ASTM D7843-18
(Test Method)Standard Test Method for Measurement of Lubricant Generated Insoluble Color Bodies in In-Service Turbine Oils using Membrane Patch Colorimetry
Standard Test Method for Measurement of Lubricant Generated Insoluble Color Bodies in In-Service Turbine Oils using Membrane Patch Colorimetry
SIGNIFICANCE AND USE
5.1 This test can be a guide to end-users on the formation of lubricant-generated, insoluble deposits.
5.2 The results from this test are intended to be used as a condition monitoring trending tool as part of a comprehensive program, as outlined in standards such as Practice D4378.
SCOPE
1.1 This test method extracts insoluble contaminants from a sample of in-service turbine oil onto a patch and the color of the membrane patch is analyzed by a spectrophotometer. The results are reported as a ΔE value, within the CIE LAB scale.
1.2 This test method is not appropriate for turbine oils with dyes.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.
1.5 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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Designation: D7843 − 18
Standard Test Method for
Measurement of Lubricant Generated Insoluble Color
Bodies in In-Service Turbine Oils using Membrane Patch
1
Colorimetry
This standard is issued under the fixed designation D7843; 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* E177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
1.1 This test method extracts insoluble contaminants from a
E284 Terminology of Appearance
sample of in-service turbine oil onto a patch and the color of
E308 PracticeforComputingtheColorsofObjectsbyUsing
the membrane patch is analyzed by a spectrophotometer. The
the CIE System
results are reported as a∆E value, within the CIE LAB scale.
E691 Practice for Conducting an Interlaboratory Study to
1.2 This test method is not appropriate for turbine oils with
Determine the Precision of a Test Method
dyes.
3. Terminology
1.3 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this 3.1 Definitions:
standard.
3.1.1 CIELAB color scales, n—CIE 1976 L*, a*, b*
opponent-color scales, in which a* is positive in the red
1.4 This standard does not purport to address all of the
direction and negative in the green direction; b* is positive in
safety concerns, if any, associated with its use. It is the
the yellow direction and negative in the blue direction; and L*
responsibility of the user of this standard to establish appro-
is positive in the lightness direction and negative in the
priate safety, health, and environmental practices and deter-
darkness direction. E308
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor- 3.1.2 colorimetry, n—the science of color measurement.
dance with internationally recognized principles on standard- E284
ization established in the Decision on Principles for the
3.1.3 in-service oil, n—lubricating oil that is present in a
Development of International Standards, Guides and Recom-
machine that has been at operating temperature for at least one
mendations issued by the World Trade Organization Technical
hour.
Barriers to Trade (TBT) Committee.
3.1.4 membrane color, n—a visual rating of particulate on a
filter membrane against ASTM Color Standards.
2. Referenced Documents
2 3.1.5 membrane filter, n—a porous article of closely con-
2.1 ASTM Standards:
trolled pore size through which a liquid is passed to separate
D4057 Practice for Manual Sampling of Petroleum and
matter in suspension.
Petroleum Products
3.2 Definitions of Terms Specific to This Standard:
D4177 Practice for Automatic Sampling of Petroleum and
3.2.1 varnish, n—a thin, hard, lustrous, oil-insoluble
Petroleum Products
deposit, composed primarily of organic residue, and most
D4378 Practice for In-Service Monitoring of Mineral Tur-
bine Oils for Steam, Gas, and Combined Cycle Turbines readily definable by color intensity. It is not easily removed by
wiping with a clean, dry, soft, lint-free wiping material and is
resistant to saturated solvents. Its color may vary, but it usually
1
This test method is under the jurisdiction of ASTM Committee D02 on appears in gray, brown, or amber hues.
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.C0.01 on Turbine Oil Monitoring, Problems and Systems.
4. Summary of Test Method
Current edition approved Oct. 1, 2018. Published October 2018. Originally
4.1 Insoluble deposits are extracted from an in-service
approved in 2012. Last previous edition approved in 2016 as D7843 – 16. DOI:
10.1520/D7843-18.
turbine oil sample using a 47 mm, 0.45 µm membrane nitro-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
cellulose patch. The color of the patch is then analyzed using
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
a spectrophotometer and the results are reported as a∆E value
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in the CIE LAB scale.
*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
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D7843 − 18
to increase deposit levels. This exposure can occur upon drawing of the
5. Significance and Use
sample as well as during incubation period. Wide-mouth laboratory
5.1 This test can be a guide to end-users on the formation of
qualityamberhigh-densitypolyethylene(HDPE)bottleshavebeensh
...
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: D7843 − 16 D7843 − 18
Standard Test Method for
Measurement of Lubricant Generated Insoluble Color
Bodies in In-Service Turbine Oils using Membrane Patch
1
Colorimetry
This standard is issued under the fixed designation D7843; 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*
1.1 This test method extracts insoluble contaminants from a sample of in-service turbine oil onto a patch and the color of the
membrane patch is analyzed by a spectrophotometer. The results are reported as a ΔE value, within the CIE LAB scale.
1.2 This test method is not appropriate for turbine oils with dyes.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 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.
1.5 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:
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
D4378 Practice for In-Service Monitoring of Mineral Turbine Oils for Steam, Gas, and Combined Cycle Turbines
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E284 Terminology of Appearance
E308 Practice for Computing the Colors of Objects by Using the CIE System
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions:
3.1.1 CIELAB color scales, n—CIE 1976 L*, a*, b* opponent-color scales, in which a* is positive in the red direction and
negative in the green direction; b* is positive in the yellow direction and negative in the blue direction; and L* is positive in the
lightness direction and negative in the darkness direction. E308
3.1.2 colorimetry, n—the science of color measurement. E284
3.1.3 in-service oil, n—lubricating oil that is present in a machine that has been at operating temperature for at least one hour
(for example, an engine, gearbox, transformer, or turbine).hour.
3.1.4 membrane color, n—a visual rating of particulate on a filter membrane against ASTM Color Standards.
3.1.5 membrane filter, n—a porous article of closely controlled pore size through which a liquid is passed to separate matter in
suspension.
1
This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.C0.01 on Turbine Oil Monitoring, Problems and Systems.
Current edition approved June 1, 2016Oct. 1, 2018. Published August 2016October 2018. Originally approved in 2012. Last previous edition approved in 20122016 as
D7843 – 12.D7843 – 16. DOI: 10.1520/D7843-16.10.1520/D7843-18.
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 ----------------------
D7843 − 18
3.2 Definitions of Terms Specific to This Standard:
3.2.1 varnish, n—a thin, hard, lustrous, oil-insoluble deposit, composed primarily of organic residue, and most readily definable
by color intensity. It is not easily removed by wiping with a clean, dry, soft, lint-free wiping material and is resistant to saturated
solvents. Its color may vary, but it usually appears in gray, brown, or amber hues.
4. Summary of Test Method
4.1 Insoluble deposits are extracted from an in-service turbine oil sample using a 47 mm, 0.45 μm membrane nitro-cellulose
pat
...
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