ASTM_E_1888_-_E_1888M_-_12.pdf

Designation:E1888/E1888M12Standard Practice forAcoustic Emission Examination of Pressurized ContainersMade of Fiberglass Reinforced Plastic with Balsa WoodCores1This standard is issued under the fixed designation E1888/E1888M;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 covers guidelines for acoustic emission(AE)examinations of pressurized containers made of fiberglassreinforced plastic(FRP)with balsa cores.Containers of thistype are commonly used on tank trailers for the transport ofhazardous chemicals.1.2 This practice is limited to cylindrical shape containers,0.5 m 20 in.to 3 m 120 in.in diameter,of sandwichconstruction with balsa wood core and over 30%glass(byweight)FRP skins.Reinforcing material may be mat,roving,cloth,unidirectional layers,or a combination thereof.There isno restriction with regard to fabrication technique or method ofdesign.1.3 This practice is limited to containers that are designedfor less than 0.520 MPa 75.4 psi(gage)above static pressurehead due to contents.1.4 This practice does not specify a time interval betweenexaminations for re-qualification of a pressure container.1.5 This practice is used to determine if a container issuitable for service or if follow-up NDT is needed before thatdetermination can be made.1.6 Containers that operate with a vacuum are not within thescope of this practice.1.7 Repair procedures are not within the scope of thispractice.1.8 The values stated in either SI units or inch-pound unitsare to be regarded separately 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 standard.1.9 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.Specific precau-tionary statements are given in Section 8.2.Referenced Documents2.1 ASTM Standards:2E543 Specification for Agencies Performing NondestructiveTestingE750 Practice for Characterizing Acoustic Emission Instru-mentationE976 Guide for Determining the Reproducibility ofAcousticEmission Sensor ResponseE1067 Practice forAcoustic Emission Examination of Fiber-glass Reinforced Plastic Resin(FRP)Tanks/VesselsE1316 Terminology for Nondestructive ExaminationsE2374 Guide for Acoustic Emission System PerformanceVerification2.2 SPI/CARP Standards:3Recommended Practice for Acoustic Emission Testing ofFiberglass Reinforced Plastic Resin(FRP)Tanks/VesselsRecommended Practice for Acoustic Emission Testing ofFiberglass Reinforced Plastic Piping Systems2.3 ANSI/ASNT Standards:4SNT-TC-1A Recommended Practice for Personnel Qualifi-cation and Certification in Nondestructive TestingANSI/ASNT CP-189 Standard for Qualification and Certifi-cation of NDT Personnel1This 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 1997.Last previous edition approved in 2007 as E1888/E1888M-07.DOI:10.1520/E1888_E1888M-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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.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 2.4 AIA Standard:NAS-410 Nondestructive Testing Personnel Qualificationand Certification52.5 ASME Standard:Section V,Article 11,Boiler and Pressure Vessel Code63.Terminology3.1 DefinitionsWith the exception of terms defined in 3.2,this practice incorporates by reference all terminology inTerminology E1316 and Practice E1067.First occurrences ofterms defined herein are italicized.3.2 Definitions of Terms Specific to This Standard:3.2.1 AE trend numbera number used to designate trendsin AE activity which are exhibited by structures during a set ofrepeated loading cycles(see 9.2).3.2.2 Minimum AE activity levelthat level of activitybelow whichAE trend numbers are not robust indicators of thetrend(see 9.1)3.2.3 Examination pressurethe highest p