ASTM_D_7155_-_11.pdf

Designation:D715511Standard Practice forEvaluating Compatibility of Mixtures of Turbine LubricatingOils1This standard is issued under the fixed designation D7155;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the compatibility of mixtures ofturbine lubricating oils of the same ISO VG grade and type asdefined by Specification D4304.The Tier 1 method comparesthe visual appearances of specific mixtures with those of theneat oils after storage at specified conditions.1.2 If the current in-service oil is causing problems or ifcircumstances indicate the need for additional testing,a Tier 2method compares selected performance properties of the mix-ture and its constituent oils.1.3 The Tier 1 and Tier 2 methods can be used to evaluatenew(unused)lubricant compatibility or the effects of addingnew(unused)lubricant to in-service lubricant in the system.1.4 This practice does not evaluate the wear preventioncharacteristics,load carrying capacity,or the mechanical shearstability of lubricants mixtures while in service.If anti-wear(AW),extreme pressure(EP),or shear stability are to beevaluated,further testing of these parameters may be required.1.4.1 Tier 1Mixtures of the two constituent oils to beevaluated are prepared at specified proportions,stored in anoven at 65C for 168 h,and then evaluated for changes inphysical appearance.1.4.2 Tier 1Mixtures of the two constituent oils to beevaluated are prepared at specified proportions,stored in anoven at 65C for 168 h,and then evaluated for changesphysical appearance and parameters detailed in 7.3.1.5 Mixtures of the two constituent oils are evaluated in aprimary testing protocol using the following standards:Appearance(Tier 1 and Tier 2)Appendix X1Kinematic ViscosityTest Method D445AcidityTest Methods D664 and D974Pentane InsolubleTest Method D893Copper CorrosionTest Method D130Rust PreventionTest Method D665Foaming CharacteristicsTest Method D892Air Release PropertiesTest Method D3427Water SeparabilityTest Method D1401Oxidation Stability TestNote 11.5.1 For compatible mixtures,a supplemental(nonmanda-tory)testing scheme is suggested when circumstances indicatethe need for additional testing the beyond Tier 2 primaryrecommended tests.NOTE1The oxidation stability test method should be selected basedon the product type and in agreement with the lubricant supplier(seeAppendix X2 for options).Unlike other tests described in this practice,theimpact on oxidation stability may not be easily interpreted with a pass/failrating.The user is encouraged to contact the lubricant supplier forassistance in the evaluation of the data.1.6 Sequential or concurrent testing is continued until thetest requestor or user is satisfied that the intent of this practicehas been met.If any mixture fails the Tier 1 visual appearancemethod or any of the Tier 2 primary tests,when requested,theoils are incompatible.If all mixtures pass the Tier 1 or Tier 2tests,the oils are considered compatible by those methods.1.7 This practice applies only to lubricating oils havingcharacteristics suitable for evaluation by the suggested testmethods.If the scope of a specific test method limits testing tothose oils within a specified range of properties,oils outsidethat range cannot be tested for compatibility by that testmethod.1.8 This practice may be used to evaluate the compatibilityof different types and grades of oil.However,it is not intendedto evaluate such mixtures.The user is advised to consult withsuppliers in these situations.1.9 This practice does not purport to cover all test methodsthat could be employed.1.10 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.11 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts and Lubricants and is the direct responsibility of Subcommittee D02.C0 onTurbine Oils.Current edition approved Oct.1,2011.Published November 2011.Originallyapproved in 2006.Last previous edition approved in 2006 as D715506.DOI:10.1520/D7155-11.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 2.Referenced Documents2.1 ASTM Standards:2D130 Test Method for Corrosiveness to Copper from Petro-leum Products by Copper Strip TestD445 Test Method for Kinematic Viscosity of Transparentand Opaque Liquids(and Calculation of Dynamic Viscos-ity)D611 Test Methods for Aniline Point and Mixed AnilinePoint of