Designation:E2929−13StandardPracticeforGuidedWaveTestingofAboveGroundSteelPipingwithMagnetostrictiveTransduction1ThisstandardisissuedunderthefixeddesignationE2929;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesaguidefortheuseofwavesgeneratedusingmagnetostrictivetransductiontechnologyforguidedwavetesting(GWT)weldedtubulars.Magnetostrictivematerialstransduceorconverttimevaryingmagneticfieldsintomechanicalenergy.Asamagnetostrictivematerialismagnetized,itstrains.Conversely,ifanexternalforcepro-ducesastraininamagnetostrictivematerial,thematerial’smagneticstatewillchange.Thisbi-directionalcouplingbe-tweenthemagneticandmechanicalstatesofamagnetostrictivematerialprovidesatransductioncapabilitythatcanbeusedforbothactuationandsensingdevices.1.2GWTutilizesultrasonicguidedwavesinthe10toapproximately250kHzrange,sentintheaxialdirectionofthepipe,tonon-destructivelytestpipesfordiscontinuitiesorotherfeaturesbydetectingchangesinthecross-sectionorstiffnessofthepipe,orboth.1.3GWTisascreeningtool.Themethoddoesnotprovideadirectmeasurementofwallthicknessortheexactdimensionsofdiscontinuities.However,anestimateoftheseverityofthediscontinuitycanbeobtained.1.4Thispracticeisintendedforusewithtubularcarbonsteelproductshavingnominalpipesize(NPS)2to48correspondingto60.3to1219.2mm(2.375to48in.)outerdiameter,andwallthicknessbetween3.81and25.4mm(0.15and1in.).1.5ThispracticeonlyappliestoGWTofbasicpipeconfiguration.Thisincludespipesthatarestraight,constructedofasinglepipesizeandschedules,fullyaccessibleatthetestlocation,jointedbygirthwelds,supportedbysimplecontactsupportsandfreeofinternal,orexternalcoatings,orboth;thepipemaybeinsulatedorpainted.1.6Thispracticeprovidesageneralpracticeforperformingtheexamination.Theinterpretationoftheguidedwavedataobtainediscompl...
