Designation:D6940−10StandardPracticeforMeasuringSiftingSegregationTendenciesofBulkSolids1ThisstandardisissuedunderthefixeddesignationD6940;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoversanapparatusandprocedureforsimulatingthesegregationtendenciesofbulksolidsbymeansofthesiftingmechanism.1.2Temperature-andhumidity-sensitivebulksolidsmayneedtobetestedatdifferenttemperaturesandmoisturecontents,aswouldhappeninanindustrialenvironment.1.3Themaximumparticlesizeshouldbelimitedto3mm,toreducethelikelihoodofbindingtheslidegate.1.4Thisstandardisnotapplicabletoallbulksolidsandsegregationmechanisms:whilesiftingisacommonsegrega-tionmechanismexperiencedbymanybulksolids,othersegregationmechanismsnotevaluatedbythisstandardmightinducesegregationinpractice.PracticeD6941coversanothercommonmechanism:fluidization.1.5Theextenttowhichsegregationwilloccurinanindustrialsituationisnotonlyafunctionofthebulksolidanditstendencytosegregate,butalsothehandlingequipment(forexample,bindesign),process(forexample,transferrates),andenvironment.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D653TerminologyRelatingtoSoil,Rock,andContainedFluidsD2216TestMethodsforLaboratoryDeterminationofWater(Moisture)ContentofSoilandRockbyMassD3740PracticeforMinimumRequirementsforAgenciesEngagedinTestingand/orInspectionofSoilandRockasUsedinEngineeringDesignandConstructionD6941PracticeforMeasuringFluidizationSegregationTen-denciesofPowders3.Terminology3....
