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【英文标准名称】:StandardTestMethodforAcidNumberofPetroleumProductsbySemi-MicroColorIndicatorTitration
【原文标准名称】:半微量颜色指示剂滴定法测定石油产品酸值的标准试验方法
【标准号】:ASTMD3339-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D02.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:acidnumber;petroleumproducts;semi-microcolorindicatortitration;Acidnumber--petroleumproducts;Fueloils;Gasturbinefueloils;Isopropylalcohol;Lubricants(fluid);Oxidationtesting--petroleumproducts;Semi-microcolorindicatortitration;T
【摘要】:ThistestmethodmeasurestheacidnumberofoilsobtainedfromlaboratoryoxidationtestsusingsmalleramountsofsamplethanTestMethodsD974orD664.IthasspecificapplicationinTestMethodD943inwhichsmallaliquotsofoilareperiodicallyremovedfortestingbyTestMethodD3339.Thistestmethod,therefore,providesameansofmonitoringtherelativeoxidationofoils,bymeasuringchangesinacidnumber,atdifferenttimeintervalsandunderthevariousoxidizingtestconditions.FIG.1SchematicDrawingofTypicalApparatus1.1Thistestmethodcoversthedeterminationofacidicconstituentsinneworusedpetroleumproductsandlubricantssolubleornearlysolubleinmixturesoftoluene,andisopropylalcohol.ThetestmethodisespeciallyintendedforcasesinwhichtheamountofsampleavailabletobeanalyzedistoosmalltoallowaccurateanalysisbyTestMethodsD974orD664.Itisapplicableforthedeterminationofacidshavingdissociationconstantsinwaterlargerthan10x2212;9.Extremelyweakacidshavingdissociationconstantssmallerthan10x2212;9donotinterfere.Saltstitrateiftheirhydrolysisconstantsarelargerthan10x2212;9.1.2Thistestmethodcanbeusedtoindicaterelativechangesinacidnumberthatoccurinanoilduringuseunderoxidizingconditions.Althoughthetitrationismadeunderdefiniteequilibriumconditions,themethoddoesnotmeasureanabsoluteacidicpropertythatcanbeusedtopredictperformanceofanoilunderserviceconditions.Nogeneralrelationshipbetweenbearingcorrosionandacidnumberisknown.1.3SincethistestmethodrequiressubstantiallylesssamplethanTestMethodsD974orD664,itprovidesanadvantageousmeansofmonitoringanoxidationtestbychangesinacidnumberby(1)minimizingtestsampledepletionforacidnumberanalysesandthusminimizingthedisturbanceofthetestor(2)allowingadditionalacidnumberanalysestobemadewhilemaintainingthesametestsampledepletionandthusprovidingadditionaldata.Note18212;Someoils,suchasmanycuttingoils,rust-proofingoils,andsimilarcompoundedoils,orexcessivelydark-coloredoils,maybemoredifficulttoanalyzebythistestmethodduetoobscurityofthecolor-indicatorendpoint.TheseoilscanbeanalyzedbyTestMethodD664providedsufficientsampleisavailable.However,thissituationismuchlesslikelyusingTestMethodD3339thanusingTestMethodD974duetotheuseofamorehighlydilutesampleduringthetitrationandduetothegreaterstabilityoftheendpointcolorchange.TheacidnumbersobtainedbyTestMethodD3339mayormaynotbenumericallythesameasthoseobtainedbyTestMethodD664buttheyshouldbeofthesameorderofmagnitude.Note28212;TheresultsobtainedusingthismethodhavebeenfoundtobenumericallythesameasthoseobtainedusingTestMethodD974,withintheprecisionofthetwomethods,forneworoxidizedlubricantsofthetypeprimarilyintendedforhydraulicorsteamturbinetypeservice.TheoxidizedlubricantswereobtainedusingtheTestMethodD943oxidationtest.Thiscorrelationisshownbythecorrelationcoefficientr

标准名称：	普通螺母和开槽螺母 第1部分:通用规范
中标分类：	航空、航天 >> 航空器与航天器零部件 >> 紧固件
ICS分类：	航空器和航天器工程 >> 航空航天制造用紧固件 >> 螺母
发布日期：	2002-11-20
实施日期：	2003-02-01
首发日期：
作废日期：
出版日期：
页数：	15页

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