ASTM D7669-20
(Guide)Standard Guide for Practical Lubricant Condition Data Trend Analysis
Standard Guide for Practical Lubricant Condition Data Trend Analysis
SIGNIFICANCE AND USE
5.1 This guide is intended to provide machinery maintenance and monitoring personnel with a guideline for performing trend analysis to aid in the interpretation of machinery condition data.
SCOPE
1.1 This guide covers practical techniques for condition data trend analysis.
1.2 The techniques may be utilized for all instrumentation that provides numerical test results. This guide is written specifically for data obtained from lubricant samples. Other data obtained and associated with the machine may also be used in determining the machine condition.
1.3 This guide provides a methodology for assessing changes in lubricant during service. For limits on a specific lubricant parameter used in different system types, users should refer to Practice D4378, Practice D6224, or other established industry criteria, such as from the OEM. Guide D7720 may be used to determine limits if unavailable through the other references given.
1.4 This guide does not address upper or lower control limits. These limits are provided by product manufacturers, defined in ASTM specifications, or both. The range between upper and lower control limits should be greater than the range within each test method’s repeatability coefficient. See Practices D3244, D6299, and D6792 for more information about ensuring that process control limits do not violate statistical fundamentals.
1.5 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.
1.6 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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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: D7669 − 20
Standard Guide for
1
Practical Lubricant Condition Data Trend Analysis
This standard is issued under the fixed designation D7669; 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.
INTRODUCTION
This standard provides specific guidelines for trend analysis, as they are applied to condition
monitoring of machinery. The main purpose of trend analysis is to learn how rapidly the machine and
fluid are deteriorating.Asignificant change in trend is indicative of a developing failure. Intervention
in the early stages of deterioration is much more cost effective than failure of the machine.
Maximum reliability of in-service machine components and fluids requires a program of condition
monitoring to provide timely indications of performance and remaining usable life. To achieve these
goals, a condition monitoring program should monitor the rate of progression of the failure by
including sufficient tests to determine the rate of degradation, increase of contaminants, and quantity
and identity of metal debris from corrosion or wear.
The condition monitoring process determines the presence of oil-related failure modes, allowing
remedial maintenance to take place before failure and subsequently expensive equipment damage
occurs. In order to diagnose and predict machinery and fluid condition, the rate of change of machine
condition must be trended. Equipment maintainers expect conditionmonitoring information to clearly
and consistently indicate machinery condition, that is, the rate-of-change of component damage over
time and the risk of failure.
Trending utilizes a comparison of a condition parameter with time. For example, plots of a
condition-related parameter as a function of time is used to determine when the parameter is likely to
exceed a given limit. Forecasting the expected breakdown of a machine well in advance enables the
operator to minimize the machine’s downtime
1. Scope* industry criteria, such as from the OEM. Guide D7720 may be
used to determine limits if unavailable through the other
1.1 Thisguidecoverspracticaltechniquesforconditiondata
references given.
trend analysis.
1.4 This guide does not address upper or lower control
1.2 The techniques may be utilized for all instrumentation
limits. These limits are provided by product manufacturers,
that provides numerical test results. This guide is written
defined in ASTM specifications, or both. The range between
specifically for data obtained from lubricant samples. Other
upper and lower control limits should be greater than the range
data obtained and associated with the machine may also be
within each test method’s repeatability coefficient. See Prac-
used in determining the machine condition.
tices D3244, D6299, and D6792 for more information about
1.3 This guide provides a methodology for assessing
ensuring that process control limits do not violate statistical
changes in lubricant during service. For limits on a specific
fundamentals.
lubricantparameterusedindifferentsystemtypes,usersshould
1.5 This standard does not purport to address all of the
refer to Practice D4378, Practice D6224, or other established
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
1
This guide is under the jurisdiction of ASTM Committee D02 on Petroleum
mine the applicability of regulatory limitations prior to use.
Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom-
mittee D02.96.04 on Guidelines for In-Services Lubricants Analysis.
1.6 This international standard was developed in accor-
Current edition approved Oct. 1, 2020. Published October 2020. Originally
dance with internationally recognized principles on standard-
approved in 2011. Last previous edition approved in 2015 as D7669 – 15.
DOI:10.1520/D7669-20. ization established in the Decision on Principles for the
*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 ----------------------
D7669 − 20
Development of International Standards, Guides and Recom- 3.2.1 alarm, n—a means of alerting the operator that a
mendations issued by the World Trade Organization Technical particular condition exists.
Barriers to Trade (TBT)
...
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: D7669 − 15 D7669 − 20
Standard Guide for
1
Practical Lubricant Condition Data Trend Analysis
This standard is issued under the fixed designation D7669; 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.
INTRODUCTION
This standard provides specific guidelines for trend analysis, as they are applied to condition
monitoring of machinery. The main purpose of trend analysis is to learn how rapidly the machine and
fluid are deteriorating. A significant change in trend is indicative of a developing failure. Intervention
in the early stages of deterioration is much more cost effective than failure of the machine.
Maximum reliability of in-service machine components and fluids requires a program of condition
monitoring to provide timely indications of performance and remaining usable life. To achieve these
goals, a condition monitoring program should monitor the rate of progression of the failure by
including sufficient tests to determine the rate of degradation, increase of contaminants, and quantity
and identity of metal debris from corrosion or wear.
The condition monitoring process determines the presence of oil-related failure modes, allowing
remedial maintenance to take place before failure and subsequently expensive equipment damage
occurs. In order to diagnose and predict machinery and fluid condition, the rate of change of machine
condition must be trended. Equipment maintainers expect conditionmonitoring information to clearly
and consistently indicate machinery condition, that is, the rate-of-change of component damage over
time and the risk of failure.
Trending utilizes a comparison of a condition parameter with time. For example, plots of a
condition-related parameter as a function of time is used to determine when the parameter is likely to
exceed a given limit. Forecasting the expected breakdown of a machine well in advance enables the
operator to minimize the machine’s downtime
1. Scope*
1.1 This guide covers practical techniques for condition data trend analysis.
1.2 The techniques may be utilized for all instrumentation that provides numerical test results. This guide is written specifically
for data obtained from lubricant samples. Other data obtained and associated with the machine may also be used in determining
the machine condition.
1.3 This guide provides a methodology for assessing changes in lubricant during service. For limits on a specific lubricant
parameter used in different system types, users should refer to Practice D4378, Practice D6224, or other established industry
criteria, such as from the OEM. Guide D7720 may be used to determine limits if unavailable through the other references given.
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
D02.96.04 on Guidelines for In-Services Lubricants Analysis.
Current edition approved April 1, 2015Oct. 1, 2020. Published May 2015October 2020. Originally approved in 2011. Last previous edition approved in 20112015 as
D7669 – 11.D7669 – 15. DOI:10.1520/D7669-15.DOI:10.1520/D7669-20.
*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 ----------------------
D7669 − 20
1.4 This guide does not address upper or lower control limits. These limits are provided by product manufacturers, defined in
ASTM specifications, or both. The range between upper and lower control limits should be greater than the range within each test
method’s repeatability coefficient. See Practices D3244, D6299, and D6792 for more information about ensuring that process
control limits do not violate statistical fundamentals.
1.5 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of In
...
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