ClassificationIOWEstablished Limits of Operating conditions
(Process variables) outside which Integrity of Equipment is
affaectedIOWS1. Chemical2. PhysicalPHPressure -OpWater
ContentPressure -DesignMinSalt ContnetMaxAcid gas
LoadingTempOpSulfur contnetTemo-DesignMinNh4Hs
lmitsMaxNH3ContnetPartial pressureTANDew PointAcid StrengthDry
pointAmine strengthHeating rate Inhibitor concentration Cooling
rateChloride levelDelta POxygen contnetFlowrateH2
contnetetcInjection ratevelocity-ErosionetciowRisk based
ClASSIFICATION CriticalSatndardInformational
ActivityACTVITIESStudy of process8Study of Operation8Study of
Startup and Shutdon procedure8Study of PFDS8Study of HMB8Study of
P&IDs24Study of Corrosion inhibition philosophy
EquipmentPDS1MDS1
StepsStep-1Study Operating and nech design
ConditionsMOC(incluiding Startup, Procedures, catalyst regenration
procedures etc)Step-2Study -Anticipated Future Unit/Equipment
operating condtionsestablish operating premise W.r.t time (with
acceptable damage or Corrosion rate)Step-3Idnetify Active and
Potential type of degradationDetermine Historical damage rate and
predicted future rateIdentify variables which cause the progress of
damage, co variables etcIdentify key monitoring paramters and set
their limitsDetrmine Level of IOW (Critical, Satndard or
Informational)Use Risk ranking processSet limitsSet levels of
IOWActions needs to be taken and resposne timing for each IOW
exceedance
