ASTM_E_1139_-_E_1139M_-_12.pdf

Designation:E1139/E1139M12Standard Practice forContinuous Monitoring of Acoustic Emission from MetalPressure Boundaries1This standard is issued under the fixed designation E1139/E1139M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice provides guidelines for continuous moni-toring of acoustic emission(AE)from metal pressure bound-aries in industrial systems during operation.Examples arepressure vessels,piping,and other system components whichserve to contain system pressure.Pressure boundaries otherthan metal,such as composites,are specifically not covered bythis document.1.2 The functions of AE monitoring are to detect,locate,and characterize AE sources to provide data to evaluate theirsignificance relative to pressure boundary integrity.Thesesources are those activated during system operation,that is,nospecial stimulus is applied to produce AE.Other methods ofnondestructive testing(NDT)may be used,when the pressureboundary is accessible,to further evaluate or substantiate thesignificance of detected AE sources.1.3 UnitsThe values stated in either SI units or inch-pound units are to be regarded as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standards.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specificprecautionary statements,see Section 6.2.Referenced Documents2.1 ASTM Standards:2E543 Specification for Agencies Performing NondestructiveTestingE569 Practice for Acoustic Emission Monitoring of Struc-tures During Controlled StimulationE650 Guide for Mounting Piezoelectric Acoustic EmissionSensorsE750 Practice for Characterizing Acoustic Emission Instru-mentationE976 Guide for Determining the Reproducibility ofAcousticEmission Sensor ResponseE1316 Terminology for Nondestructive ExaminationsE2374 Guide for Acoustic Emission System PerformanceVerification2.2 Aerospace Industries Association:3NAS-410 Certification and Qualification of NondestructiveTesting Personnel2.3 Other Documents:4SNT-TC-1A Recommended Practice for NondestructiveTesting Personnel Qualification and CertificationANSI/ASNT CP-189 ASNT Standard for Qualification andCertification of Nondestructive Testing Personnel3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this practice,refer toTerminology E1316.3.2 Definitions of Terms Specific to This Standard:3.2.1 continuous monitoringthe process of monitoring apressure boundary continuously to detect acoustic emissionduring system operation and also during system shut-downtesting such as hydrostatic testing.3.2.2 raw datadata values determined directly from mea-surement of analog inputs.These could include emission countor emission event count,or both,relative time of signal arrivalat different sensors(delta time),signal rise time,peak signal1This practice is under the jurisdiction of ASTM Committee E07 on Nonde-structive Testing and is the direct responsibility of Subcommittee E07.04 onAcoustic Emission Method.Current edition approved June 15,2012.Published July 2012.Originallyapproved in 1987.Last previous edition approved in 2007 as E1193-07.DOI:10.1520/E1139-12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Aerospace Industries Association of America,Inc.(AIA),1000Wilson Blvd.,Suite 1700,Arlington,VA22209-3928,http:/www.aia-aerospace.org.4Available fromAmerican Society for Nondestructive Testing(ASNT),P.O.Box28518,1711 Arlingate Ln.,Columbus,OH 43228-0518,http:/www.asnt.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 amplitude,RMS signal level,pressure system pressure andtemperature,and the like.3.2.3 processed datadata resulting from analysis of rawdata.Included would be AE source location coordinates,AEversus time from a given source area,AE signal amplitudeversus time,and the like.4.Summary of Practice4.1 This practice describes the use of a passive monitoringsystem to detect,locate,and characterize AE sources,in orderto evaluate their significance to the integrity of metal pressureboundaries.4.2 Thepracticeprovidesguidelinesforselection,qualification,verification,and installation of th