN THE SOME VARIABLES IN THE CORROSION CONTROL PROCESSCORROSION CONTROL PROCESS

pHpH OXYGENOXYGEN RESISTIVITYRESISTIVITY TEMPERATURETEMPERATURE COATING PROPERTIESCOATING PROPERTIES ELECTROLYTE ELECTROLYTE

MOISTURE CONTENTMOISTURE CONTENT

ANODE MATERIALANODE MATERIAL ANODE LOCATIONANODE LOCATION ANODE SIZEANODE SIZE ANODE SHAPEANODE SHAPE STRUCTURE STRUCTURE

MATERIALMATERIAL BACTERIABACTERIA OTHER MINERALS IN OTHER MINERALS IN

ELECTROLYTEELECTROLYTE

CORROSION CONTROL CORROSION CONTROL MEASURESMEASURES

MATERIALS SELECTIONMATERIALS SELECTION

DESIGN CONSIDERATIONSDESIGN CONSIDERATIONS

PROTECTIVE COATINGS AND LININGSPROTECTIVE COATINGS AND LININGS

CATHODIC PROTECTIONCATHODIC PROTECTION

INHIBITORSINHIBITORS

BASIC CATHODIC BASIC CATHODIC PROTECTIONPROTECTION

BASIC CATHODIC PROTECTION BASIC CATHODIC PROTECTION IIII

SOME CP DESIGN SOME CP DESIGN CONSIDERATIONSCONSIDERATIONS

ELECTROLYTE RESISTIVITYELECTROLYTE RESISTIVITY SYSTEM LIFE REQUIREMENTSSYSTEM LIFE REQUIREMENTS COATING EFFICIENCYCOATING EFFICIENCY CURRENT REQUIRED FOR PROTECTIONCURRENT REQUIRED FOR PROTECTION ECONOMIC FACTORSECONOMIC FACTORS PHYSICAL CONFIGURATION OF PHYSICAL CONFIGURATION OF

STRUCTURE STRUCTURE MATERIALS USED IN STRUCTUREMATERIALS USED IN STRUCTURE.. ANODE CHARACTERISTICSANODE CHARACTERISTICS

CP CONSTRUCTION CP CONSTRUCTION CONSIDERATIONSCONSIDERATIONS

PREPARATION OF METAL SURFACE FOR PREPARATION OF METAL SURFACE FOR COATINGCOATING

PROPER SELECTION AND APPLICATION OF PROPER SELECTION AND APPLICATION OF COATINGCOATING

PROCUREMENT OF CP EQUIPMENT PROCUREMENT OF CP EQUIPMENT MEETING SPECIFICATIONSMEETING SPECIFICATIONS

SUPERVISION OF INSTALLATION BY SUPERVISION OF INSTALLATION BY QUALIFIED PERSONNELQUALIFIED PERSONNEL

ENERGIZING, ADJUSTMENT, AND TESTING ENERGIZING, ADJUSTMENT, AND TESTING BY QUALIFIED PERSONNELBY QUALIFIED PERSONNEL

MAINTENANCE AND REPAIR MAINTENANCE AND REPAIR CONSIDERATIONSCONSIDERATIONS

WEEKLY RECTIFIER READINGS RECORDED WEEKLY RECTIFIER READINGS RECORDED AND SENT TO DISTRICT CP SPECIALIST AND SENT TO DISTRICT CP SPECIALIST FOR REVIEWFOR REVIEW

ANNUAL PROTECTIVE POTENTIAL SURVEY ANNUAL PROTECTIVE POTENTIAL SURVEY PERFORMED BY QUALIFIED PERSONNELPERFORMED BY QUALIFIED PERSONNEL

NECESSARY SYSTEM ADJUSTMENTS MADE NECESSARY SYSTEM ADJUSTMENTS MADE BY QUALIFIED PERSONNELBY QUALIFIED PERSONNEL

NECESSARY REPAIRS MADE AS SOON AS NECESSARY REPAIRS MADE AS SOON AS POSSIBLE AND RETEST IF NECESSARYPOSSIBLE AND RETEST IF NECESSARY

SUMMARYSUMMARY

THERE ARE MANY FORMS AND MECHANISMS THAT CAUSE THERE ARE MANY FORMS AND MECHANISMS THAT CAUSE CORROSION.CORROSION.

PROPER CORROSION CONTROL SAVES MONEY, AND PROPER CORROSION CONTROL SAVES MONEY, AND IMPROVES OPERABILITY AND SAFETY AND PROTECTS THE IMPROVES OPERABILITY AND SAFETY AND PROTECTS THE ENVIRONMENT.ENVIRONMENT.

CATHODIC PROTECTION IS A PROVEN EFFECTIVE METHOD CATHODIC PROTECTION IS A PROVEN EFFECTIVE METHOD OF CORROSION CONTROL.OF CORROSION CONTROL.

CORROSION CONTROL IS COMPLEX, REQUIRING SPECIAL CORROSION CONTROL IS COMPLEX, REQUIRING SPECIAL EXPERTISE FOR SUCCESSFUL DESIGN, CONSTRUCTION, EXPERTISE FOR SUCCESSFUL DESIGN, CONSTRUCTION, AND MAINTENANCEAND MAINTENANCE

Sketch for CP SystemSketch for CP System

CP System for Existing Buried CP System for Existing Buried LinesLines

CP Station for PipelinesCP Station for Pipelines

Anode Junction BoxAnode Junction Box

Deepwell Anode GroundbedDeepwell Anode Groundbed

Indoor Type RectifierIndoor Type Rectifier

Outdoor Type RectifierOutdoor Type Rectifier

Hi Silicon Chromium AnodesHi Silicon Chromium Anodes

Titanium Rod Type AnodeTitanium Rod Type Anode

Sacrificial Anode - MgSacrificial Anode - Mg

Mg. Anodes with tail cablesMg. Anodes with tail cables

Bullet Tanks CP SystemBullet Tanks CP System

Measurement of PotentialsMeasurement of Potentials

Railcrossings CP SystemRailcrossings CP System

Survey for Stray current CPSurvey for Stray current CP

Graphical presentation of DataGraphical presentation of Data

Data Logging Readings taken on Nov 7,05

0.510

0.520

0.530

0.540

0.550

0.560

0.570

0.580

0.590

19.42 19.43 19.44 19.45 19.46 19.47 19.48 19.49 19.50 19.51 19.52 19.53 19.54 19.55 19.56 19.57 19.58 19.59 20.00 20.01

Minutes

PS

P in

vo

lts

(-v

e)

Average PSP readings

Pourbix Diagram for Corrosion Pourbix Diagram for Corrosion PhenomenonPhenomenon

Temporary System for Current Temporary System for Current RequirementRequirement

End.End.

Thank YouThank You

We also make Electro Chlorination SystemsWe also make Electro Chlorination Systems