Designation:D4740−04(Reapproved2014)StandardTestMethodforCleanlinessandCompatibilityofResidualFuelsbySpotTest1ThisstandardisissuedunderthefixeddesignationD4740;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversseparateproceduresfordeter-miningthecleanlinessofresidualfueloilandthecompatibilityofaresidualfueloilwithablendstock.Itisapplicabletoresidualfueloilswithviscositiesupto50cSt(1cSt=1mm2s)at100°C.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4177PracticeforAutomaticSamplingofPetroleumandPetroleumProducts2.2ASTMAdjuncts:3ReferenceSpotSheet3.Terminology3.1DescriptionsofTermsSpecifictoThisStandard:3.1.1blendstock,n—afinishedresidualfueloilorfueloilcomponent,includingpetroleumstreamsrangingfromkero-sinetoresidualsandasphalt.3.1.2cleanliness,n—ofresidualfuel,theabsenceofsus-pendedsolidsinafinishedsample.3.1.3compatibility,n—ofresidualfuel,theabsenceofsuspendedsolidswhenequalvolumesofasampleandablendstockaremixedtogether.4.SummaryofTestMethod4.1CleanlinessProcedure—Adropofthepreheatedandthoroughlymixedsampleisputonatestpaperandplacedinanovenat100°C.After1h,thetestpaperisremovedfromtheovenandtheresultantspotisexaminedforevidenceofsuspendedsolidsandratedforcleanlinessusingtheD4740AdjunctReferenceSpotSheet.4.2CompatibilityProcedure—Ablendcomposedofequalvolumesofthesamplefueloilandtheblendstockistestedinthesamewayasdescribedin4.1andrate...
