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6/17/2015 RadiographicTestingProcedure

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RadiographicTestingProcedureThiscontentprovidesyouwithaexampleRadiographicTestingProcedure.ThisisageneralandsampleRTprocedureandyouneedtomodifyittomeetyourprojectspecifications.

1.SCOPE:

1.1This Procedure describes the general requirements for radiographyexamination (RT) according to related approvedweldmap for themetallicweldingandcastingasmayberequiredbythespecificationorunderwhichcomponentisbeingdesignedandmanufactured.

1.2This radiographic testing procedure provides the material, equipment,calibration,personnelqualification,examinationprocess,evaluation,recordsandacceptancestandardsforXXXProjectwhichwillbefabricatedinYYY.

2.SURFACECONDITION

According toT.222.2, theweld ripplesorweldsurface irregularitieson theboth the inside (where accessible) and out side shall be removed by anysuitable process to such a degree that the resulting radiographic testingimageduetoanysurfaceirregularitiescannotmaskorbeconfusedwiththeimageofanydiscontinuity.thefinishedsurfaceofallbuttweldedjointsmatbeflushwiththebasematerialormayhavereasonablyuniformcrowns,withreinforcementnottoexceedthatspecifiedinthereferencingcodesection.

3.RADIATIONSOURCE

3.1XRadiation:

The radiography testing techniques shall demonstrate that the requiredradiography sensitivity has been obtained. Maximum xray voltage is 300KV.

3.2Gammaradiation:

TherecommendedminimumthicknessforwhichRadioactiveisotopesmaybeusedasfollow:

Table3.2

Material Iridium192 Cobalt60

Steel 0.75in 1.50in

Copperorhighnickelcopper 0.65in 1.30in

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Aluminum 2.50in

Themaximumthickness for theuseof radioactive isotopes isprimarilydictatedby exposure time, therefore upper limits are not shown. The minimumRecommended thickness limitation may be reduced when the radiographytechniques are used to demonstrate that the required radiographic testingsensitivityhavebeenobtained,bypurchaserapproval.

4.RADIGRAPHICFILMS

Any commercially available industrial radiography films may be used inaccordance with SE 1815(ASTM) standard test method for film system inindustrial radiography.Radiography film shall be fine grain high definition, highcontrastfilm(KodaktypeAA400,FUJI100orAGFAD7).

5.SCREENS

Any commercially available intensifying screen, except those of the fluorescenttype,maybeused.IntensifyingscreenforxrayorGamaraymethoddividedintwocategories:1frontscreen2backscreen.Commonly leadscreensusewith27micronthickness.(Frontscreen)

6.PENETRAMETER(I.Q.I)

Penetrameters shall be either the whole type or the wire type and shall bemanufacturedand identified inaccordancewith therequirementsoralternativesallowedinSE142orSE1025(forwholetype)andSE747(forwiretype),andappending.ASMEV2007ED&ASMESecVIIIDivIED2007.

Penetrameters shall consist of those in table 233.1 for hole type and those intable233.2forwiretype.(WiretypeIQIshallbeusedforwelds.)

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7.SELECTIONOFPENETRAMETER(I.Q.I)

7.1.Material. IQIs shall be selected from either the same alloy materialgrouporgradeasidentifiedinSE1025,orSE747,asapplicable,orfromanalloymaterialGrouporgradewithlessradiationabsorptionthanthematerialbeingradiographed.

7.2Size. The designated hole IQI or essential wire listed in Table T276providedanequivalentIQIsensitivityismaintained.SeeT283.2.shallbeasspecified in Table T276. A thinner or thicker holetype IQI may besubstitutedforanysectionthickness

(a)WeldsWithReinforcements.ThethicknessonwhichtheIQIisbasedisthenominalsinglewallthicknessplustheestimatedweldreinforcementnottoexceedthemaximumpermittedbythereferencingCodeSection.Backingrings or strips shall not be considered as part of the thickness in IQIselection.Theactualmeasurementoftheweldreinforcementisnotrequired.

(b)WeldsWithoutReinforcements.ThethicknessonwhichtheIQIisbasedis the nominal singlewall thickness. Backing rings or strips shall not beconsideredaspartoftheweldthicknessinIQIselection.

7.3Welds JoiningDissimilarMaterials orWeldswithDissimilar FillerMetal.Whentheweldmetalisofanalloygrouporgradethathasaradiationattenuation that differs from the base material, the IQI material selectionshallbebasedontheweldmetalandbeinaccordancewithT276.1.WhenthedensitylimitsofT282.2cannotbemetwithoneIQIandtheexceptionaldensity area is at the interface of theweldmetal and the basemetal, thematerialselectionfortheadditionalIQIsshallbebasedonthebasematerialandisinaccordancewithT276.1



8.PLACEMENTOFRADIOGRAPHICTESTINGPENETRAMETER(I.Q.I)

8.1Sourcesidepenetrameters:

The penetrameters shall be placed on the source side of the part beingexamined,exceptfortheconditiondescribedinchapter8.2.

8.2filmsidepenetrameters:

Sensitivity:

ThesensitivityrequiredusingwiretypeIQIshallbe2%.

Sensitivity:(Diameterofthinnestwirevisibleonradiograph/PartthicknessatIQIlocation)x100

Where inaccessibility prevents hand placing the penetrameter (s) on thesourceside,itshallbeplacedonthefilmsideincontactwiththepartbeingexamined. A lead letter F shall be placed adjacent to or on thepenetrameter(s).

9.NUMBEROFPENETRAMETER(I.Q.I)

When one or more film holders are used for an exposure, ate least one