CORROSION CORROSION CIRCUITSCIRCUITS

bybyArindam BaralArindam Baral

(Inspection Engineer –SEID;Saudi Kayan)(Inspection Engineer –SEID;Saudi Kayan)

DEFINITIONDEFINITION

PLANT IS DIVIDED INTO SMALL PLANT IS DIVIDED INTO SMALL SECTIONS– CORROSION CIRCUITS(SECTIONS– CORROSION CIRCUITS(CCCC))

THE FOLLOWING CONDITIONS SHALL THE FOLLOWING CONDITIONS SHALL BE BE SAMESAME IN A CC IN A CC

A)ENVIRONMENT CONDITIONA)ENVIRONMENT CONDITION

B)CONSTRUCTION OF MATERIALB)CONSTRUCTION OF MATERIAL

C)DEGRADATION MECHANISMSC)DEGRADATION MECHANISMS

INFORMATION REQD. INA CCINFORMATION REQD. INA CC

PROCESS CONDITIONPROCESS CONDITION CONSTRUCTION MATERIALSCONSTRUCTION MATERIALS INSPECTION HISTORYINSPECTION HISTORY POTENTIAL DEGRADATION POTENTIAL DEGRADATION

MECHANISMMECHANISM CONCERN OF INTEGRITY with respect toCONCERN OF INTEGRITY with respect toa)Process monitoring/control b)on-line corrosion a)Process monitoring/control b)on-line corrosion

monitoring c)start up/shutdown d)special monitoring c)start up/shutdown d)special inspn. requirementinspn. requirement

DAMAGE MECHANISMS SCOPEDAMAGE MECHANISMS SCOPE

ITS SCOPE IS RELATED TOITS SCOPE IS RELATED TO

A)A) IMPACT ON PROCESS OPERABILITYIMPACT ON PROCESS OPERABILITY

B)B) IMPACT ON MAINTENANCEIMPACT ON MAINTENANCE

C)C) IMPACT ON RELIABILITYIMPACT ON RELIABILITY

PROBABILITY OF CORROSION PROBABILITY OF CORROSION MECHANISMMECHANISM

IT IS ESSENTIAL TO KNOW THE IT IS ESSENTIAL TO KNOW THE PROBABILITY OF DAMAGE PROBABILITY OF DAMAGE MECHANISMS & IT CAN BE GRADED ASMECHANISMS & IT CAN BE GRADED AS

A)NEGLIGIBLEA)NEGLIGIBLE

B)LOWB)LOW

C)MEDIUMC)MEDIUM

D)HIGHD)HIGH

BASED ON CORROSION CIRCUITS A BASED ON CORROSION CIRCUITS A MORE PRO-ACTIVE RISK BASED MORE PRO-ACTIVE RISK BASED INTEGRITY CONTROL CAN BE INTEGRITY CONTROL CAN BE DEVELOPED(RBI)DEVELOPED(RBI)

SO THE STUDY OF CC CAN BE USED AS SO THE STUDY OF CC CAN BE USED AS AN INPUT FOR RBI ANALYSISAN INPUT FOR RBI ANALYSIS

THEN POTENTIAL RISK AREAS THEN POTENTIAL RISK AREAS THROUGH OUT THE PLANT IS THROUGH OUT THE PLANT IS IDENTIFIED.IDENTIFIED.

QQ

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