射线检查程序RADIOGRAPHIC EXAMINATION PROCEDURE

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1、RADIOGRAPHICEXAMINATIONPROCEDUREFORBUTTWELDSRevision0Date30/04/2017Page19of19RADIOGRAPHICEXAMINATIONPROCEDURE3210REVISIONPREPAREDBYREVIEWEDBYAPPROVEDBYAIRADIOGRAPHICEXAMINATIONPROCEDUREFORBUTTWELDSRevision0Date30/04/2017Page19of191.General1.1Thisprocedureisapplied

2、tothex-rayradiographicexaminationofweldsforpressurevesselsinaccordancewithASMECodeSectionI、SectionVandSectionⅧDivision1&2.1.2Thisprocedureisusedtodefectdiscontinuitiesinferrousweldsandwaterialwithathicknessrangebetween4mmand50.8mm.2.QualificationofExaminationPerso

3、nnel2.1Anypersonengagedintheradiographicexaminationshallbequalifiedandcertifiedasaradiographicexaminerinaccordancewith“WrittenPracticeforNDEPersonnelTraining,Examination，QualificationandCertification”2.2RadiographersshallbeatleastlevelⅠ,Radiographicinterpreterssha

4、llbeatleastlevelⅡ.3.Equipment,ToolsandMaterials3.1x-rayequipmentshallbeselectedfromTable1.Table1TypeManufactoryMax.TubeVoltage(kVp)Max.TubeCurrent(mA)Focus.Size(mm)Permittedmax.materialthickness(mm)(steel)300EG-S3RIGAKVCORPORATION30052.5×2.550250EG-S3RIGAKVCORPORA

5、TION25052.0×2.0303.2Film3.2.1FilmselectionshallbeinaccordancewithASTME-1815,StandardTestMethodforFilmSystemsforIndustrialRadiography.Theclassificationtableoffilmshallbeprovidedbythefilmmanufacturer.FilmsystemclassesSpecial,Ⅰ,Ⅱ,Ⅲ,W-A,andW-Barepermitted.RADIOGRAPHIC

6、EXAMINATIONPROCEDUREFORBUTTWELDSRevision0Date30/04/2017Page19of19Dependingonthex-raypenetrationthickness,asuitablefilmshallbeselected.Whenusingtwofilmsmethod;twodifferenttypesoffilmshallbeselected.3.2.2FilmKODAKAA400maybeused.3.3IntensifyingScreensAsuitableleadscr

7、eenshallbeselectedfromTable2.Table2TubeVoltageThicknessofleadScreen(mm)FrontBack＜150kVp0.030.03150～300kVp0.030.103.4DensitometerandStepWedgeCalibrationFilm3.4.1ThetransmissiondensitometerlistedinTable3shallbeusedforjudgingradiographdensity.Thedensitometershallbeca

8、libratedagainstthestepwedgecalibrationfilmatleastevery90daysduringusebytheNDELevelⅡorⅢExaminer,inaccordancewith“DensitometerCalibrationProcedure”.Theste