ASTM_D_7918_-_15.pdf

Designation:D791815Standard Test Method forMeasurement of Flow Properties and Evaluation of Wear,Contaminants and Oxidative Properties of LubricatingGrease by Die Extrusion Method and Preparation1This standard is issued under the fixed designation D7918;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 test method covers the determination and evalua-tion of flow properties,wear levels,contaminants,and oxida-tive condition of new and in-service lubricating grease.1.2 This test method provides guidance on evaluating in-service grease samples,NLGI grades 00 to 3,for wear,consistency,contamination,and oxidation.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3.1 ExceptionThe exception to this will be where unitsof references were developed by the developers of the testequipment and necessary to report the results of the test.1.4 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.2.Referenced Documents2.1 ASTM Standards:2D217 Test Methods for Cone Penetration of LubricatingGreaseD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD6595 Test Method for Determination of Wear Metals andContaminants in Used Lubricating Oils or Used HydraulicFluids by Rotating Disc ElectrodeAtomic Emission Spec-trometryD7527 Test Method for Measurement of Antioxidant Con-tent in Lubricating Greases by Linear Sweep VoltammetryD7718 Practice for Obtaining In-Service Samples of Lubri-cating GreaseD7843 Test Method for Measurement of Lubricant Gener-ated Insoluble Color Bodies in In-Service Turbine Oilsusing Membrane Patch ColorimetryE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 active grease sampling device,ndevice designed totake an active sample of a lubricating grease from a bearing,gear,or drive shaft located in a grease lubricated component.D77183.1.1.1 DiscussionThe Grease Thief(trademarked)Type23is a tool which meets this description and can be used toobtain an active grease sample from a lubricated component.Afull description and dimensions of this device can be found inAnnex A2.3.1.2 active sampling,vto use a sampling device toactively gather an in-service lubricating grease sample from agrease-lubricated component.D77183.1.3 calibration,nthe determination of the values of thesignificant parameters by comparison with values indicated bya set of reference standards.D65953.1.4 consistency,nof lubricating grease,the degree ofresistance to movement under stress.D2171This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.96.07 on Integrated Testers,Instrumentation Techniques forIn-Service Lubricants.Current edition approved June 1,2015.Published June 2015.DOI:10.1520/D7918-15.2For 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.3The Grease Thief Type I and Type II is described in US Patent No.7984661.Interested parties are invited to submit information regarding the identification of analternative(s)to this patented item to the ASTM International Headquarters.Yourcomments will receive careful consideration at a meeting of the responsibletechnical committee,which you may attend.The sole source of the Grease ThiefType I and Type II are known to the committee is York Laboratories,LLC locatedat 410 Kings Mill Rd.,York,PA 17401.If you are aware of alternative suppliers,please provide this information to ASTM International Headquarters.Your com-ments will receive careful consideration at a meeting of the responsible technicalcommittee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.4.1 DiscussionThe term consistency is used somewhatsynonymously with penetration.Generally,consistency refersto the worked penetration of a grease.3.1.5 linear sweep voltammetry,na test method designedto monitor the anti-oxidant additive content in lubricatinggreases.D75273.1.6 lubricating grease,na semi-fluid to solid product ofdispersion of a thickener in a liquid lubricant.D2173.1.6.1 DiscussionThe dispersion of the thickener forms atwo-phase system and immo