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2012_2017.pdf

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1、AN AMERICAN NATIONAL STANDARD ASME B31G-2012(Revision of ASME B31G-2009)Manual for Determining the Remaining Strength of Corroded PipelinesSupplement to ASME B31 Code for Pressure PipingREAFFIRMED 2017INTENTIONALLY LEFT BLANK ASME B31G-2012(Revision of ASME B31G-2009)Manual forDetermining theRemaini

2、ng Strength ofCorroded PipelinesSupplement to ASME B31 Code forPressure PipingAN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016 USADate of Issuance:October 24,2012The next edition of this Manual is scheduled for publication in 2015.ASMEissueswritten repliestoinquiriesconcerning interp

3、retationsoftechnicalaspectsof thisManual.Periodically certain actions of the ASME B31 Committee may be published as Code Cases.CodeCases and interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org/as they are issued.Errata to codes and standards may be p

4、osted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items,or to correct typographical or grammatical errorsin codes and standards.Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/.There is an optio

5、n available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.ThisoptioncanbefoundontheappropriateCommitteePageafterselecting“Errata”inthe“PublicationInformation”section.ASME is the registered trademark of The American Society of Mechanical Engine

6、ers.This Manual was developed under procedures accredited as meeting the criteria for American National Standards.The Standards Committee that approved the Manual was balanced to assure that individuals from competent andconcerned interests have had an opportunity to participate.The proposed Manual

7、was made available for public reviewand comment that provides an opportunity for additional public input from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position wi

8、th respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assumes any such liability.Users of a code or standard a

9、re expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry end

10、orsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in

11、 an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2012 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivC

12、ommittee Roster.vCorrespondence With the B31 Committee.viSummary of Changes.vii1Introduction.12Evaluation Methods.63Tables of Allowable Length of Corrosion.8Figures1.12-1Corrosion Pit Interaction Distances.51.13-1Helically Oriented Corrosion Pattern.52.1-1Corrosion Parameters Used in Analysis.7Table

13、s3-1Values of L for Pipe Sizes NPS 2 and NPS 6.93-1MValues of L for Pipe Sizes 60 mm and 168 mm O.D.93-2Values of L for Pipe Sizes NPS 6 and NPS 10.103-2MValues of L for Pipe Sizes 168 mm and 273 mm O.D.113-3Values of L for Pipe Sizes NPS 10 and NPS 16.123-3MValues of L for Pipe Sizes 273 mm and 406

14、 mm O.D.133-4Values of L for Pipe Sizes NPS 16 and NPS 20.143-4MValues of L for Pipe Sizes 406 mm and 508 mm O.D.153-5Values of L for Pipe Sizes NPS 20 and NPS 24.163-5MValues of L for Pipe Sizes 508 mm and 610 mm O.D.173-6Values of L for Pipe Sizes NPS 24 and NPS 30.183-6MValues of L for Pipe Sizes

15、 610 mm and 762 mm O.D.193-7Values of L for Pipe Sizes NPS 30 and NPS 36.203-7MValues of L for Pipe Sizes 762 mm and 914 mm O.D.213-8Values of L for Pipe Sizes NPS 36 and NPS 42.223-8MValues of L for Pipe Sizes 914 mm and 1 066 mm O.D.233-9Values of L for Pipe Sizes NPS 42 and NPS 48.243-9MValues of

16、 L for Pipe Sizes 1 066 mm and 1 219 mm O.D.273-10Values of L for Pipe Sizes NPS 48 and NPS 52.303-10MValues of L for Pipe Sizes 1 219 mm and 1 320 mm O.D.333-11Values of L for Pipe Sizes NPS 52 and NPS 56.363-11MValues of L for Pipe Sizes 1 320 mm and 1 422 mm O.D.393-12Values of L for Pipe Sizes NPS 56 Through NPS 60.423-12MValues of L for Pipe Sizes 1 422 mm Through 1 524 mm O.D.45iiiFOREWORDIthasbeenrecognizedwithinthepipelineindustrythatsomesectionsofhigh-pressurepipelines,particularly thos

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