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

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2-52 API RECOMMENDED PRACTICE 581e) STEP 5—Determine the base DF for amine cracking,amineD fB, using Table 6.3 based on the number ofinspections and the highest inspection effectiveness determined in STEP 4 and the Severity Index, S VI ,from STEP 2.f) STEP 6—Calculate the escalation in the DF based on the time in service since the last inspection usingthe age from STEP 3 and Equation (2.24). In this equation, it is assumed that the probability for crackingwill increase with time since the last inspection as a result of increased exposure to upset conditionsand other non-normal conditions.amine11 .( fB ( ) )amineD f = min D ⋅ max[ age, 1. 0] , 5000(2.24)7.7 Nomenclatureageis the component in-service time since the last cracking inspection or service start dateamineD is the DF for amine crackingfamineD fBis the base value of the DF for amine crackingS VIis the Severity Index7.8 ReferencesSee References [23], [24], [25], [26], [27], [28], and [29] in Section 2.2.7.9 TablesTable 7.1—Data Required for Determination of the DF—Amine CrackingRequired DataSusceptibility (Low, Medium, High)Amine solution compositionMaximum process temperature, °C (°F)Steam out? (Yes or No)Age (years)Inspection effectiveness categoryNumber of inspectionsCommentsThe susceptibility is determined by expert advice or using the procedures in thissection.Determine what amine solution composition is being handled in this component.Fresh amine has not been exposed to H 2 S or CO 2 . Lean amine contains lowlevels of H 2 S or CO 2 . Rich amine contains high levels of H 2 S or CO 2 . Forcomponents exposed to both lean and rich amine solutions (i.e. amine contactorsand regenerators), indicate lean.Determine the maximum process temperature in this component.Determine whether the component has been steamed out prior to water flushingto remove residual amine.Use inspection history to determine the time since the last SCC inspection.The effectiveness category that has been performed on the component.The number of inspections in each effectiveness category that have beenperformed.
RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-53Table 7.2—Determination of Severity Index—Amine CrackingSusceptibilitySeverity Index—S VIHigh 1000Medium 100Low 10None 0
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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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12.7 Nomenclature .................
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19.6 Determination of the Damage Fa
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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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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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