MIL-STD-731A (NOTICE 3), MILITARY STANDARD: QUALITY OF WOOD MEMBERS FOR CONTAINERS AND PALLETS (03 MAY 2002) [S/S by ASTM-D6199]., MIL-STD-731A, dated 4 October 1990, is hereby canceled and superseded by ASTM D6199 entirely.【英文标准名称】:StandardTestMethodforExplosibilityofDustClouds
【原文标准名称】:尘雾爆炸性的标准试验方法
【标准号】:ASTME1226-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:E27.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:dustexplosion;explosionpressure;Deflagrationparameters;Dustignition/explosion;Homogeneity;Ignition--rubber/cellularmaterials;Pressuretesting;Temperaturetests;Turbulence
【摘要】:Thistestmethodprovidesaprocedureforperforminglaboratoryteststoevaluatedeflagrationparametersofdusts.ThedatadevelopedbythistestmethodmaybeusedforthepurposeofsizingdeflagrationventsinconjunctionwiththenomographspublishedinNFPA68,ISO6184/1,orVDI3673.Thevaluesobtainedbythistestingtechniquearespecifictothesampletestedandthemethodusedandarenottobeconsideredintrinsicmaterialconstants.Forhard-to-ignitedustswithlowKSt-values,averystrongignitormayoverdrivea20-Lchamber,asdiscussedinE1515andRef2.Ifadusthasmeasurable(nonzero)Pmax-andKSt-valueswitha5000or10000-Jignitorbutnotwitha2500-Jignitorina20-Lchamber,thismaybeanoverdrivensystem.Inthiscase,itisrecommendedthatthedustbetestedwitha10000-Jignitorinalargerchambersuchasa1-m3chambertodetermineifitisactuallyexplosible.1.1Purpose.Thepurposeofthistestmethodistoprovidestandardtestmethodsforcharacterizingthex201C;explosibilityx201D;ofdustcloudsintwoways,firstbydeterminingifadustisx201C;explosible,x201D;meaningacloudofdustdispersedinairiscapableofpropagatingadeflagration;or,ifexplosible,determiningthedegreeofx201C;explosibility,x201D;meaningthepotentialexplosionhazardofadustcloudascharacterizedbythedustexplosibilityparameters,maximumexplosionpressure,Pmax;maximumrateofpressurerise,(dP/dt)max;andexplosibilityindex,KSt.1.2Limitations.Resultsobtainedbytheapplicationofthemethodsofthisstandardpertainonlytocertaincombustioncharacteristicsofdisperseddustclouds.Noinferenceshouldbedrawnfromsuchresultsrelatingtothecombustioncharacteristicsofdustsinotherformsorconditions(e.g.,ignitiontemperatureorsparkignitionenergyofdustclouds,ignitionpropertiesofdustlayersonhotsurfaces,ignitionofbulkdustinheatedenvironments,etc.)1.3Use.Itisintendedthatresultsobtainedbyapplicationofthistestbeusedaselementsofanexplosionriskassessmentthattakesintoaccountotherpertinentriskfactors;andinthespecificationofexplosionpreventionsystems(see,forexampleNFPA68,NFPA69,andNFPA654)whenusedinconjunctionwithapprovedorrecognizeddesignmethodsbythoseskilledintheart.Note18212;Historically,theevaluationofthedeflagrationparametersofmaximumpressureandmaximumrateofpressurerisehasbeendoneusinga1.2-LHartmannApparatus.TestMethodE789,whichdescribesthismethod,hasbeenwithdrawn.Theuseofdataobtainedfromthetestmethodinthedesignofexplosionprotectionsystemsisnotrecommended.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:C71
【国际标准分类号】:17_100
【页数】:12P.;A4
【正文语种】:英语