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

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2.B-86 API RECOMMENDED PRACTICE 5812.B.11.4CRCR BNomenclatureis the corrosion rate, mm/yr (mpy)is the base corrosion rate, mm/yr (mpy)C1 C4→ are the pH s calculation parametersF TF VLSIpH apH sRSIT adjustT opV a∆T2.B.11.5is the corrosion rate temperature correctionis the corrosion rate velocity correctionis the Langelier Saturation Indexis the actual pHis the pH of the sampleis the Ryznar Stability Indexis used to calculate the temperature adjustment = 24 °C (75 °F)is the corrosion operating temperature, °C (°F)is the actual velocity, m/s (ft/s)is the temperature difference, °C (°F)ReferencesSee References [130], [131], [132], [133], [134], [135], [136], [137], and [138] in Section 2.2.
RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.B—DETERMINATION OF CORROSION RATES 2.B-872.B.11.6TablesTable 2.B.11.1—Cooling Water Corrosion—Basic Data Required for Analysis: RecirculatingCooling Water Systems and Once Through Cooling Water System with Fresh WaterBasic DataMaterial of constructionActual corrosion ratesMetal temperature of cooling orcondenser surfaces, (°C:°F)pH apH sTDS (mg/L)CommentsDetermine the material of construction of the equipment/piping. Onlycarbon steel components are covered.Corrosion coupon data on this system or similar systems or actual ratesat the facility. Caution is warranted when using corrosion rates asdetermined from corrosion coupons or actual measured rates fromsystem measurements. These measurements may not be representativeor indicators of worst case. Example would be coupons placed in flowingstreams that could not provide data on for deposits or no flow areas.Determine the estimated metal temperature exposed to the coolingwater, i.e. water-side metal surface temperature.Experimentally measured pH of the water.pH value at which the water is in equilibrium with solid calciumcarbonate (CaCO 3 ).Determine if TDS is in the range of:a) 50 to 400 mg/L, orb) 401 to 1000 mg/LDetermine to what degree the TDS consist of salts (incl. ammonia),phosphates, Cu, etc. that potentially effect under-deposit corrosion.Ca (mg/L) as CaCO 3 Determine calcium hardness as calcium carbonate (CaCO 3 ).Methyl orange alkalinity (mg/L) as CaCO 3Flow velocity (m/s: ft/s)Chlorides (ppm Cl − )MIC observed or suspected? (Yes or No)DO (ppm O 2 )Corresponds to the concentration of bicarbonate (HCO 3 ), commonlyexpressed as parts per million or mg/L of CaCO 3 (calcium carbonate).Determine the maximum and minimum expected water velocities.Determine parts per million of chlorides.Indicate if MIC has been observed in the cooling water system, or if MICis considered likely.Dissolved oxygen.Table 2.B.11.2—Cooling Water Corrosion—Basic Data Required for Analysis: OnceThrough Cooling Water System with Salt WaterBasic DataMaterial of constructionActual corrosion ratesFlow velocity (m/s:ft/s)CommentsDetermine the material of construction of the equipment/piping. Only carbon steelcomponents are covered.Corrosion coupon data on this system or similar systems or actual rates at the facility.Determine the maximum and minimum expected water velocities.
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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 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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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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