Standard Test Method for
Air Release Properties of Petroleum Oils1
This standard is issued under the fixed designation D 3427; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This test method covers the ability of turbine, hydraulic,
and gear oils to separate entrained air.
NOTE 1—This test method was developed for mineral-based oils. It may
be used for some synthetic fluids; however, the precision statement applies
only to petroleum oils.
1.2 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.
2. Referenced Documents
2.1 ASTM Standards: 2
D 1193 Specification for Reagent Water
D 1401 Test Method for Water Separability of Petroleum
Oils and Synthetic Fluids
E 1 Specification for ASTM Thermometers
2.2 DIN Standard:3
DIN 51 381
3.1 Definitions of Terms Specific to This Standard:
3.1.1 air release time, n—the number of minutes needed for
air entrained in the oil to reduce in volume to 0.2 % under the
conditions of this test and at the specified temperature.
4. Summary of Test Method
4.1 Compressed air is blown through the test oil, which has
been heated to a temperature of 25, 50, or 75°C. After the airflow is stopped, the time required for the air entrained in the oil
to reduce in volume to 0.2 % is recorded as the air release time.
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