1、A Referencenumbe r ISO80072:1999 (E) INTERNATIONAL STANDARD ISO 80072 Firstedition 19990801 Carbonaceousmaterialsusedinthe productionofaluminiumSamplingplans andsamplingfromindividualunits Part2: Prebakedanodes ProduitscarbonsutilisspourlaproductiondelaluminiumPlans dchantillonnageetchantillonnagepo
2、urunitsindividuelles Partie2:AnodesprcuitesISO80072:1999(E) ISO1999 Allrightsreserved.Unlessotherwisespecified,nopartofthispublicationmaybereproduced orutilizedinanyformorbyanymeans,electronicormechanical,includingphotocopyingand microfilm,withoutpermissioninwritingfromthepublisher. InternationalOrg
3、anizationforStandardization Casepostale56 CH1211Genve20 Switzerland Internet isoiso.ch PrintedinSwitzerland ii Contents 1Scope 1 2Normativereferences . .1 3Definitions 1 4Samplingplansforlargeconsignmentsorforbatches . .1 4.1General .1 4.2Singleunitofproduct. 2 4.3Drawingupasamplingplanbasedonaccept
4、ablequalitylevel(AQL). 2 4.4Operatingthesamplingplanbasedonacceptablequalitylevel(AQL) 2 4.5Drawingupasamplingplanbasedonaveragetestvalues .6 5Takingtestsamplesfromindividualanodes. .6 5.1Procedure 6 5.2Dimensionsoftestsamples . .6 5.3Samplingpoints 6 6Samplingreport .9 AnnexA (informative) Examples
5、11ISO ISO80072:1999(E) iii Foreword ISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISO memberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnical committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcomm
6、itteehasbeenestablishedhas therighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnongovernmental,in liaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnical Commission(IEC)onallmattersofelectrotechnicalstandardization. InternationalSt
7、andardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part3. DraftInternationalStandardsadoptedbythetechnicalcommitteesarecirculatedtothememberbodiesforvoting. PublicationasanInternationalStandardrequiresapprovalbyatleast75%ofthememberbodiescastingavote. InternationalStandardISO80072w
8、aspreparedbyTechnicalCommittee,ISO/TC47, Chemistry,Subcommittee SC7,Aluminiumoxide,cryolite,aluminiumfluoride,sodiumfluoride,carbonaceousproductsforthealuminium industry. ISO8007consistsofthefollowingparts,underthegeneraltitle, Carbonaceousmaterialsusedintheproductionof aluminiumSamplingplansandsamp
9、lingfromindividualunits: Part1:Cathodeblocks Part2:Prebakedanodes Part3,whichisinpreparation,willgiveproceduresforsamplingsidewallblocks. AnnexAofthispartofISO8007isforinformationonly.INTERNATIONALSTANDARD ISO ISO80072:1999(E) 1 Carbonaceousmaterialsusedintheproductionofaluminium Samplingplansandsam
10、plingfromindividualunits Part2: Prebakedanodes 1Scope ThispartofISO8007specifiesproceduresforthecreationandexecutionofasamplingplanforprebakedanodes fromalargeconsignmentorfromabatch. NOTE Theterm“batch“canbesubstitutedbytheterm“lot“ifdesired. ThispartofISO8007alsospecifiesthepreferredlocationsforta
11、kingtestsamplesfromindividualanodes. Cathodeblocksandprebakedanodesareconsideredseparately.Proceduresforsamplingcathodeblocksare giveninISO80071. Foradviceonsafety,thereaderisreferredtoISO3165:1976, Samplingofchemicalproductsforindustrialuse Safetyinsampling. 2Normative references Thefollowingnormat
12、ivedocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthis partofISO8007.Fordatedreferences,subsequentamendmentsto,orrevisionsof,anyofthesepublicationsdonot apply.However,partiestoagreementsbasedonthispartofISO8007areencouragedtoinvestigatethepossibilityof applyingthemo
13、strecenteditionsofthenormativedocumentsindicatedbelow.Forundatedreferences,thelatest editionofthenormativedocumentreferredtoapplies.MembersofISOandIECmaintainregistersofcurrentlyvalid InternationalStandards. ISO3534(allparts), StatisticsVocabularyandsymbols . ISO5022:1979, ShapedrefractoryproductsSa
14、mplingandacceptancetesting. 3Definitions ForthepurposesofthispartofISO8007,thedefinitionsgiveninISO3534(allparts)andISO5022apply. 4 Samplingplansforlargeconsignmentsorforbatches 4.1General Thesamplingplanmaybedefinedintermsofanacceptablequalitylevel(AQL).Itmaybeappliedwhentheparties concernedhaveagr
15、eedtodosoandhavetherefore,bycommonconsent,madeachoicebetweenthevarious optionsdescribedinthispartofISO8007.Thepartiesshallalsoagreeonthevariouspropertiestobemeasured (forexample,densityandelectricalresistivity)sothatthesamplingplanissuitableforitsultimatepurposeof providingrepresentativesamplesforsu
16、bsequenttesting.ISO80072:1999(E) ISO 2 ItisalsopossibletoapplytheproceduresgiveninthispartofISO8007whilemodifying,byprioragreement betweenthepartiesconcerned,therecommendedvaluesgiveninthesamplingplans(seeTables1,2,3and4). Theefficiencyofasamplingplandependssolelyonthenumberofsampledunits, n,whateve
17、rthesizeofthebatch, N,providedthat n/Nislessthan10%.Tables1,2,3and4shallbeusedtodetermine,onthebasisoftherequired efficiency,whatthesamplesize, n,shallbe. Ifexperienceshowsthatthequalityofthemanufacturersproductioncorrespondstotheagreements,itispossible, whenbatchesofthesamequalityarefrequentlysubje
18、ctedtoacceptanceprocedures,thataplanwithlower efficiencybechosen.Thiswouldimplytheuseofasmallersamplesize, n. Iflaterexperienceshowsthatthequalityofproductionfailstocorrespondtotheagreementswhenjudgedagainst presetcriteria,thenitisnecessarytoreturntotheoriginal,higherefficiency,samplingplan. Alterna
19、tively,asamplingplanmaybedefinedintermsofaveragetestvaluestogetherwithalimitationontherange oftestvaluesinsteadof,orinadditionto,acceptablequalitylevels(AQLs). Statisticalprocesscontrol(SPC)orstatisticalqualitycontrol(SQC)chartsarerecommendedtoolswhenoperating thesamplingplan. 4.2 Singleunitofproduc
20、t Thesingleunitofproductshallbeagreedbetweensellerandbuyer.Itmaybeasingleprebakedanodeoritmaybe 1tofanodes. 4.3 Drawingupasamplingplanbasedonacceptablequalitylevel(AQL) Beforethesamplingplancanbedrawnupfromthetables,itisnecessarytoagreeontheparametersgivenbelow: a) Theacceptablequalitylevel,i.e.thet
21、hepoorestqualitythatcanbeconsideredacceptableastheprocess average. b) Whethernormalortightenedinspectionistobeused.Thisisdecidedbystudyingthesamplingresultsforthe lastfewbatches.Therulesforswitchingfromonekindofinspectiontoanotheraregivenin4.5.2. c) Thebatchsize,whichmaybetheamountproducedinaproduct
22、ionbatch(orlot)or,preferably,theamount producedorreceivedinaonemonthtimeperiod. 4.4 Operatingthesamplingplanbasedonacceptablequalitylevel(AQL) 4.4.1 Table1givessuitablevaluesforthethreeparametersdescribedin4.3.Buyerandsellermayreplacethe recommendedvalueswiththeirownvaluesifrequired.Thisshallbeinclu
23、dedinthesamplingreportsee6 c). Table1Recommendedvaluesforoperatingthesamplingplan Acceptablequalitylevel(AQL) 2,5 Normalortightenedinspection Normal Batchsize Tonnespermonthofproduction or numberofunitsofproductinbatchorlot 4.4.2 RefertoTable2and,usingtheagreedvaluesfromTable1,findthecorrectsamplesi
24、zecodeletter(SSCL).ISO ISO80072:1999(E) 3 Table2Samplesizecodeletter Lotorbatchsize Samplesizecodeletter (seeTables3and4) 2to8 A 9to15 B 16to25 B 26to50 C 51to90 C 91to150 D 151to280 E 281to500 F 501to1 200 G 1201to3 200 H 3201to10 000 J 10001to35 000 K 35001to150 000 L 1500001to500 000 M 500001ando
25、ver N 4.4.2.1 Ifthequalitycontrolorqualityassuranceplanisbeingoperatedbyacceptancenumber(Ac)andrejection number(Re)fortheacceptanceorrejectionofabatch,refertoTable3andusetheSSCLandAQLvaluestoobtain theacceptanceandrejectionnumber. 4.4.2.2 Ifthesamplingplanisbeingoperatedontightenedsampling,thenrefer
26、toTable4togettheacceptance number(Ac)andrejectionnumber(Re)values. 4.4.2.3 Theacceptabilityofabatchisdeterminedbytestingthesamplesobtainedinaccordancewiththeagreed samplingplan.Ifthenumberofdefectiveunits,orthetonnageofdefectiveunits,foundinthesamplepopulationis equaltoorlessthantheacceptancenumber(
27、Ac),thenthebatchshallbeconsideredacceptable.Ifthenumberof defectivesisequaltoorgreaterthantherejectionnumber(Re),thenthebatchshallberejectedasnonconforming. NOTE1 Inthiscase,itisstronglyrecommendedthatthebuyerandsellerdiscussanactionplan.Therecommendedaction planistodividetheoriginalbatchorconsignme
28、ntintotwoormoresmallerbatchesorconsignments.Eachoftheseshouldbe sampledinaccordancewiththispartofISO8007andthenreexamined.Theobjectiveistominimizethenumberofanodes whichhavetoberejected. NOTE2 Itisstronglyrecommendedthatitisagreedinadvancehowtheextraexpensearisingfromanyresamplingandre testingisdivi
29、dedbetweensellerandbuyer.An80:20apportionmentmaybeconsideredappropriate. Thewords“defectiveunit“shallapplytoanyunitwhichgivesavalueinacontractualspecificationtestwhichis outsidetheagreedrangeofacceptability.Formostpurposes,theacceptabilityrangeisdefinedintermsofa maximumvalue,oraminimumvalue,orboth.
30、ISO80072:1999(E) ISO 4 Table3Samplingplansfornormalinspection(mastertable) NORMALISO ISO80072:1999(E) 5 Table4Samplingplansfortightenedinspection(mastertable) TIGHTENEDISO80072:1999(E) ISO 6 4.5 Drawingupasamplingplanbasedonaveragetestvalues 4.5.1 Ifthequalitycontrolorqualityassuranceplanistobeopera
31、tedonthebasisofaveragetestvaluesfora representativesample,thenthefirsttwocolumnsofTable3givethesamplesizeifnormalinspectionistobeused todeterminethenumberofunits(anodes)tobesampled.Iftightenedinspectionistobeused,thenthefirsttwo columnsofTable4apply. 4.5.2 Switchingbetweennormalandtightenedinspectio
32、nshallbecarriedoutasfollows: 4.5.2.1 Normalinspectionshallbeusedatthestartofinspectionunlessotherwiseagreedbybothparties. 4.5.2.2 Whennormalinspectionisbeingused,tightenedinspectionshallbeinstitutediftwooutoffiveconsecutive batcheshavebeendeterminednottobeacceptableaccordingtothesamplingplan. 4.5.2.
33、3 Whentightenedinspectionisbeingused,normalinspectionshallbeinstitutediffiveconsecutivebatches havebeendeterminedtobeacceptableaccordingtothesamplingplan. 5 Takingtestsamplesfromindividualanodes 5.1Procedure Usingsuitablecoredrillingorsawingequipmentwithcuttingedgespreferablycoatedwithdiamondoranoth
34、er extremelyhardmaterial,taketestsamplesinaccordancewith5.2and5.3. 5.2 Dimensionsoftestsamples Choosethedimensionsofeachtestsampleaccordingtothetesttobecarriedout.RefertotheInternati onal Standardsrelatingtotheteststobecarriedouttoensurethatthesamplestakenfromtheanodeareofsuitable dimensions. NOTE I
35、ftherearenoinstructionsintherelevantInternationalStandards,thenthefollowingguidelinesshouldbefollowed: a) Samplesofcircularcrosssectionarepreferred.Asamplediameterof50mmisrecommended. b) Thesmallestdimensionofthesampleshouldbethreetimesthemaximumparticlesizeofthedryaggregate. c) Thelengthofthesample
36、shouldbeatleast1,5timesthediameterforsamplesofcircularcrosssectionand1,5timesthe diagonalifthesamplehasasquarecrosssection. Thetestsamplestakenfromtheanodemayalreadybeofthecorrectdimensions.Ifnot,theyshallenabletest piecestobecoredrilledorsawnorturnedonalathefromthetestsamplewithatoleranceof0,1mm.Th
37、e dimensionsofthetestsamplesshallbesufficienttoallowtestpieceswithparallelsidestobeprepared. Reportthedimensionsofthetestsamplestakenandthelocationsofthesamplingpointsinthesamplingreportsee item6 d). 5.3Sampling points Figure1shows,inprinciple,thelocationsofsamplingpointsandthedirectionofsamplingfor
38、differentsizesand designsofanodeblock. Theapplicationofthesamplingprocedureshallnotcause,asfarasispossible,contamination,weakeningor destructionoftheanodeblock.ISO ISO80072:1999(E) 7 Key 1 150mmmin. 2 Diameter50mm(or30mm) 3 Length250mmor260mm a)Anodeswithonestubhole Figure1Examplesofthelocationsandt
39、hedirectionofsamplingfordifferentsizesanddesignsof anodeblocks (seealsonexttwopages)ISO80072:1999(E) ISO 8 Key 1 150mmmin. 2 Diameter50mm(or30mm) 3 Length250mmor260mm b)Anodeswiththreestubholes Figure1 (continued)ISO ISO80072:1999(E) 9 Key 1 150mmmin. 2 Diameter50mm(or30mm) 3 Length250mmor260mm c)An
40、odeswithfourstubholes Figure1 (concluded) 6Sampling report Thesamplingreportshallcontainthefollowinginformation: a) thenamesoftheproducerandcustomer; b) identificationofthebatchorconsignmentsampled; c) areferencetothispartofISO8007,i.e.ISO80072,andtotheInternationalStandardsdescribingtheteststo beca
41、rriedoutonthetestsamples; d) thedateandplaceofsampling; e) thesamplingplan(see4.3,4.4and4.5),including: 1) theAQL,ifsamplingwasbyacceptablequalitylevel, 2) whethernormalortightenedinspectionwasused,ISO80072:1999(E) ISO 10 3) thebatchorconsignmentsizeandthenumberofsamplestaken; f) forsamplingofindivi
42、dualanodes: 1) alldetailsnecessarytoidentifythesample, 2) anyidentificationmarkonthesample, 3) theprocedureusedforsampling(coredrillingorsawing), 4) asketchshowingthelocationofthesamplingpointsandthedirectionofsampling(verticalorhorizontal), NOTE ExamplesaregiveninFigure1. 5) thedimensionsofthetestsamplestaken; g) detailsofanyunusualfeaturesnotedduringsampling; h) detailsofanyproceduresoroperationsnotincludedinthis
