ASTM D7155-11
(Practice)Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils
Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils
SIGNIFICANCE AND USE
The compatibility of oils can be important for users of oil-lubricated equipment. It is well known that the mixing of two oils can produce a substance markedly inferior to either of its constituent materials. One or more of the following can occur:
A mixture of incompatible oils most often forms a precipitate.
The precipitate will form unwanted deposits in the lubrication system, plug filters and oil passageways.
Such events can lead to catastrophic equipment failures.
Because of such occurrences, lubricant suppliers recommend evaluating compatibility of lubricating oil of different formulations and sources prior to mixing. Equipment users most often do not have the resources to evaluate oil compatibility and must rely on their suppliers. Mixing of oils is a highly imprudent practice without first determining the compatibility.
Although new turbine oils may be compatible, in-service oil of the same type may be degraded or contaminated to such an extent that the new oil added may not be compatible with the system oil. In-service oil compatibility with new oil additions should be evaluated on a case by case basis.
The oxidation resistance of different oils of the same type can vary widely, and compatibility does not imply equivalent performance.
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 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.
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 ViscosityTest Method D445 AcidityTest Methods D664 and D974 Pentane InsolubleTest Method D893 Copper Corrosion Test Method D130 Rust Prevention Test Method D665 Foaming CharacteristicsTest Method D892 Air Release PropertiesTest Method D3427 Water SeparabilityTest 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.
1.6 Sequential or concurrent testing is continued until the test requestor or user is satisfied that the intent of this practice has been met. If any mixture fails the...
General Information
Relations
Buy Standard
Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7155 − 11
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
Foaming Characteristics Test Method D892
Air Release Properties Test Method D3427
1.1 This practice covers the compatibility of mixtures of
Water Separability Test Method D1401
turbine lubricating oils of the same ISO VG grade and type as Oxidation Stability Test Note 1
defined by Specification D4304. The Tier 1 method compares
1.5.1 For compatible mixtures, a supplemental (nonmanda-
the visual appearances of specific mixtures with those of the
tory) testing scheme is suggested when circumstances indicate
neat oils after storage at specified conditions.
the need for additional testing the beyond Tier 2 primary
recommended tests.
1.2 If the current in-service oil is causing problems or if
NOTE 1—The oxidation stability test method should be selected based
circumstances indicate the need for additional testing, a Tier 2
on the product type and in agreement with the lubricant supplier (see
method compares selected performance properties of the mix-
AppendixX2foroptions).Unlikeothertestsdescribedinthispractice,the
ture and its constituent oils.
impact on oxidation stability may not be easily interpreted with a pass/fail
rating. The user is encouraged to contact the lubricant supplier for
1.3 The Tier 1 and Tier 2 methods can be used to evaluate
assistance in the evaluation of the data.
new (unused) lubricant compatibility or the effects of adding
new (unused) lubricant to in-service lubricant in the system. 1.6 Sequential or concurrent testing is continued until the
test requestor or user is satisfied that the intent of this practice
1.4 This practice does not evaluate the wear prevention
has been met. If any mixture fails the Tier 1 visual appearance
characteristics, load carrying capacity, or the mechanical shear
method or any of the Tier 2 primary tests, when requested, the
stability of lubricants mixtures while in service. If anti-wear
oils are incompatible. If all mixtures pass the Tier 1 or Tier 2
(AW), extreme pressure (EP), or shear stability are to be
tests, the oils are considered compatible by those methods.
evaluated, further testing of these parameters may be required.
1.4.1 Tier 1—Mixtures of the two constituent oils to be
1.7 This practice applies only to lubricating oils having
evaluated are prepared at specified proportions, stored in an
characteristics suitable for evaluation by the suggested test
oven at 65°C for 168 h, and then evaluated for changes in
methods. If the scope of a specific test method limits testing to
physical appearance.
those oils within a specified range of properties, oils outside
1.4.2 Tier 1—Mixtures of the two constituent oils to be
that range cannot be tested for compatibility by that test
evaluated are prepared at specified proportions, stored in an
method.
oven at 65°C for 168 h, and then evaluated for changes
1.8 This practice may be used to evaluate the compatibility
physical appearance and parameters detailed in 7.3.
of different types and grades of oil. However, it is not intended
1.5 Mixtures of the two constituent oils are evaluated in a
to evaluate such mixtures. The user is advised to consult with
primary testing protocol using the following standards:
suppliers in these situations.
Appearance (Tier 1 and Tier 2) Appendix X1
1.9 This practice does not purport to cover all test methods
Kinematic Viscosity Test Method D445
Acidity Test Methods D664 and D974 that could be employed.
Pentane Insoluble Test Method D893
1.10 The values stated in SI units are to be regarded as the
Copper Corrosion Test Method D130
Rust Prevention Test Method D665
standard. The values given in parentheses are for information
only.
1
1.11 This standard does not purport to address all of the
This practice is under the jurisdiction ofASTM Committee D02 on Petroleum
Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcom-
safety concerns, if any, associated with its use. It is the
mittee D02.C0.01 on Turbine Oil Monitoring, Problems and Systems.
responsibility of the user of this standard to establish appro-
Current edition approved Oct. 1, 2011. Published November 2011. Originally
priate safety and health practices and determine the applica-
approved in 2006. Last previous edition approved in 2006 as D7155–06. DOI:
10.1520/D7155-11. bility of regulatory limitations prior to use.
Copyright © ASTM International, 100 Barr Harbor Drive, PO
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:D7155–06 Designation:D7155–11
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
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 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.
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 methodpractice 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 (seeAppendix
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.
1.6 Sequential or concurrent testing is continued 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 are
incompatible. If all mixtures pass the Tier 1 or Tier 2 tests, the oils are considered compatible by those methods.
1.7 This practice applies only to lubricating oils having characteristics suitable for evaluation by the suggested test methods.
Ifthescopeofaspecifictestmethodlimitstestingtothoseoilswithinaspecifiedrangeofproperties,oilsoutsidethatrangecannot
be tested for compatibility by that test method.
1.8 This practice may be used to evaluate the compatibility of different types and grades of oil. However, it is not intended to
evaluate such mixtures. The user is advised to consult with suppliers in these situations.
1.9 This practice does not purport to cover all test methods that could be employed.
1
This practice is under the jurisdiction of ASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.C0 on
Turbine Oils.
Current edition approved Dec. 1, 2006. Published January 2007. DOI: 10.1520/D7155-06.
Current edition approved Oct. 1, 2011. Published November 2011. Originally approved in 2006. Last previous edition approved in 2006 as D7155–06. DOI:
10.1520/D7155-11.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ------
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.