ASTM D8185-23
(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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
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.
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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 − 23
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. A number 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
2
1.1 Significance and Determination of Viscosity—The pur- 2.1 ASTM Standards:
pose of this guide is to provide sufficient knowledge for a D445 Test Method for Kinematic Viscosity of Transparent
person with some technical background in lubrication or and Opaque Liquids (and Calculation of Dynamic Viscos-
condition monitoring from which they can determine the best ity)
choice for measuring viscosity of an in-service oil. Such D446 Specifications and Operating Instructions for Glass
information from this guide should enable the user to engage in Capillary Kinematic Viscometers
productive discussions with colleagues, service providers, D2983 Test Method for Low-Temperature Viscosity of Au-
managers, and service personnel about obtaining and using tomatic Transmission Fluids, Hydraulic Fluids, and Lubri-
information on and from viscosity. There are a number of cants using a Rotational Viscometer
different approaches to viscometric measurement, and this D4057 Practice for Manual Sampling of Petroleum and
guide is intended to be a helpful resource in selecting the most Petroleum Products
appropriate viscometric approach to gain information for the D4175 Terminology Relating to Petroleum Products, Liquid
in-service fluid. Fuels, and Lubricants
D4378 Practice for In-Service Monitoring of Mineral Tur-
1.2 The values stated in either SI units or inch-pound units
bine Oils for Steam, Gas, and Combined Cycle Turbines
are to be regarded separately as standard. The values stated in
D4683 Test Method for Measuring Viscosity of New and
each system are not necessarily exact equivalents; therefore, to
Used Engine Oils at High Shear Rate and High Tempera-
ensure conformance with the standard, each system shall be
ture by Tapered Bearing Simulator Viscometer at 150 °C
used independently of the other, and values from the two
D5133 Test Method for Low Temperature, Low Shear Rate,
systems shall not be combined.
Viscosity/Temperature Dependence of Lubricating Oils
1.3 This standard does not purport to address all of the
Using a Temperature-Scanning Technique
safety concerns, if any, associated with its use. It is the
D5293 Test Method for Apparent Viscosity of Engine Oils
responsibility of the user of this standard to establish appro-
and Base Stocks Between –10 °C and –35 °C Using
priate safety, health, and environmental practices and deter-
Cold-Cranking Simulator
mine the applicability of regulatory limitations prior to use.
D5478 Test Methods for Viscosity of Materials by a Falling
1.4 This international standard was developed in accor-
Needle Viscometer
dance with internationally recognized principles on standard-
D6224 Practice for In-Service Monitoring of Lubricating Oil
ization established in the Decision on Principles for the
for Auxiliary Power Plant Equipment
Development of International Standards, Guides and Recom-
D6299 Practice for Applying Statistical Quality Assurance
mendations issued by the World Trade Organization Technical
and Control Charting Techniques to Evaluate Analytical
Barriers to Trade (TBT) Committee.
Measurement System Performance
D6304 Test Method for Determination of Water in Petro-
leum Products, Lubricating Oils, and Additives by Cou-
1
This guide is under the jurisdiction of ASTM Committee D02 on Petroleum lometric Karl Fischer Titration
Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom-
mittee D02.96.01 on In-Service Lubricant Viscosity Testing Practices and Tech-
2
niques. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Dec. 1, 2023. Published January 2024. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2018. Last previous edition approved in 2018 as D8185 – 18. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D8185-23. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D8185 − 23
D6616 Test Method for Measuring Viscosity at High Sh
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D8185 − 18 D8185 − 23
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. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D446 Specifications and Operating Instructions for Glass Capillary Kinematic Viscometers
D2983 Test Method for Low-Temperature Viscosity of Automatic Transmission Fluids, Hydraulic Fluids, and Lubricants using
a Rotational Viscometer
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
D4378 Practice for In-Service Monitoring of Mineral Turbine Oils for Steam, Gas, and Combined Cycle Turbines
D4683 Test Method for Measuring Viscosity of New and Used Engine Oils at High Shear Rate and High Temperature by Tapered
Bearing Simulator Viscometer at 150 °C
D5133 Test Method for Low Temperature, Low Shear Rate, Viscosity/Temperature Dependence of Lubricating Oils Using a
Temperature-Scanning Technique
1
This guide is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.96.01 on In-Service Lubricant Viscosity Testing Practices and Techniques.
Current edition approved April 1, 2018Dec. 1, 2023. Published June 2018January 2024. Originally approved in 2018. Last previous edition approved in 2018 as
D8185 – 18. DOI: 10.1520/D8185-18.10.1520/D8185-23.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D8185 − 23
D5293 Test Method for Apparent Viscosity of Engine Oils and Base Stocks Between –10 °C and –35 °C Using Cold-Cranking
Simulator
D5478 Test Methods for Viscosity of Materials by a Falling Needle Viscometer
D6224 Practice for In-Service Monitoring of Lubricating Oil for Auxiliary Power Plant Equipment
D6299 Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measure-
ment System Performance
D6304 Test Method for Determination of W
...
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