Designation:D7688−18StandardTestMethodforEvaluatingLubricityofDieselFuelsbytheHigh-FrequencyReciprocatingRig(HFRR)byVisualObservation1ThisstandardisissuedunderthefixeddesignationD7688;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoverstheevaluationofthelubricityofdieselfuelsusingahigh-frequencyreciprocatingrig(HFRR).1.2Thistestmethodisapplicabletomiddledistillatefuels,suchasGradesNo.1-DS15,S500,andS5000,andGradesNo.2-DS15,S500,andS5000dieselfuels,inaccordancewithSpecificationD975;andothersimilarpetroleum-basedfuelswhichcanbeusedindieselengines.Thistestmethodalsoisapplicabletobiodieselblends.B5wasincludedintheroundrobinprogramthatdeterminedtheprecisionstatement.NOTE1—Itisnotknownthatthistestmethodwillpredicttheperformanceofalladditive/fuelcombinations.Additionalworkisunder-waytoestablishthiscorrelationandfuturerevisionsofthistestmethodmaybenecessaryoncethisworkiscomplete.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.SpecificwarningstatementsaregiveninSection7.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D975SpecificationforDieselFuelOilsD4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4177PracticeforAutomaticSamplingofPetroleumandPetr...
