_RP_581-2016_2020.pdf

Risk-Based Inspection MethodologyAPI RECOMMENDED PRACTICE 581THIRD EDITION,APRIL 2016ADDENDUM 1,APRIL 2019ADDENDUM 2,OCTOBER 2020Special NotesAPI publications necessarily address problems of a general nature.With respect to particular circumstances,local,state,and federal laws and regulations should be reviewed.Neither API nor any of APIs employees,subcontractors,consultants,committees,or other assignees make any warranty or representation,either express or implied,with respect to the accuracy,completeness,or usefulness of the information contained herein,or assume any liability or responsibility for any use,or the results of such use,of any information or process disclosed in this publication.Neither API nor any of APIs employees,subcontractors,consultants,or other assignees represent that use of this publication would not infringe upon privately owned rights.API publications may be used by anyone desiring to do so.Every effort has been made by the Institute to assure the accuracy and reliability of the data contained in them;however,the Institute makes no representation,warranty,or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any authorities having jurisdiction with which this publication may conflict.API publications are published to facilitate the broad availability of proven,sound engineering and operating practices.These publications are not intended to obviate the need for applying sound engineering judgment regarding when and where these publications should be utilized.The formulation and publication of API publications is not intended in any way to inhibit anyone from using any other practices.Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all the applicable requirements of that standard.API does not represent,warrant,or guarantee that such products do in fact conform to the applicable API standard.All rights reserved.No part of this work may be reproduced,translated,stored in a retrieval system,or transmitted by any means,electronic,mechanical,photocopying,recording,or otherwise,without prior written permission from the publisher.Contact the Publisher,API Publishing Services,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001.Copyright 2016 American Petroleum InstituteForewordNothing contained in any API publication is to be construed as granting any right,by implication or otherwise,for the manufacture,sale,or use of any method,apparatus,or product covered by letters patent.Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent.This document was produced under API standardization procedures that ensure appropriate notification and participation in the developmental process and is designated as an API standard.Questions concerning the interpretation of the content of this publication or comments and questions concerning the procedures under which this publication was developed should be directed in writing to the Director of Standards,American Petroleum Institute,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001.Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director.Generally,API standards are reviewed and revised,reaffirmed,or withdrawn at least every five years.A one-time extension of up to two years may be added to this review cycle.Status of the publication can be ascertained from the API Standards Department,telephone(202)682-8000.A catalog of API publications and materials is published annually by API,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001.Suggested revisions are invited and should be submitted to the Standards Department,API,200 Massachusetts Avenue,NW,Suite 1100,Washington,DC 20001,standardsapi.org.iiiPART 1 INTRODUCTION TO RISK-BASED INSPECTION METHODOLOGY CONTENTS 1 SCOPE.1 1.1 Purpose.1 1.2 Introduction.1 1.3 Risk Management.1 1.4 Organization and Use.2 1.5 Tables.2 2 REFERENCES.3 2.1 Normative.3 2.2 Informative.3 3 TERMS,DEFINITIONS,ACRONYMS,AND ABBREVIATIONS.3 3.1 Terms and Definitions.3 3.2 Acronyms and Abbreviations.11 4 BASIC CONCEPTS.16 4.1 Probability of Failure(POF).16 4.1.1 Overview.16 4.1.2 GFF Method.16 4.1.3 Two-parameter Weibull Distribution Method.17 4.2 Consequence of Failure(COF).17 4.2.1 Overview.17 4.2.2 Level 1 COF.18 4.2.3 Level 2 COF.19 4.3 Risk Analysis.20 4.3.1 Determination of Risk.20 4.3.2 Risk Plotting.21 4.3.2.3 Iso-Risk Plot Example.21 4.3.3 General Comments Concerning Risk Plotting.22 4.4 Inspection Planning Based on Risk Analysis.22 4.4.1 Overview.22 4.4.2 Targets.23 4.4.3 Inspection EffectivenessThe Value of Inspection.24 4.4.4 Inspection Planning.24 4.5 Nomenclature.24 4.6 Tables.26 4.7 Figures.27 1-1PART 1Introduction to