A65316舱壁天花板甲板材料可燃性试验程序建议案.docx
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A65316舱壁天花板甲板材料可燃性试验程序建议案.docx
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A65316舱壁天花板甲板材料可燃性试验程序建议案
RESOLUTIONA.653(16)
Adoptedon19October1989
RECOMMENDATIONONIMPROVEDFIRETESTPROCEDURESFORSURFACEFLAMMABILITYOFBULKHEAD,CEILINGANDDECKFINISHMATERIALS
THEASSEMBLY,
RECALLINGArticle15(j)oftheConventionontheInternationalMaritimeOrganizationconcerningthefunctionsoftheAssemblyinrelationtoregulationsandguidelinesconcerningmaritimesafety,
RECALLINGFURTHERthatitadopted,byresolutionA.564(14),theRevisedRecommendationonFireTestProceduresforSurfaceFlammabilityofBulkhead,CeilingandDeckFinishMaterials,withreferencetotheterm"lowflamespread"inregulationsII-2/3.8,II-2/34.3andII-2/49.1oftheInternationalConventionfortheSafetyofLifeatSea,1974,asamended,
RECOGNIZINGtheneedtoimprovethesetestproceduresinthelightofexperiencegained,
HAVINGCONSIDEREDtherecommendationmadebytheMaritimeSafetyCommitteeatitsfifty-seventhsession,
1.ADOPTStheRecommendationonImprovedFireTestProceduresforSurfaceFlammabilityofBulkhead,CeilingandDeckFinishMaterials,thetextofwhichisannexedtothepresentresolutionandwhichsupersedestheRevisedRecommendationannexedtoresolutionA.564(14);
2.RECOMMENDSGovernmentsconcernedtoapplytheRecommendationonImprovedFireTestProceduressetoutintheAnnex,inlieuoftheRevisedRecommendationasannexedtoresolutionA.564(14)inconjunctionwiththeguidelinesontheevaluationoffirehazardpropertiesofmaterialssetoutinresolutionA.166(ES.IV).
ANNEX
RECOMMENDATIONONIMPROVEDFIRETESTPROCEDURESFORSURFACEFLAMMABILITYOFBULKHEAD,CEILINGANDDECKFINISHMATERIALS
1SCOPE
ThisRecommendationspecifiesaprocedureformeasuringfirecharacteristicsofbulkhead,ceilinganddeckfinishmaterialsasabasisforcharacterizingtheirflammabilityandthustheirsuitabilityforuseinmarineconstruction.
2WARNING
2.1Ignitionhazards
Theuseofthistestmethodinvolvesthegenerationofveryhighheatfluxlevelswhicharecapableofcausingignitionofsomematerialssuchasclothingfollowingevenbriefexposures.Precautionsshouldbetakentoavoidaccidentalignitionsofthistype.
2.2Toxicfumehazards
Theattentionoftheuserofthistestisdrawntothefactthatthefumesfromburningmaterialsoftenincludecarbonmonoxide.Othermoretoxicproductsmayinmanyinstancesbeproduced.Suitableprecautionsshouldbetakentoavoidanyextendedexposuretothesefumes.
3DEFINITIONS
CertaintermsusedinthisRecommendationrequiredefinitionforclarity.Otherfirecharacteristictermsarealsoused;thesearedefinedhereunderbutrelateonlytotheresultsofmeasurementsbythisspecifictestmethod.
3.1Compensatingthermocouple
Athermocoupleforthepurposeofgeneratinganelectricalsignalrepresentinglong-termchangesinstackmetaltemperatures.Afractionofthesignalgeneratedissubtractedfromthesignaldevelopedbythestackgasthermocouples.
3.2Criticalfluxatextinguishment
Afluxlevelatthespecimensurfacecorrespondingtothedistanceoffarthestadvanceandsubsequentself-extinguishmentoftheflameonthecentrelineofaburningspecimen.Thefluxreportedisbasedoncalibrationtestswithadummyspecimen.
3.3Dummyspecimen
Aspecimenusedforstandardizingtheoperatingconditionoftheequipment;itshouldberoughly20mmthickness,800±100kg/m2densityandshouldmeettherequirementsofresolutionA.472(XII)asnon-combustible.
3.4Specialcalibrationdummyspecimen
Adummyspecimenasdefinedbyfigure14intendedonlyforuseincalibrationofheatfluxgradientalongwithspecimen.
3.5Fumestack
Abox-likeductwiththermocouplesandbafflesthroughwhichflamesandhotfumesfromaburningspecimenpass.Itspurposeistopermitmeasurementoftheheatreleasefromtheburningspecimen.
3.6Heatforignition
Theproductofthetimefrominitialspecimenexposureuntiltheflamefrontreachesthe150mmpositionandthefluxlevelatthisposition;thislatterobtainedinpriorcalibrationoftheapparatus.
3.7Heatreleaseofspecimen
Theobservedheatreleaseunderthevariablefluxfieldimposedonthespecimenandmeasuredasdefinedbythetestmethod.
3.8Heatforsustainedburning
Theproductoftimefrominitialspecimenexposureuntilarrivaloftheflamefrontandtheincidentfluxlevelatthatsamelocationasmeasuredwithadummyspecimenduringcalibration.Thelongesttimeusedinthiscalculationshouldcorrespondtoflamearrivalatastationatleast30mmpriortothepositionoffurthestflamepropagationonthecentrelineofthespecimen.
3.9Reverberatorywires
Awiremeshlocatedinfrontof,butcloseto,theradiatingsurfaceofthepanelheatsource.Thisservestoenhancethecombustionefficiencyandincreasetheradianceofthepanel.
3.10Viewingrakes
Asetofbarswithwiresspacedat50mmintervalsforthepurposeofincreasingtheprecisionoftimingflamefrontprogressalongthespecimen.
4PRINCIPLEOFTHETEST
Thistestprovidesmethodsforevaluatingflammabilitycharacteristicsof155mm≠800mmspecimensinverticalorientation.Thespecimensareexposedtoagradedradiantfluxfieldsuppliedbyagas-firedradiantpanel.Meansareprovidedforobservingthetimestoignition,spreadandextinguishmentofflamealongthelengthofthespecimenaswellasformeasuringthecompensatedmillivoltsignalofthestackgasthermocouplesastheburningprogresses.Experimentalresultsarereportedintermsof:
heatforignition,heatforsustainedburning,criticalfluxatextinguishmentandheatreleaseofspecimenduringburning.
5FACILITYANDAPPARATUSREQUIREMENTS
5.1General
Adetaileddescriptionofthefacilityandapparatusrequiredforconductofthistestisincludedintheappendix.Compliancewiththeappendixformsanessentialrequirementofthetestmethod.Theequipmentneededmaybesummarizedasfollows:
5.1.1Specialtestroomfittedwithfumeexhaustsystemaswellasfreshairinlet.
5.1.2Radiantpanelframefittedwithblowerorothersourceofcombustionair,amethane*ornaturalgassupplysystemwithsuitablesafetycontrols,andaradiantpanelheatsource,withreverberatorywires,arrangedtoradiateonaverticalspecimen.Alternatively,anelectricallyheatedradiantsourceofthesamedimensionsmaybeusedprovideditcanexposethespecimentotheheatfluxdistributionshownintable1.Theeffectivesourcetemperatureofanyradiantpanelisnotgreaterthan1,000℃.
*Theuseofgasesotherthanmethaneornaturalgasisnotrecommendedalthoughwithchangesinpanel-specimenspacingithasbeenreportedpossibletousetheequipmentwithpropaneuptofluxlevelsof50kw/mm.
5.1.3Thespecimenholderframe,threespecimenholders,twopartsofpilotburners,specimenholderguides,viewingrakesandaviewingmirror.
5.1.4Aspecimenfumestackwithbothstackgasandstacktemperaturecompensatingthermocouplestogetherwithameansforadjustingthemagnitudeofthecompensationsignal.
5.1.5Instrumentationcomprisingachronograph,digitalorsweepsecondelectricclock,adigitalmillivoltmeter,atwo-channelmillivoltrecorder,gas-flowmeter,heat-fluxmeters,awideangletotalradiationpyrometerandastopwatch.Useofadataacquisitionsystemtorecordbothpanelradianceandtheheatreleasestacksignalduringtestwillfacilitatedatareduction.
6CALIBRATION
Mechanical,electricalandthermalcalibrationsshouldbeperformedasdescribedintheappendix.Theseadjustmentsandcalibrationsshouldbeperformedfollowinginitialinstallationoftheapparatusandatothertimesastheneedarises.
6.1Monthlyverification
Thecalibrationofthefluxdistributiononthespecimenandtheproperoperationofthefumestackwithitsthermocouplesystemshouldbeconfirmedbymonthlytests,oratmorefrequentintervalsifthisisfoundnecessary(see4.3.1and4.6intheappendix).
6.2Dailyverification
Asameansofassuringcontinuedproperadjustmentoftheapparatus,thefollowingtestsshouldbeperformedonadailybasis,ormorefrequentlyifthenatureofthespecimensmakesthisnecessary.
6.2.1Adjustmentofthepilotburner,theacetyleneandairsupplyshouldbeadjustedtoprovideaflamelengthofabout230mm*.Whenthishasbeendone,theflamelengthasviewedinadarkenedlaboratorywillbeseentoextendabout40mmabovetheupperretainingflangeofthespecimenholder.Theburnerspacingfromthespecimenisadjustedwhiletheradiantsourceisoperatingbytheuseofsoftwoodsplinesof3mmthicknessandof10mmand12mmwidth.Whenthesesplinesaremovedduringatwosecondexposurealongtheflamelength,betweenthepilotburnerflameandadummyspecimensurface,the10mmsplineshouldnotbecharredbutthe12mmsplineshouldshowchar.Withthespecimenintheverticalposition,thecharringofthe12mmsplineshouldoccuroveraverticaldistanceofatleast40mmfromtheupperexposededgeofthespecimen(seefigure9intheappendix).
*Itisrecommendedthat,togiveincreasedprecision,acetyleneratherthanothergasesbeusedwhereverpossible.
6.2.2Thestackgasthermocouplesshouldbecleanedbylightbrushingatleastdaily.Thiscleaningmayberequiredevenmorefrequently,insomeinstancesbeforeeachtest,whenmaterialsproducingheavysootcloudsaretested.Thesethermocouplesshouldalsobeindividuallycheckedforelectricalcontinuitytoensuretheexistenceofausefulthermojunction.Followingdailycleaningoftheparallelconnectedstackgasthermocouples,boththeyandthecompensatingjunctionshouldbecheckedtoverifythattheresistancebetweenthemandthestackisinexcessofohms.
6.3Continuousmonitoringofoperation
Adummyspecimenshouldremainmountedin
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