(3.3.2)-任务3.2.1闪点的测定（闭口杯法）

Task3.2.1DeterminationofflashandfirepointsClosedflashpointClosedcupmethodismostlyusedforlightoil,suchassolventoil,kerosene,etc.Sincethemeasurementconditionsaresimilartotheactualstorageanduseconditionsoflightoil,itcanbeusedasthebasisforfiresafetycontrolindex.FlashpointoftheopenOpencupmethodismostlyusedforlubricatingoilandheavyoil.Theycontainfewlightcomponents,andevenifthereisasmallamountoflightcomponentsmixedin,theywillevaporateduringuseandwillnotcauseafireorexplosionhazard.Dependingonthenatureofthepetroleumproductandtheconditionsofusethemethodofdeterminingtheflashpointcanbedividedinto:Purpose：1.Checkthewidthofthelubricatingoilfractionwiththedifferencebetweenthetwo,andwhetherornotlightoilsareadded;2.Detectingwhetherthelubricatingoilwillbeusedintheclosedcontainerduetovariousreasons(suchashighspeedorotherreasonstocauseequipmentoverheating,currentshortcircuit,arceffect,etc.)andhightemperature,decomposition,oradulterationintolightoilcomponentsfromotherparts,theselightcomponentsevaporateandgatherintheclosedvesselandmixwithair,thereisthedangeroffireorexplosion.Ifonlyopencupflashpoint,itisnoteasytofindtheexistenceoflightoilcomponents,soyouhavetopassthroughtheopencupflashpointandclosedcupflashpointtwodata,todeterminethequalityorriskoftheoil.Opencupandclosedcupflashpointbothtodo:Alloyedoil“Listentobothsidesandyouwillbeenlightened,heedonlyonesideandyouwillbebenighted”I.Closedcupflashpoint1.TestmethodstandardGB/T261-2008"Determinationofflashpoint.Pensky-Martensclosedcupmethod"2.ScopeofuseThisstandardappliestosampleswithaflashpointhigherthan40°C.MainInstruments:Pensky-Martensclosedcupflashpointtester,Thermometer.3.TestPrinciplesandInstrumentsTestprinciple:Continuousstirringatspecifiedrateandheatingthesampleataconstantrate,atspecifiedtemperatureintervals,leadthefireintotheopeningofthetestcup,flashasampleofsteam,andtheminimumtemperaturespreadtothesurfaceoftheliquid,thistemperatureisaflashpointatambientatmosphericpressureFigure3-13PCB308intelligentclosed-endflashpointtester03TestingStepPutthedeterminingcupwiththesampleintotheheatingchamber,putalidonignitiontestsource,theflamediameterwasadjustedto3~4mmorturnontheelectronicigniter,adjustthestrengthoftheelectronicigniter.Startheatingandheating.Recordingthetemperatureatwhichthefirecausesasignificantignitioninthetestcup,observedflashpointasasample,doatleastthreeparalleltests,taketheaveragevalueMethodA:Iftheexpectedflashpointofthesampleisbelow110℃,startignitionat23℃±5℃belowexpectedflashpoint,ignitionat1℃foreveryincreaseintemperatureMethodB:Iftheexpectedflashpointofthesampleishigherthan110℃,startignitionat23℃and5℃belowexpectedflashpoint,thesampleisignitedat2℃perrise0102RemarksItemsSpecimenwatercontentWhenthewatercontentofthesampleisgreaterthan0.05%,thewatermustbedehydratedbeforetheflashpointdetermination.HeatingspeedMethodA:Thesampleisheatedatarateof5~6(℃/min)andthestirringratewas90~120(r/min).MethodB:Thesampleisheatedatarateof1-1.5(℃/min)andthestirringratewas250±10(r/min).IgnitioncontrolStopstirringwhenigniting,aknob,handle,origniteronacupcover.theflameisrequiredtodescendtothevaporspaceofthetestcupwithin0.5s,andstayatthisposition1s,thenriserapidlybacktotheoriginalpositionVI.OriginalRecordsandDataProcessingOriginalRecords:Beforethetestbegins,weshouldfirstfillouttheheaderpartoftherecordsheet,andthetestdatapartshouldbefilledinintimewiththetestprogress,anditisnotallowedtofillinaftertheteste