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

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2-132 API RECOMMENDED PRACTICE 58119.9 FiguresHIGH SUSCEPTIBILITYExtending from the initialcurve and upwardsRepresentativeNelson CurveMEDIUM SUSCEPTIBILITYExtending from 50° belowthe curve up to the curve-50°FretuerapTem-100°FLOW SUSCEPTIBILITYNO SUSCEPTIBILITYExtending from 100°Fbelow the curve up to theprevious susceptibility areaExtending from 100° belowthe curve and farther belowthe initial curveHydrogen Partial PressureFigure 19.1—Example of HTHA Susceptibility Rankings for Cr-Mo Low Alloy Steels
RISK-BASED INSPECTION METHODOLOGY, PART 2—PROBABILITY OF FAILURE METHODOLOGY 2-133STEP 1: Determine the material ofconstruction, exposure temperature Tand the exposure hydrogen partialpressure P H2 .No, replaced withupgraded materialSTEP 2: Has HTHA damagebeen observed in thecomponent?YesIs thecomponentReplaced inKind?Yes, replacedin kindHighSusceptibilityNoNo, notreplacedDamageObservedSTEP 3 1): Is the componentcarbon or C-½ Mo steel?YesSTEP 3 1): Is thecomponentoperating > 177C (350F)and H2pp > 0.345 MPa (50psia)?YesHighSusceptibilityNoNoSTEP 3 2): Assign Susceptibility based onoperating condition and Figure 19.1NoSusceptibilitySTEP 4: Determine the damage factor forHTHA, using Table 19.2.20 Brittle Fracture DF20.1 ScopeFigure 19.2—Determination of the HTHA DFThe DF calculation for ferritic components subject to brittle fracture due to low-temperature operation iscovered in this section. Low alloy steels subject to embrittlement at relatively high temperature are not part ofthe scope in this section and are covered in Section 21.20.2 Description of DamageBrittle fracture due to low temperature operation or relatively low toughness is the sudden failure of astructural component, usually initiated at a crack or defect. This is an unusual occurrence because designstresses are normally low enough to prevent such an occurrence. However, some older equipment with thickwalls, equipment that might see low temperatures due to an upset, or equipment that has been modifiedcould be susceptible to varying degrees.
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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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Risk-Based Inspection MethodologyPa
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RISK-BASED INSPECTION METHODOLOGY,
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2.B.8 AMINE CORROSION .............
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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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CONTENTS5.A.1 General .............
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API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

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