ASTM_E_2929_-_13.pdf

Designation:E292913Standard Practice forGuided Wave Testing of Above Ground Steel Piping withMagnetostrictive Transduction1This standard is issued under the fixed designation E2929;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice provides a guide for the use of wavesgenerated using magnetostrictive transduction technology forguided wave testing(GWT)welded tubulars.Magnetostrictivematerials transduce or convert time varying magnetic fieldsinto mechanical energy.As a magnetostrictive material ismagnetized,it strains.Conversely,if an external force pro-duces a strain in a magnetostrictive material,the materialsmagnetic state will change.This bi-directional coupling be-tween the magnetic and mechanical states of a magnetostrictivematerial provides a transduction capability that can be used forboth actuation and sensing devices.1.2 GWT utilizes ultrasonic guided waves in the 10 toapproximately 250 kHz range,sent in the axial direction of thepipe,to non-destructively test pipes for discontinuities or otherfeatures by detecting changes in the cross-section or stiffness ofthe pipe,or both.1.3 GWT is a screening tool.The method does not providea direct measurement of wall thickness or the exact dimensionsof discontinuities.However,an estimate of the severity of thediscontinuity can be obtained.1.4 This practice is intended for use with tubular carbonsteel products having nominal pipe size(NPS)2 to 48corresponding to 60.3 to 1219.2 mm(2.375 to 48 in.)outerdiameter,and wall thickness between 3.81 and 25.4 mm(0.15and 1 in.).1.5 This practice only applies to GWT of basic pipeconfiguration.This includes pipes that are straight,constructedof a single pipe size and schedules,fully accessible at the testlocation,jointed by girth welds,supported by simple contactsupports and free of internal,or external coatings,or both;thepipe may be insulated or painted.1.6 This practice provides a general practice for performingthe examination.The interpretation of the guided wave dataobtained is complex and training is required to properlyperform data interpretation.1.7 This practice does not establish an acceptance criterion.Specific acceptance criteria shall be specified in the contractualagreement by the cognizant engineer.1.8 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.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.2.Referenced Documents2.1 ASTM Standards:2E543 Specification for Agencies Performing NondestructiveTestingE1065 Practice for Evaluating Characteristics of UltrasonicSearch UnitsE1316 Terminology for Nondestructive ExaminationsE1324 Guide for Measuring Some Electronic Characteristicsof Ultrasonic Testing InstrumentsE2775 Practice for Guided Wave Testing of Above GroundSteel Pipework Using Piezoelectric Effect TransductionIEEE/SI-10 American National Standard for Metric Practice2.2 Other Standards:3SNT-TC-1A Personnel Qualification and Certification inNon-Destructive Testing3.Terminology3.1 Definitions of terms specific to this standard are pro-vided in this section.Some common terms such as defect maybe referenced to Terminology E1316.3.2 Definitions of Terms Specific to This Standard:1This practice is under the jurisdiction of ASTM Committee E07 on Nonde-structive Testing and is the direct responsibility of Subcommittee E07.10 onSpecialized NDT Methods.Current edition approved June 1,2013.Published June 2013.DOI:10.1520/E2929-132For 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 fromAmerican Society for Nondestructive Testing(ASNT),P.O.Box28518,1711 Arlingate Ln.,Columbus,OH 43228-0518,http:/www.asnt.orgCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.1 circumferential extentthe length of a discontinuity inthe circumferential direction,usually given as a percentage ofthe pipe circumference.3.2.2 circumferential orientationthe circumferential posi-tion of a localized indication on the pipe,usually given as theclock position or degrees from the top circumferential positionof the pipe.3.2.3 coherent noiseindications caused by real disconti-nuities causing a background noise,which exponentially de-cays with distance(see Terminology E1316).3.2.4 cross-sectional area change(CSC)the change in thecircumfe