ASTM D8185-18
(Guide)Standard Guide for In-Service Lubricant Viscosity Measurement
Standard Guide for In-Service Lubricant Viscosity Measurement
SCOPE
1.1 Significance and Determination of Viscosity—The purpose of this guide is to provide sufficient knowledge for a person with some technical background in lubrication or condition monitoring from which they can determine the best choice for measuring viscosity of an in-service oil. Such information from this guide should enable the user to engage in productive discussions with colleagues, service providers, managers, and service personnel about obtaining and using information on and from viscosity. There are a number of different approaches to viscometric measurement, and this guide is intended to be a helpful resource in selecting the most appropriate viscometric approach to gain information for the in-service fluid.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D8185 − 18
Standard Guide for
1
In-Service Lubricant Viscosity Measurement
This standard is issued under the fixed designation D8185; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
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2.1 ASTM Standards:
1.1 Significance and Determination of Viscosity—The pur-
D445Test Method for Kinematic Viscosity of Transparent
pose of this guide is to provide sufficient knowledge for a
and Opaque Liquids (and Calculation of DynamicViscos-
person with some technical background in lubrication or
ity)
condition monitoring from which they can determine the best
D446Specifications and Operating Instructions for Glass
choice for measuring viscosity of an in-service oil. Such
Capillary Kinematic Viscometers
informationfromthisguideshouldenabletheusertoengagein
D2983Test Method for Low-Temperature Viscosity of Au-
productive discussions with colleagues, service providers,
tomaticTransmissionFluids,HydraulicFluids,andLubri-
managers, and service personnel about obtaining and using
cants using a Rotational Viscometer
information on and from viscosity. There are a number of
D4057Practice for Manual Sampling of Petroleum and
different approaches to viscometric measurement, and this
Petroleum Products
guide is intended to be a helpful resource in selecting the most
D4378Practice for In-Service Monitoring of Mineral Tur-
appropriate viscometric approach to gain information for the
bine Oils for Steam, Gas, and Combined Cycle Turbines
in-service fluid.
D4683Test Method for Measuring Viscosity of New and
Used Engine Oils at High Shear Rate and High Tempera-
1.2 The values stated in either SI units or inch-pound units
ture by Tapered Bearing Simulator Viscometer at 150°C
are to be regarded separately as standard. The values stated in
D5133Test Method for Low Temperature, Low Shear Rate,
each system are not necessarily exact equivalents; therefore, to
Viscosity/Temperature Dependence of Lubricating Oils
ensure conformance with the standard, each system shall be
Using a Temperature-Scanning Technique
used independently of the other, and values from the two
D5293Test Method for Apparent Viscosity of Engine Oils
systems shall not be combined.
and Base Stocks Between –10°C and –35°C Using
1.3 This standard does not purport to address all of the Cold-Cranking Simulator
safety concerns, if any, associated with its use. It is the D5478Test Methods for Viscosity of Materials by a Falling
Needle Viscometer
responsibility of the user of this standard to establish appro-
D6224PracticeforIn-ServiceMonitoringofLubricatingOil
priate safety, health, and environmental practices and deter-
for Auxiliary Power Plant Equipment
mine the applicability of regulatory limitations prior to use.
D6299Practice for Applying Statistical Quality Assurance
1.4 This international standard was developed in accor-
and Control Charting Techniques to Evaluate Analytical
dance with internationally recognized principles on standard-
Measurement System Performance
ization established in the Decision on Principles for the
D6304Test Method for Determination of Water in Petro-
Development of International Standards, Guides and Recom-
leum Products, Lubricating Oils, and Additives by Cou-
mendations issued by the World Trade Organization Technical
lometric Karl Fischer Titration
Barriers to Trade (TBT) Committee.
D6616Test Method for Measuring Viscosity at High Shear
Rate by Tapered Bearing Simulator Viscometer at 100°C
D6896Test Method for Determination of Yield Stress and
ApparentViscosity of Used Engine Oils at LowTempera-
ture
D7042Test Method for Dynamic Viscosity and Density of
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This guide is under the jurisdiction of ASTM Committee D02 on Petroleum
Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom-
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mittee D02.96.01 on In-Service Lubricant Viscosity Testing Practices and Tech- For referenced ASTM standards, visit the ASTM website, www.astm.org, or
niques. contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Current edition approved April 1, 2018. Published June 2018. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
D8185-18. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D8185 − 18
Liquids by Stabinger Viscometer (and the Calcul
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