cathodic protection - oisdoisd.gov.in/pdf/seminar_mo/cpmonitoringeffectiveness.pdf · cathodic...
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CATHODIC PROTECTIONMONITORING EFFECTIVENESS
ByDr M B Mishra
Corrosion Consultant
Presented At
O.I.S.D. WorkshopCritical Safety Issues In Marketting
OperationsStriving For Improved Performance
January,16,2014
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CORROSION[ METAL DEGRADATON DUE TO REACTING WITH
ENVIRONMENT ]RAVAGES VALUABLE ASSETS SUCH AS :
PIPELINES [UNDERGROUND / ABOVE GROUND]
TANKS[UNDERGROUND/ABOVE GRADE/MOUNDED]
RUTOR STEEL IN CONCRETE
STRUCTURALSOTHER ASSETS [PACE MAKER,JOINTS,DENTAL]
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CORROSIONRESULTS IN RUPTURE
CAUSINGHAZARDS – FIRE,POLLUTION,FATALITY
[HUMAN,FLORA,FAUNA]BESIDES
ECONONMIC LOSSESDUE TO
PRODUCT LOSS,REPAIR COST,DOWN TIME &COMPENSATION
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PIPELINE FAILURES
• ONCE PIPELINE LEAKCOMMENCES ITPROGRESSES INEXPONENTIAL RATE.
• CORROSION CAN BECONTROLLEDWITHIN ACCEPTABLELIMITS BYAPPLICATION OFCATHODICPROTECTION FROMCONSTRUCTIONSTAGE.
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FAILURE RATE COMPARISION
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PITTING NEAR THE JOINT AREA
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PIPELINE COATINGS AFTER EXCAVATION
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Nace Corrosion 2004
TANK BOTTOM PLATE PITTING CORROSION
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PIPE RUPTURE
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SEVERE CORROSION
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FAILURE FROM THE SEAM
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CORROSION CONTROL
• THE EFFORT IS TO MINIMIZE CORROSION,ANATURAL PHENOMENON,TO AN ACCEPTABLELIMIT SO THAT ECONOMIC VIABILITY ISENSURED
• THIS IS BEST ACHIEVED BY PROVIDING ASUITABLE COATING SUPPLEMENTED BY ACOMPATIBLE CATHODIC PROTECTION SYSTEM
AS A COMPOSITECORROSION PROTECTION SYSTEM
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CORROSION• Corrosion Reactions :• Fe ↔ Fe ++ + 2e- Anodic Reaction (1)• 2e- + 2H+ ↔ 2H →H2
• Or H2O +2e- +½ O2 →2(OH-)• Fe++ + 2OH- -------› Fe (OH)2
• Fe (OH)2 + ½ O2 +½ H2 O--------› Fe (OH)3[Green Colour]
• 2Fe (OH)3 --------›2 Fe 2 O 3 +3 H2 O[Rust, Brown colour]
•
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DISCRETE IMPRESSED CURRENT ANODES
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EFFECTS OF SOIL RESISTIVITY ON CURRENTDISTRIBUTION
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EFFECTS OF SOIL PROPERTIES ON CURRENTDISTRIBUTION
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CATHODIC PROTECTION
• IMPRESSED CURRENT CATHODICPROTECTION SYSTEM IS THE SECONDMETHOD AVAILABLE TO PROTECT THEUNDERGROUND UTILITIES FOR LONGERDURATIONS (UPTO 50 YEARS) AS IN THIS THEPOWER SOURCE & HENCE THE PROTECTIVECURRENT CAN BE CONTROLLED ASREQUIRED TO PROVIDE ADEQUATEPROTECTION THROUGHOUT. THIS INVOLVESUSE OF FOLLOWING ANODES;
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REFERENCE ELECTRODES
• TO MEASURE REPRODUCIBLE [P-S-P] THEFOLLOWING REFERENCE HALF CELL ARE INUSE
Cu-CuSO4(V) Zn(V) Ag-AgCl(V)
(-)0.75 (+)0.35 (-)0.7
(-)0.85 (+)0.25 (-)0.8
(-)1.0 (+)0.1 (-)0.95
(-)1.2 (-)0.1 (-)1.15
(-)1.5 (-)0.4 (-)1.45
(-)2.0 (-)0.9 (-)1.95
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CRITERIA FOR CATHODIC PROTECTION
• THREE PRIMARY CRITERIA FOR CATHODICPROTECTION OF UNDERGROUND ORSUBMERGED STEEL OR CAST IRON PIPEARE : (-)0.85V w.r.t. Cu-CuSO4 HALF CELL
REFERENCE ELECTRODE WITHPROTECTIVE CURRENT FOR CATHODICPROTECTION SYSTEM-APPLIED (ON). (-)0.85V w.r.t. Cu-CuSO4 HALF CELL
REFERENCE ELECTRODE WITHPROTECTIVE CURRENT FOR CATHODICPROTECTION SYSTEM-NOT APPLIED(INSTANT OFF).
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CRITERIA FOR CATHODIC PROTECTION
100mV POLARISATION VOLTAGE.
300mV SHIFT FROM NATURALPOTENTIALS WITH PROTECTIVECURRENT APPLIED (ON).
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POTENTIAL DISTRIBUTION ALONG THEPIPELINE
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PIPELINE COATING AND CATHODICPROTECTION SYSTEM ASSESSMENT
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PIPELINE COATING AND CATHODICPROTECTION SYSTEM ASSESSMENT
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CATHODIC PROTECTION FOR ABOVE GROUNDSTORAGE TANK BOTTOMS
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CATHODIC PROTECTION FOR ABOVE GROUNDSTORAGE TANK BOTTOMS
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CATHODIC PROTECTION FOR ABOVE GROUNDSTORAGE TANK BOTTOMS
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Nace Corrosion 2004
Installation of the Anodeflex System. It provides Cathodic Protection on everypoint without causing any under or overprotection
COATING AND CATHODICPROTECTION SYSTEM ASSESSMENT
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Nace Corrosion 2004
REF. ELECTRODE
CONCEPTUAL DESIGN OF CP FORBULLET TANKS
SAND MOUND
TOTR UNIT
POLYMERIC ANODE
LPG BULLET
INLINE
SPLICE
CONNECTINGCABLES
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Nace Corrosion 2004
LONG LINE POLYMERIC ANODE SYSTEM FORMOUNDED BULLET
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Nace Corrosion 2004
CONCEPTUAL DESIGN OF CP FOR BULLET TANKS
POLYMERIC ANODE
LPG BULLET
INLINE
SPLICE
CONNECTINGCABLES
TRUNIT
AJB
CJB
REJB
+ ve- ve
Ref Cell
ISOLATING JOINTPOLARIZATON
CELLEARTHING
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Nace Corrosion 2004
REF. ELECTRODE
CONCEPTUAL DESIGN OF CP FOR BULLET TANKS
BULLET-2
SAND MOUND
POLYMERIC ANODE
BULLET-1
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Corrosion Monitoring
• Cathodic Protection Of Assets EnsuresPrevention of Loss of Metal to Earth due toSoil-side Corrosion
• This is a Dynamic Process & Requires CloseMonitoring of C P Parameters
• If C P System Fails or is not performing as perDesign,Corrosion Protection is In-Effective
• The Efficacy Of C P depends on continuousMonitoring to Ensure Desired Level ofParameters
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Corrosion Monitoring
• Pipe to Soil Potential [P-S-P] is Monitored[P-S-P] Vs CSE to be in the Range(-)0.85 Minimum to (-) 1.5 V Maximum when AnaerobicBacteria are absent [No SRB]
and (-)0.95 Minimum to (-) 1.5 V Maximum when [SRB]arepresent
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Corrosion Monitoring• Only High Impedance Voltmeter to be used• Equipment of Standard make & proven
capability to be used• Multichannel Recording capability• The Record should be field verifiable through
computer display in field• Recorded Data should be Downloaded
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Corrosion Monitoring
• For this Reason it is vitally importantthat utility Operators Maintainaccurate,Integrated Information on theirutility system from construction andInstallation throughOperataion,Inspection & Maintenance
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Corrosion Monitoring
• The Key to Integrity ManagementProgramme is :
1. To Know where PotentialProblems Lie
2. To Understand How Severe theProblem might be
3. How Best to Manage theseProblems
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Corrosion Monitoring
• Survey Data to be Collated for DecipheringProblem Areas & Effective Measures tocounter the problems detected
• Post Mitigative Measures installation Furthersurveys to evaluate Adequacy of installedmitigative measures
• Frequency of such surveys thereafterperiodically
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Corrosion MonitoringConclusion
• The Safety factor question has been settledmany times by Research,Experience and Tests.
• In service underground utilities are safe ifthey are maintained properly and protectedagainst Corrosion,that Devours the Vitalsunchecked and undetected,and third partydamage.
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AcknowledgementsGrateful Thanks To O.I.S.D.
For this Opportunity to Share My Perceptions& Experience on Cathodic ProtectionMonitoring With Such August AudienceComprising OfEngineering,Consultancy,Operations,Maintenance,Inspection,Cosntruction &Trouble Shooting Fraternity.
THANKS•