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

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3.A.5.6 Determination of Flammable and Explosive Consequences .............................................. 253.A.5.7 Determination of Toxic Consequences ................................................................................. 253.A.5.8 Determination of Environmental Consequences ................................................................. 253.A.5.9 Tables ....................................................................................................................................... 26
Risk-Based Inspection MethodologyPart 3—Consequence of Failure MethodologyAnnex 3.A—Basis for Consequence Methodology3.A.1 GeneralThe consequence analysis is performed to aid in establishing a relative ranking of equipment items on thebasis of risk. The consequence methodologies presented in Part 3 of this document are intended assimplified methods for establishing relative priorities for inspection programs. If more accurate consequenceestimates are needed, the analyst should refer to more rigorous analysis techniques, such as those used inquantitative risk analysis.This Annex provides background and supplemental information to the specific procedures for conducting theconsequence analysis provided in Part 3.3.A.2 ReferencesAPI Recommended Practice 581, Risk-Based Inspection Methodology, Part 1—Inspection PlanningMethodology, American Petroleum Institute, Washington, DC.API Recommended Practice 581, Risk-Based Inspection Methodology, Part 3—Consequence of FailureMethodology, American Petroleum Institute, Washington, DC.API, A Survey of API Members’ Aboveground Storage Tank Facilities, 1994.OFCM, Directory of Atmospheric Transport and Diffusion Consequence Assessment Models (FC-I3-1999),published by the Office of the Federal Coordinator for Meteorological Services and Supporting Research(OFCM) with the assistance of SCAPA members.3.A.3 Level 1 Consequence Methodology3.A.3.1 Representative Fluid and Associated Properties3.A.3.1.1OverviewIn the Level 1 consequence analysis, a representative fluid that most closely matches the fluid contained inthe pressurized system being evaluated is selected from the representative fluids shown in Table 3.A.3.1.Because very few refinery and chemical plant streams are pure materials, the selection of a representativefluid involves making assumptions. The assumptions and the sensitivity of the results are dependent on thetype of consequences being evaluated. If assumptions are not valid or the fluid in question is not properlyrepresented by the fluids provided in Table 3.A.3.1, a Level 2 consequence analysis is recommended usingthe methodology in Part 3, Section 5.3.A.3.1.23.A.3.1.2.1Choice of Representative Fluids for MixturesGeneralFor mixtures, the choice of the representative material should primarily be based on the normal boiling pointand the molecular weight, and secondly on the density. If these values are unknown, an estimated propertyvalue for the mixture can be calculated using Equation (3.A.1) to assist in representative fluid selection usingmole fraction weighting.∑Property = x ⋅ Propertymix i i(3.A.1)3.A-1
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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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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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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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Page 513: CONTENTS3.A.1 GENERAL .............
Page 517 and 518: RISK-BASED INSPECTION METHODOLOGY,
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Page 547 and 548: PART 5SPECIAL EQUIPMENT5-1
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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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