ASTM D7155-18
(Practice)Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils
Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils
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Designation: D7155 − 18
Standard Practice for
Evaluating Compatibility of Mixtures of Turbine Lubricating
1
Oils
This standard is issued under the fixed designation D7155; 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* with the highest confidence level. Testing each tier level is
giving the user more confidence that the two fluids are
1.1 This practice covers the compatibility of mixtures of
compatible.
turbine lubricating oils as defined by Specification D4304. The
1.7 This practice applies only to lubricating oils having
methods compare properties of specific mixtures with those of
characteristics suitable for evaluation by the suggested test
the neat oils after storage at specified conditions.
methods. If the scope of a specific test method limits testing to
1.2 The methods are grouped into four tiers of testing types:
those oils within a specified range of properties, oils outside
1.2.1 Tier 1—Visual appearance
that range cannot be tested for compatibility by that test
1.2.2 Tier 2—Interfacial properties
method.
1.2.3 Tier 3—Physical and chemical properties
1.8 This practice may be used to evaluate the compatibility
1.2.4 Tier 4—Specific performance properties
of different types and grades of oil. However, it is not intended
1.3 The methods can be used to evaluate new (unused)
to evaluate such mixtures for lubrication performance. The
lubricant compatibility or the effects of adding new (unused)
user is advised to consult with suppliers in these situations.
lubricant to in-service lubricant in the system.
1.9 This practice does not purport to cover all test methods
1.4 This practice does not evaluate the wear prevention
that could be employed.
characteristics, load carrying capacity, or the mechanical shear
1.10 The values stated in SI units are to be regarded as
stability of lubricants mixtures while in service. If anti-wear
standard. The values given in parentheses after SI units are
(AW), extreme pressure (EP), or shear stability are to be
provided for information only and are not considered standard.
evaluated, further testing of these parameters may be required.
1.11 This standard does not purport to address all of the
1.5 Mixtures of the two constituent oils are evaluated using
safety concerns, if any, associated with its use. It is the
the Tier 1 and Tier 2 testing protocol. Sequential or concurrent
responsibility of the user of this standard to establish appro-
testingiscontinuedbyapplyingtestsfromTier3orTier4until
priate safety, health, and environmental practices and deter-
the test requestor or user is satisfied that the intent of this
mine the applicability of regulatory limitations prior to use.
practicehasbeenmet.Ifanymixturefailsthemethods,theoils
1.12 This international standard was developed in accor-
are considered incompatible by that method. If all mixtures
dance with internationally recognized principles on standard-
pass the methods, the oils are considered compatible by those
ization established in the Decision on Principles for the
methods. It is recommended that passing only Tier 1 does not
Development of International Standards, Guides and Recom-
adequately test for fluid compatibility.
mendations issued by the World Trade Organization Technical
1.6 If the mixture passes Tier 1, it shows two oils are Barriers to Trade (TBT) Committee.
visually compatible only. If the mixture passes Tier 1 and 2, it
2. Referenced Documents
shows two oils are visually and interfacially compatible. If the
2
mixture passes Tier 1, 2 and 3, it shows two oils are visually, 2.1 ASTM Standards:
D130 Test Method for Corrosiveness to Copper from Petro-
interfacially, physically, and chemically compatible. If the
leum Products by Copper Strip Test
mixture passes Tier 1, 2, 3, 4, it shows two oils are compatible
D445 Test Method for Kinematic Viscosity of Transparent
and Opaque Liquids (and Calculation of Dynamic Viscos-
ity)
1
This practice is under the jurisdiction ofASTM Committee D02 on Petroleum
Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom-
2
mittee D02.C0.01 on Turbine Oil Monitoring, Problems and Systems. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved June 1, 2018. Published August 2018. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 2006. Last previous edition approved in 2011 as D7155 – 11. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D7155-18. the ASTM website.
*A Summary of Changes section appears at the e
...
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: D7155 − 11 D7155 − 18
Standard Practice for
Evaluating Compatibility of Mixtures of Turbine Lubricating
1
Oils
This standard is issued under the fixed designation D7155; 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 This practice covers the compatibility of mixtures of turbine lubricating oils of the same ISO VG grade and type as defined
by Specification D4304. The Tier 1 method compares the visual appearances methods compare properties of specific mixtures with
those of the neat oils after storage at specified conditions.
1.2 If the current in-service oil is causing problems or if circumstances indicate the need for additional testing, a Tier 2 method
compares selected performance properties of the mixture and its constituent oils.The methods are grouped into four tiers of testing
types:
1.2.1 Tier 1—Visual appearance
1.2.2 Tier 2—Interfacial properties
1.2.3 Tier 3—Physical and chemical properties
1.2.4 Tier 4—Specific performance properties
1.3 The Tier 1 and Tier 2 methods can be used to evaluate new (unused) lubricant compatibility or the effects of adding new
(unused) lubricant to in-service lubricant in the system.
1.4 This practice does not evaluate the wear prevention characteristics, load carrying capacity, or the mechanical shear stability
of lubricants mixtures while in service. If anti-wear (AW), extreme pressure (EP), or shear stability are to be evaluated, further
testing of these parameters may be required.
1.4.1 Tier 1—Mixtures of the two constituent oils to be evaluated are prepared at specified proportions, stored in an oven at 65°C
for 168 h, and then evaluated for changes in physical appearance.
1.4.2 Tier 1—Mixtures of the two constituent oils to be evaluated are prepared at specified proportions, stored in an oven at 65°C
for 168 h, and then evaluated for changes physical appearance and parameters detailed in 7.3.
1.5 Mixtures of the two constituent oils are evaluated in a primary testing protocol using the following standards:
Appearance (Tier 1 and Tier 2) Appendix X1
Kinematic Viscosity Test Method D445
Acidity Test Methods D664 and D974
Pentane Insoluble Test Method D893
Copper Corrosion Test Method D130
Rust Prevention Test Method D665
Foaming Characteristics Test Method D892
Air Release Properties Test Method D3427
Water Separability Test Method D1401
Oxidation Stability Test Note 1
1.5.1 For compatible mixtures, a supplemental (nonmandatory) testing scheme is suggested when circumstances indicate the
need for additional testing the beyond Tier 2 primary recommended tests.
NOTE 1—The oxidation stability test method should be selected based on the product type and in agreement with the lubricant supplier (see Appendix
X2 for options). Unlike other tests described in this practice, the impact on oxidation stability may not be easily interpreted with a pass/fail rating. The
user is encouraged to contact the lubricant supplier for assistance in the evaluation of the data.
1.5 Mixtures of the two constituent oils are evaluated using the Tier 1 and Tier 2 testing protocol. Sequential or concurrent
testing is continued by applying tests from Tier 3 or Tier 4 until the test requestor or user is satisfied that the intent of this practice
has been met. If any mixture fails the Tier 1 visual appearance method or any of the Tier 2 primary tests, when requested, the oils
1
This practice 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 Oct. 1, 2011June 1, 2018. Published November 2011August 2018. Originally approved in 2006. Last previous edition approved in 20062011 as
D7155D7155 – 11.–06. DOI: 10.1520/D7155-11.10.1520/D7155-18.
*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
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D7155 − 18
are incompatible. methods, the oils are considered incompatible by that method. If all mixtures pass the Tier 1 or Tier 2 tests,
methods, the oils are considered compatible by those methods. It is recommended that passing only Ti
...
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