ISO 16809 2025.docx

Z5XISOInternationalStandardISO16809Thirdedition2025-06Non-destructivetesting一UltrasonicthicknessdeterminationEssaisnondestructifsDeterminationdeUepaisseurparultrasonsReferencenumberISO16809:2025(en)COPYRIGHTPROTECTEDDOCUMENT©ISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandContentsPageForewordv1 Scope12 Normativereferences13 Termsanddefinitions14 Modesofdetermination15 Generalrequirements35.1 Ultrasonicinstruments35.2 Probes35.3 Couplant35.4 Referenceblocks45.5 Testobjects45.6 Qualificationoftestpersonnel46 Applicationofthetechniques46.1 Surfaceconditionandsurfacepreparation46.2 Technique56.2.1 General56.2.2 Determinationduringmanufacture56.2.3 Determinationofresidualwallthicknessinservice66.3 Selectionofprobe66.4 Selectionofultrasonicinstrument.76.5 Specialtestconditions76.5.1 General.76.5.2 Materialsdifferentfromthematerialofthereferenceblock76.5.3 Determinationattemperaturesbelow076.5.4 Determinationatelevatedtemperatures86.5.5 Hazardousatmospheres87 Instrumentsetting87.1 General87.2 Methodsofsetting87.2.1 General87.2.2 Ultrasonicinstrumentswithnumericaldisplay97.2.3 UltrasonicinstrumentswithA-scanpresentation97.3 Checksofsettings108 Influenceonaccuracy118.1 Operationalconditions118.1.1 Surfaceconditions118.1.2 Temperatureofthetestobject118.1.3 Metalliccoating118.1.4 Non-metalliccoating128.1.5 Geometry138.1.6 Materialhomogeneity138.2 Testequipment148.2.1 Resolution148.2.2 Range148.3 Evaluationofaccuracy158.3.1 General158.3.2 Influencingparameters158.3.3 Methodofcalculation.159 Influenceofmaterials159.1 General159.2 Inhomogeneity159.3 Anisotropy159.4 Soundattenuation159.5 Surfaceconditions169.5.1 General169.5.2 Testsurface169.5.3 Reflectingsurface169.5.4 Corrosionanderosion1710 Testreport1710.1 General1710.2 Generalinformation1710.3 Testresults18Annex A (informative)Corrosioninvesselsandpiping19Annex B (informative)Instrumentsettings24Annex C (informative)Parametersinfluencingaccuracy27Annex D (informative)Selectionoftechniqueforthicknessdetermination31Bibliography34ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seeWWW.iso.org/directives).ISOdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof（八）patent(三).ISOtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespectthereof.Asofthedateofpublicationofthisdocument,ISOhadnotreceivednoticeof（八）patent(三)whichmayberequiredtoimplementthisdocument.HoweverlImplementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableatWWW.iso.org/patents.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationofthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISO'sadherencetotheWorldTradeOrganization(WTO)principlesintheTechnicalBarrierstoTrade(TBT),seeWWW.iso.org/iso/foreword.htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC135,Non-destructivetesting,SubcommitteeSC3,Ultrasonictesting,incollaborationwiththeEuropeanCommitteeforStandardization(CEN)TechnicalCommitteeCEN/TC138,Non-destructivetesting,inaccordancewiththeAgreementontechnicalcooperationbetweenISOandCEN(ViennaAgreement).Thisthirdeditioncancelsandreplacesthesecondedition(ISO16809:2017),whichhasbeentechnicallyrevised.Themainchangesareas