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

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5-74 API RECOMMENDED PRACTICE 581P f (t)is the POF (loss of containment) of the protected equipment, failures/yearprdP f ,condis the conditional POFOD, failures/demandnP f ,j is the POF (loss of containment) of the protected equipment for the n th hole size associatedwith the j th overpressure demand case, failures/yearprdP f ,jis the POF of a PRD associated with the j th overpressure demand case, failures/yearprdP f ,prioris the prior POFOD, failures/demandprdP f ,wgtis the weighted POFOD, failures/demandP fodP fod,jis the PRD POFOD, failures/demandis the PRD POFOD associated with the j th overpressure demand case, failures/demandprdP lis the PRD probability of leakage, failures/yearprdP l ,wgtis the weighted probability of leakage, failures/demandP oP o,jis the overpressure likely to occur as a result of a PRD failing to open upon demand, kPa (psig)is the overpressure likely to occur as a result of a PRD failing to open upon demand,associated with the j th overpressure demand case, kPa (psig)prdP p,prior is the prior probability of passing on demand, failures/demandP sP setis the storage or operating pressure of the protected equipment, kPa (psig)is the set pressure of the PRD, kPa (psig)prdRisk is the total risk for a PRD, $/yearprdRisk fis the risk of a PRD failure to open, $/yearprdRisk f ,jis the risk of a PRD failure to open associated with the j th overpressure demand case, $/yearprdRisk lis the risk of PRD leakage, $/yearR(t)tt dur,it inspis the risk as a function of time, m 2 /year (ft 2 /year) or $/yearis time, yearsis the actual duration between inspections associated with the i th historical inspection record, yearsis the inspection interval, years
RISK-BASED INSPECTION METHODOLOGY, PART 5—SPECIAL EQUIPMENT 5-75Unit prodis the daily production margin on the unit, $/dayprdW c is the rated capacity of a PRD, kg/hr (lb/hr)βηη defη modη updis the Weibull shape parameteris the Weibull characteristic life parameter, yearsis the Weibull characteristic life parameter based on the default service severity chosen for aspecific PRD, yearsis the Weibull characteristic life parameter modified to account for installation factors, designfeatures, overpressure and environmental factors, yearsis the Weibull characteristic life parameter updated to account for inspection history, years
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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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2.A-2 API RECOMMENDED PRACTICE 581T
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2.A-10 API RECOMMENDED PRACTICE 581
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PART 2, ANNEX 2.BDETERMINATION OF C
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2.B.8 AMINE CORROSION .............
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CONTENTSOVERVIEW ..................
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2.C-2 API RECOMMENDED PRACTICE 581D
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2.C-6 API RECOMMENDED PRACTICE 581e
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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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3-2 API RECOMMENDED PRACTICE 581[7]
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CONTENTS3.A.1 GENERAL .............
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CONTENTS1 GENERAL………………
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3.B-2 API RECOMMENDED PRACTICE 5813
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PART 5SPECIAL EQUIPMENT5-1
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Consequence of Failure Methodology
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Page 573 and 574: RISK-BASED INSPECTION METHODOLOGY,
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API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology

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