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ASTM D 7155 Document Information:
Title
Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils
ASTM International
Publication Date:
Dec 1, 2006
Scope:
This practice covers the compatibility of mixtures of turbine
lubricating oils of the same ISO VG grade and type as defined by
Specification D 4304. The Tier 1 method compares the visual
appearances of specific mixtures with those of the neat oils after
storage at specified conditions.
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 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.
This method 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.
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.
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.
Mixtures of the two constituent oils are evaluated in a primary
testing protocol using the following standards:
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.
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.
This practice applies only to lubricating oils having
characteristics suitable for evaluation by the suggested test
methods. If the scope of a specific test method limits testing to
those oils within a specified range of properties, oils outside
that range cannot be tested for compatibility by that test
method.
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.
This practice does not purport to cover all test methods that
could be employed.
The values stated in SI units are to be regarded as the
standard. The values given in parentheses are for information
only.
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 and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- compatibility
- incompatibility
- lubricant mixtures
- lubricating oil
- mixtures
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