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.
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 18212;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 18212;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)nbsp;nbsp;nbsp; | Appendix X1 |
| Kinematic Viscosity | Test Method D445 |
| Acidity | Test Methods D664 and D974 |
| Pentane Insoluble | Test Method |
</li><li><a href='/5706726.html' target=_blank>ASTM D2270</a> Standard Practice for Calculating Viscosity Index From Kinematic Viscosity at 40 and 100176C</li><li><a href='/5721431.html' target=_blank>ASTM D2272</a> Standard Test Method for Oxidation Stability of Steam Turbine Oils by Rotating Pressure Vessel</li><li><a href='/5714291.html' target=_blank>ASTM D3120</a> Standard Test Method for Trace Quantities of Sulfur in Light Liquid Petroleum Hydrocarbons by Oxidative Microcoulometry</li><li><a href='/5729037.html' target=_blank>ASTM D3427</a> Standard Test Method for Air Release Properties of Petroleum Oils</li><li><a href='/5708916.html' target=_blank>ASTM D4304</a> Standard Specification for Mineral Lubricating Oil Used in Steam or Gas Turbines</li><li><a href='/5735413.html' target=_blank>ASTM D4310</a> Standard Test Method for Determination of the Sludging and Corrosion Tendencies of Inhibited Mineral Oils</li><li><a href='/5708577.html' target=_blank>ASTM D445</a> Standard Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (the Calculation of Dynamic Viscosity)</li><li><a href='/5701373.html' target=_blank>ASTM D5185</a> Standard Test Method for Determination of Additive Elements, Wear Metals, and Contaminants in Used Lubricating Oils and Determination of Selected Elements in Base Oils by Inductively Coupled Plasma Atomic Emission Spectrometry (ICP-AES)</li><li><a href='/5719073.html' target=_blank>ASTM D5846</a> Standard Test Method for Universal Oxidation Test for Hydraulic and Turbine Oils Using the Universal Oxidation Test Apparatus</li><li><a href='/5721830.html' target=_blank>ASTM D611</a> Standard Test Methods for Aniline Point and Mixed Aniline Point of Petroleum Products and Hydrocarbon Solvents</li><li><a href='/5713695.html' target=_blank>ASTM D6186</a> Standard Test Method for Oxidation Induction Time of Lubricating Oils by Pressure Differential Scanning Calorimetry (PDSC)</li><li><a href='/1606779246.html' target=_blank>ASTM D6304</a> Standard Test Method for Determination of Water in Petroleum Products, Lubricating Oils, and Additives by Coulometric Karl Fischer Titration</li><li><a href='/1444638185.html' target=_blank>ASTM D6514</a> Standard Test Method for High Temperature Universal Oxidation Test for Turbine Oils</li><li><a href='/5713606.html' target=_blank>ASTM D664</a> Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration</li><li><a href='/5723822.html' target=_blank>ASTM D665</a> Standard Test Method for Rust-Preventing Characteristics of Inhibited Mineral Oil in the Presence of Water</li><li><a href='/1708553816.html' target=_blank>ASTM D892</a> Standard Test Method for Foaming Characteristics of Lubricating Oils</li><li><a href='/5712383.html' target=_blank>ASTM D893</a> Standard Test Method for Insolubles In Used Lubricating Oils</li><li><a href='/5718888.html' target=_blank>ASTM D974</a> Standard Test Method for Acid and Base Number by Color-Indicator Titration</li> </ul>
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<h2 class='h4'>ASTM D7155-11 history</h2><ul><li><span class='label label-default'>2020</span> <a href='/2092897942.html' target=_blank>ASTM D7155-20</a> Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils</li><li><span class='label label-default'>2018</span> <a href='/1937421638.html' target=_blank>ASTM D7155-18</a> Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils</li><li><span class='label label-default'>2011</span> <a href='/6273828.html' target=_blank>ASTM D7155-11</a> Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils</li><li><span class='label label-default'>2006</span> <a href='/5723898.html' target=_blank>ASTM D7155-06</a> Standard Practice for Evaluating Compatibility of Mixtures of Turbine Lubricating Oils</li></ul> <!--History -->
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