API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
2.B-74 API RECOMMENDED PRACTICE 581Table 2.B.10.3—Acid Sour Water Corrosion—Basic Data Required for AnalysisOxygen ContentAdjustment Factor—F oNot significant (≤50 ppb) 1.0High (>50 ppb) 2.0
RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.B—DETERMINATION OF CORROSION RATES 2.B-752.B.10.7FiguresStartIs H 2 0Present?YesDetermine pHIspH > 7?YesProceed toParagraph 2.B.7.NoNoEstimated CorrosionRate is 0NoIspH < 4.5?YesAre ChloridesPresent?YesProceed toParagraph 2.B.2.NoMaterial ofconstruction iscarbon or lowalloy?NoCR=2mpyYesDetermine corrosionrate CR pH fromTable 2.B.10.2.• pH• Temperature °FDetermine adjustmentfactor for oxygen FromTable 2.B.10.3.Oxygen (ppb)Determine adjustmentfactor for velocity F v fromEquations 2.B.2 to 2.B.4.Velocity (fps)Calculate Final CorrosionRateCR = CR pH x F o x F vEstimatedCorrosion RateFigure 2.B.10.1—Acid Sour Water—Determination of Corrosion Rate
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2.B-74 API RECOMMENDED PRACTICE 581
Table 2.B.10.3—Acid Sour Water Corrosion—Basic Data Required for Analysis
Oxygen Content
Adjustment Factor—F o
Not significant (≤50 ppb) 1.0
High (>50 ppb) 2.0
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