ASTM_D_7155_-_20.pdf

Designation:D715520Standard 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.Scope*1.1 This practice covers the compatibility of mixtures ofturbine lubricating oils as defined by Specification D4304.Themethods compare properties of specific mixtures with those ofthe neat oils after storage at specified conditions.1.2 The methods are grouped into four tiers of testing types:1.2.1 Tier 1Visual appearance1.2.2 Tier 2Interfacial properties1.2.3 Tier 3Physical and chemical properties1.2.4 Tier 4Specific performance properties1.3 The 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 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.1.5 Mixtures of the two constituent oils are evaluated usingthe Tier 1 and Tier 2 testing protocol.Sequential or concurrenttesting is continued by applying tests from Tier 3 or Tier 4 untilthe test requestor or user is satisfied that the intent of thispractice has been met.If any mixture fails the methods,the oilsare considered incompatible by that method.If all mixturespass the methods,the oils are considered compatible by thosemethods.It is recommended that passing only Tier 1 does notadequately test for fluid compatibility.1.6 If the mixture passes Tier 1,it shows two oils arevisually compatible only.If the mixture passes Tier 1 and 2,itshows two oils are visually and interfacially compatible.If themixture passes Tier 1,2 and 3,it shows two oils are visually,interfacially,physically,and chemically compatible.If themixture passes Tier 1,2,3,4,it shows two oils are compatiblewith the highest confidence level.Testing each tier level isgiving the user more confidence that the two fluids arecompatible.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 for lubrication performance.Theuser is advised to consult with suppliers 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 asstandard.The values given in parentheses after SI units areprovided for information only and are not considered standard.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.12 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.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)1This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.C0.01 on Turbine Oil Monitoring,Problems and Systems.Current edition approved May 1,2020.Published June 2020.Originallyapproved in 2006.Last previous edition approved in 2018 as D7155 18.DOI:10.1520/D7155-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevel