API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

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2-48 API RECOMMENDED PRACTICE 581125Area 'C'Application of Nickel Alloys to Be Considered in This Area100Area 'B'Nickel Alloy Trim for ValvesIn Areas 'B' & 'C'Carbon SteelStress Relieve Welds & BendsTemperature, C7550Area 'A'25Carbon SteelNo Stress Relief Necessary0-250 10 20 30 40 50Concentration NAOH, % By WeightFigure 6.1M—Susceptibility of Caustic Cracking in Carbon Steel
RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-49STEP 1: Determine the susceptibilityfor cracking.Crackspresent?YesHighSusceptibilityCracksRemoved?NoYesNoStressrelieved?YesNot SusceptibleFFSNoNaOHConcentrationPlot Point on NACE CausticSoda Service Graph inFigure 6.1.TemperatureYesPlot in Area“A”?NoYesNaOH conc.< 5%wt?NoYesHeat traced?Heat traced?YesNoNaOH conc.< 5%wt?NoNoHighSusceptibilityYesSteamed Out?YesMediumSusceptibilitySteamed Out?NoNoYesMediumSusceptibilityLow SusceptibilityNot SusceptibleSTEP 2: Determine the severity indexfrom Table 6.2.STEP 3: Determine the time in-service,age, since the last inspection.STEP 4: Determine the number of inspectionsand the corresponding inspectioneffectiveness category for all past inspectionsusing Table 2.C.9.3.STEP 5: Determine the base damagefactor for caustic cracking using Table6.3.STEP 6: Calculate the escalation in thedamage factor using Equation (2.25).Figure 6.2—Determination of the Caustic Cracking DF
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Risk-Based Inspection MethodologyAP
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ForewordNothing contained in any AP
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CONTENTS1 SCOPE ...................
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PART 2PROBABILITY OF FAILURE METHOD
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5.8 Figures .......................
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RISK-BASED INSPECTION METHODOLOGY,
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CONTENTSTABLE 2.A.1—LEADERSHIP AN
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PART 2, ANNEX 2.BDETERMINATION OF C
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2.B.8 AMINE CORROSION .............
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Risk-Based Inspection MethodologyPa
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CONTENTSOVERVIEW ..................
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PART 3CONSEQUENCE OF FAILURE METHOD
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4.6.5 Releases to the Environment .
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5.9.7 Determination of Final Toxic
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3-2 API RECOMMENDED PRACTICE 581[7]
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CONTENTS3.A.1 GENERAL .............
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CONTENTS1 GENERAL………………
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PART 5SPECIAL EQUIPMENT5-1
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Consequence of Failure Methodology
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API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

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