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

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2.B-106 API RECOMMENDED PRACTICE 581M-506 gives some guidance on the calculation of the two-phase viscosity, density, and fluid velocity. Thesefactors depend on the volumetric ratio of the liquid flow to the flow, sometimes known as the liquid holdup,the amount of water in the liquid fraction, the gas water and oil viscosities at the temperature and pressure.These calculations are complex and go beyond the scope of an RBI study. If required, the analyst can referto the recommendations in NORSOK or use the software provided by NORSOK to perform the calculationsrecommended in M-506 to approximate the two-phase flow characteristics. While M-506 provides someguidelines for the calculation of bulk fluid properties, they do not explicitly account for the solubility of naturalgas in oil, which can also affect the all of these properties.2.B.13.3.7Adjustment for Inhibitors or GlycolThe addition of glycol reduces the CO 2 corrosion rate. M-506 accounts for this by simply reducing thecorrosion rate by applying a factor of the form:( [ ] )log ⎡10 F ⎤⎣ glycol ⎦= 1. 6⋅ log 100 −G−2(2.B.36)In Equation (2.B.36), G is the percent weight of glycol as a percent of water in the system. F glycol is limited toa minimum value of 0.008. The base corrosion rate is multiplied by the factor F glycol to account for thecorrosion reduction due to glycol.For other types of corrosion inhibitors added to the stream, M-506 requires that its effectiveness must beindependently determined and used directly as a reduction factor, F inhib . If both glycol and an inhibitor areused, the minimum of F inhib and F glycol should be used as shown in Equation (2.B.23).2.B.13.4aNomenclatureis the fugacity coefficientA is the pipe cross-sectional area, m 2 (ft 2 )CRCR BDeDff CO2f (T, pH)F glycolF inhibGmPis the corrosion rateis the base corrosion rateis the pipe diameter, m [ft]is the relative roughnessis the fraction factoris the CO 2 fugacity, baris the temperature-pH functionis the corrosion rate correction factor for glycolis the corrosion rate correction factor for the inhibitoris the percent weight of glycol as a percent of water in the systemis the calculated using the mass flux, kg/(m 2 -s) [lb/(ft 2 -s)]is the pressure, psia
RISK-BASED INSPECTION METHODOLOGY, PART 2, ANNEX 2.B—DETERMINATION OF CORROSION RATES 2.B-107p CO2P sat (T)is the CO 2 partial pressure, bar (psi)is the saturation pressure for water at temperature T, psia%w is the percent water by weight in the streamReRHSTT du mxis the Reynolds Numberis the relative humidityis the shear stress, Pais the temperature, °C (°F)is dew point temperature, °C (°F)is the mixture flow velocity, m/sis the ratio of the mass of water to the mass of dry gasρ m is the mixture mass density, kg/m 3μ mis the viscosity of the mixture, cP
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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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1-2 API RECOMMENDED PRACTICE 5811.4
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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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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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Page 285 and 286: RISK-BASED INSPECTION METHODOLOGY,
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Page 349 and 350: CONTENTSOVERVIEW ..................
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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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