API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
PART 1—INTRODUCTION TO RISK-BASED INSPECTION METHODOLOGY 1-32 References2.1 NormativeThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including any amendments) applies.API Recommended Practice 580, Risk-Based InspectionAPI Recommended Practice 581, Risk-Based Inspection Methodology, Part 2—Probability of FailureMethodologyAPI Recommended Practice 581, Risk-Based Inspection Methodology, Part 3—Consequence of FailureMethodology2.2 Informative[1] API Standard API-579-1/ASME FFS-1 2016, Fitness-For-Service, American Petroleum Institute,Washington, DC, 2007[2] CCPS, Guidelines for Consequence Analysis of Chemical Releases, ISBN 978-0-8169.0786-1, publishedby the Center for Chemical Process Safety of the American Institute of Chemical Engineers, 1995[3] TNO, Methods for Calculation of Physical Effects (TNO Yellow Book, Third Edition), Chapter 6: HeatFlux from Fires, CPR 14E, ISSN 0921-9633/2.10.014/9110, Servicecentrum, The Hague, 1997[4] CCPS, Guidelines for Evaluating the Characteristics of Vapor Cloud Explosions, Flash Fires, andBLEVEs, ISBN 0-8169-0474-X, published by the Center for Chemical Process Safety of the AmericanInstitute of Chemical Engineers, 1994[5] CCPS, Guidelines for Vapor Cloud Explosions, Pressure Vessel Burst, BLEVE and Flash FiresHazards, ISBN 978-0-470-25147-8, published by the Center for Chemical Process Safety of theAmerican Institute of Chemical Engineers, 2010[6] Lees, F.P., Loss Prevention in the Process Industries: Hazard Identification, Assessment and Control,Butterworth-Heinemann, Second Edition, Reprinted 2001[7] 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 SupportingResearch (OFCM) with the assistance of SCAPA members.[8] Cox, A.W., F.P. Lees, and M.L. Ang, Classification of Hazardous Locations, Institution of ChemicalEngineers, Rugby, UK, 1990. ISBN 978-08529525803 Terms, Definitions, Acronyms, and Abbreviations3.1 Terms and Definitions3.1.1aerosolLiquid droplets small enough to be entrained in a vapor stream.3.1.2atmospheric dispersion
1-4 API RECOMMENDED PRACTICE 581The low momentum mixing of a gas or vapor with air. The mixing is the result of turbulent energy exchange,which is a function of wind (mechanical eddy formation) and atmospheric temperature profile (thermal eddyformation).3.1.3autoignition temperatureAITThe lowest temperature at which a fluid mixture can ignite without a source of ignition.3.1.4boiling liquid expanding vapor explosionBLEVEAn event that occurs from the sudden release of a large mass of pressurized liquid (above the boiling point)to the atmosphere. A primary cause is an external flame impinging on the shell of a vessel above the liquidlevel, weakening the shell and resulting in sudden rupture.3.1.5business interruption costsfinancial consequenceIncludes the costs that are associated with any failure of equipment in a process plant. These include, butare not limited to, the cost of equipment repair and replacement, downtime associated with equipment repairand replacement, costs due to potential injuries associated with a failure, and environmental cleanup costs.3.1.6componentAny part that is designed and fabricated to a recognized code or standard. For example, a pressureboundary may consist of components (cylindrical shell sections, formed heads, nozzles, AST shell courses,AST bottom plate, etc.).3.1.7component typeCategory of any part of a covered equipment (see component) and is used to assign gff , calculate t min , anddevelop inspection plans.3.1.8consequenceThe outcome of an event or situation expressed qualitatively or quantitatively, being a loss, injury,disadvantage, or gain.3.1.9consequence analysisThe analysis of the expected effects of incident outcome cases independent of frequency or probability.3.1.10consequence areaThe area impacted as a result of an equipment failure using calculations defined in API 581.3.1.11consequence of failureCOFThe outcome of a failure event used in relative ranking of equipment. COF can be determined for safety,environmental, or financial events.3.1.12consequence methodologyThe consequence modeling approach that is defined in API 581.
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PART 1—INTRODUCTION TO RISK-BASED INSPECTION METHODOLOGY 1-3
2 References
2.1 Normative
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
API Recommended Practice 580, Risk-Based Inspection
API Recommended Practice 581, Risk-Based Inspection Methodology, Part 2—Probability of Failure
Methodology
API Recommended Practice 581, Risk-Based Inspection Methodology, Part 3—Consequence of Failure
Methodology
2.2 Informative
[1] API Standard API-579-1/ASME FFS-1 2016, Fitness-For-Service, American Petroleum Institute,
Washington, DC, 2007
[2] CCPS, Guidelines for Consequence Analysis of Chemical Releases, ISBN 978-0-8169.0786-1, published
by the Center for Chemical Process Safety of the American Institute of Chemical Engineers, 1995
[3] TNO, Methods for Calculation of Physical Effects (TNO Yellow Book, Third Edition), Chapter 6: Heat
Flux from Fires, CPR 14E, ISSN 0921-9633/2.10.014/9110, Servicecentrum, The Hague, 1997
[4] CCPS, Guidelines for Evaluating the Characteristics of Vapor Cloud Explosions, Flash Fires, and
BLEVEs, ISBN 0-8169-0474-X, published by the Center for Chemical Process Safety of the American
Institute of Chemical Engineers, 1994
[5] CCPS, Guidelines for Vapor Cloud Explosions, Pressure Vessel Burst, BLEVE and Flash Fires
Hazards, ISBN 978-0-470-25147-8, published by the Center for Chemical Process Safety of the
American Institute of Chemical Engineers, 2010
[6] Lees, F.P., Loss Prevention in the Process Industries: Hazard Identification, Assessment and Control,
Butterworth-Heinemann, Second Edition, Reprinted 2001
[7] 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.
[8] Cox, A.W., F.P. Lees, and M.L. Ang, Classification of Hazardous Locations, Institution of Chemical
Engineers, Rugby, UK, 1990. ISBN 978-0852952580
3 Terms, Definitions, Acronyms, and Abbreviations
3.1 Terms and Definitions
3.1.1
aerosol
Liquid droplets small enough to be entrained in a vapor stream.
3.1.2
atmospheric dispersion