API RP 581 - 3rd Ed.2016 - Add.2-2020 - Risk-Based Inspection Methodology
PART 1INTRODUCTION TO RISK-BASED INSPECTION METHODOLOGY
CONTENTS1 SCOPE .................................................................................................................................................... 11.1 Purpose .......................................................................................................................................... 11.2 Introduction .................................................................................................................................... 11.3 Risk Management .......................................................................................................................... 11.4 Organization and Use.................................................................................................................... 21.5 Tables ............................................................................................................................................. 22 REFERENCES ........................................................................................................................................ 32.1 Normative ....................................................................................................................................... 32.2 Informative ..................................................................................................................................... 33 TERMS, DEFINITIONS, ACRONYMS, AND ABBREVIATIONS ........................................................... 33.1 Terms and Definitions ................................................................................................................... 33.2 Acronyms and Abbreviations ...................................................................................................... 114 BASIC CONCEPTS ................................................................................................................................ 164.1 Probability of Failure (POF).......................................................................................................... 164.1.1 Overview ................................................................................................................................. 164.1.2 GFF Method ............................................................................................................................ 164.1.3 Two-parameter Weibull Distribution Method ...................................................................... 174.2 Consequence of Failure (COF)..................................................................................................... 174.2.1 Overview ................................................................................................................................. 174.2.2 Level 1 COF ............................................................................................................................ 184.2.3 Level 2 COF ............................................................................................................................ 194.3 Risk Analysis ................................................................................................................................. 204.3.1 Determination of Risk............................................................................................................ 204.3.2 Risk Plotting ........................................................................................................................... 214.3.2.3 Iso-Risk Plot Example ........................................................................................................... 214.3.3 General Comments Concerning Risk Plotting ................................................................... 224.4 Inspection Planning Based on Risk Analysis ............................................................................ 224.4.1 Overview ................................................................................................................................. 224.4.2 Targets .................................................................................................................................... 234.4.3 Inspection Effectiveness—The Value of Inspection .......................................................... 244.4.4 Inspection Planning............................................................................................................... 244.5 Nomenclature ................................................................................................................................. 244.6 Tables ............................................................................................................................................. 264.7 Figures ............................................................................................................................................ 27
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PART 1
INTRODUCTION TO RISK-BASED INSPECTION METHODOLOGY