ASTM_D_8185_-_18.pdf

Designation:D818518Standard Guide forIn-Service Lubricant Viscosity Measurement1This standard is issued under the fixed designation D8185;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 Significance and Determination of ViscosityThe pur-pose of this guide is to provide sufficient knowledge for aperson with some technical background in lubrication orcondition monitoring from which they can determine the bestchoice for measuring viscosity of an in-service oil.Suchinformation from this guide should enable the user to engage inproductive discussions with colleagues,service providers,managers,and service personnel about obtaining and usinginformation on and from viscosity.There are a number ofdifferent approaches to viscometric measurement,and thisguide is intended to be a helpful resource in selecting the mostappropriate viscometric approach to gain information for thein-service fluid.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D446 Specifications and Operating Instructions for GlassCapillary Kinematic ViscometersD2983 Test Method for Low-Temperature Viscosity of Au-tomatic Transmission Fluids,Hydraulic Fluids,and Lubri-cants using a Rotational ViscometerD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4378 Practice for In-Service Monitoring of Mineral Tur-bine Oils for Steam,Gas,and Combined Cycle TurbinesD4683 Test Method for Measuring Viscosity of New andUsed Engine Oils at High Shear Rate and High Tempera-ture by Tapered Bearing Simulator Viscometer at 150 CD5133 Test Method for Low Temperature,Low Shear Rate,Viscosity/Temperature Dependence of Lubricating OilsUsing a Temperature-Scanning TechniqueD5293 Test Method for Apparent Viscosity of Engine Oilsand Base Stocks Between 10 C and 35 C UsingCold-Cranking SimulatorD5478 Test Methods for Viscosity of Materials by a FallingNeedle ViscometerD6224 Practice for In-Service Monitoring of Lubricating Oilfor Auxiliary Power Plant EquipmentD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6304 Test Method for Determination of Water in Petro-leum Products,Lubricating Oils,and Additives by Cou-lometric Karl Fischer TitrationD6616 Test Method for Measuring Viscosity at High ShearRate by Tapered Bearing Simulator Viscometer at 100 CD6896 Test Method for Determination of Yield Stress andApparent Viscosity of Used Engine Oils at Low Tempera-tureD7042 Test Method for Dynamic Viscosity and Density ofLiquids by Stabinger Viscometer(and the Calculation ofKinematic Viscosity)D7110 Test Method for Determining the Viscosity-Temperature Relationship of Used and Soot-ContainingEngine Oils at Low TemperaturesD7279 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids by Automated Houillon Viscometer1This guide is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.96 on In-Service Lubricant Testing and Condition Monitoring Services.Current edition approved April 1,2018.Published June 2018.DOI:10.1520/D8185-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Tr